Journal articles: 'RPET'

1

da Silva, Jhonny K. F., Bruna B. Sotomaior, Carolina F. Carneiro, Patrick Rodrigues, Lee Wharton, and Raul Osiecki. "Predicting Lactate Threshold With Rate of Perceived Exertion in Young Competitive Male Swimmers." Perceptual and Motor Skills 128, no. 4 (April 4, 2021): 1530–48. http://dx.doi.org/10.1177/00315125211005227.

Full text

Abstract:

The purpose of this study was to verify the effectiveness of the rate of perceived exertion threshold (RPET) for predicting young competitive swimmers’ lactate threshold (LT) during incremental testing. We enrolled 13 male athletes ( M age = 16, SD = 0.6 years) in an incremental test protocol consisting of eight repetitions of a 100-meter crawl with 2-minute intervals between each repetition. We collected data for blood lactate concentration ([La]) and Borg scale rate of perceived exertion (RPE) at the end of each repetition. The results obtained were: M RPET = 4.98, SD = 1.12 arbitrary units (A.U.) and M lactate threshold = 4.24, SD = 1.12 mmol.L−1, with [La] and RPE identified by the maximal deviation (Dmax) method without a significant difference ( p > 0.05) and large correlations between DmaxLa and DmaxRPE at variables for time (r = 0.64), velocity (r = 0.67) and percentage of personal best time (PB) (r = 0.60). These results suggest that RPET is a good predictor of LT in young competitive swimmers.

APA, Harvard, Vancouver, ISO, and other styles

2

Ghoshal, Rituparna, Sharanjeet Sharanjeet-Kaur, Norliza Mohamad Fadzil, Haliza Abdul Mutalib, Somnath Ghosh, Nor Fariza Ngah, and Roslin Azni Abd Aziz. "Correlation between Visual Functions and Retinal Morphology in Eyes with Early and Intermediate Age-Related Macular Degeneration." International Journal of Environmental Research and Public Health 17, no. 17 (September 2, 2020): 6379. http://dx.doi.org/10.3390/ijerph17176379.

Full text

Abstract:

In early and intermediate age related macular degeneration (ARMD), visual acuity alone has failed to explain the complete variation of vision. The aim of the present study was to determine correlation between different visual functions and retinal morphology in eyes with early and intermediate ARMD. In this single center cross sectional study, patients diagnosed as early or intermediate ARMD in at least one eye were recruited. Visual functions measured were best- corrected distance visual acuity (DVA), near vision acuity (NVA), reading speed (RS), and contrast sensitivity (CS). Parameters such as thickness (RT) and volume (RV) of the retina, outer retinal layer thickness (ORLT) and volume (ORLV), outer nuclear layer thickness (ONLT) and volume (ONLV), retinal pigment epithelium layer-Bruch’s membrane complex thickness (RPET) and volume (RPEV) were assessed employing semi-auto segmentation method of Spectralis optical coherence tomography (OCT). Twenty-six eyes were evaluated. DVA, CS, and RS showed significantly good correlation with RPET, ONLT, and ONLV, whereas NVA showed good correlation with ONLV and RPET. The present study concluded that RS, CS, NVA, and DVA represent the morphological alteration in early stages and should be tested in clinical settings. ONLT, ONLV, and RPET morphological parameters can be employed as important biomarkers in diagnosis of early to intermediate ARMD.

APA, Harvard, Vancouver, ISO, and other styles

3

Wu, Zhi Hao, Li Li Li, Shuai Shuai Jiang, Ze Xu Hu, Yu Chen Mao, and Mei Fang Zhu. "Preparation and Properties of Recycled-Polyester Nanocomposite Fibers Synergistic Modified with Phosphorus Containing Flame-Retardant and α-Zirconium Phosphate." Materials Science Forum 789 (April 2014): 174–77. http://dx.doi.org/10.4028/www.scientific.net/msf.789.174.

Full text

Abstract:

Recycled-polyester (RPET) was melt blended with the phosphorus-containing flame retardant (FRP) and α-zirconium phosphate (α-ZrP). The thermal properties of RPET/FRP/α-ZrP composites were analyzed. Modified RPET fibers were prepared through melt spinning of dried RPET nanocomposite chips. The mechanical properties and fire-retardant properties of RPET/FRP/α-ZrP fibers containing different α-ZrP contents were tested. The results show that the synergism of α-ZrP and FRP exerts a positive effect on the mechanical and the flame-retardant property of RPET, leading to nanocomposite fibers of 1.9cN/dtex and 31.6% limiting oxygen index (LOI) value.

APA, Harvard, Vancouver, ISO, and other styles

4

Loaeza, David, Jonathan Cailloux, Orlando Santana Pérez, Miguel Sánchez-Soto, and Maria Maspoch. "Impact of Titanium Dioxide in the Mechanical Recycling of Post-Consumer Polyethylene Terephthalate Bottle Waste: Tensile and Fracture Behavior." Polymers 13, no. 2 (January 19, 2021): 310. http://dx.doi.org/10.3390/polym13020310.

Full text

Abstract:

This work provides an experimental analysis regarding the fracture behavior of recycled opaque PET (rPET-O) containing titanium dioxide (TiO2) under plane stress conditions. For this purpose, a commercially post-consumer transparent colored/opaque PET flakes mix was processed using a semi-industrial extrusion calendering process. The manufactured rPET-O sheets had a TiO2 content of 1.45 wt.%. The mechanical and fracture properties of unaged and physically aged (1 year) samples were determined through uniaxial tensile experiments and the Essential Work of Fracture (EWF) methodology, respectively, and were compared to those of recycled transparent PET (rPET-T). Under tensile loading, independently of the aging time, rPET-O samples exhibited similar mechanical behavior as rPET-T up to the yield point. The main differences remained in the post-yielding region. The presence of TiO2 particles allowed reducing the strain energy density up to neck formation in aged samples. Regarding the EWF analysis, it is argued that the energy consumed up to the onset of crack propagation (we) for rPET-T was mainly dependent of the molecular mobility. That is, the we value decreased by 26% when rPET-T was physically aged. Interestingly, we values remained independent of the aging time for rPET-O. In fact, it was highlighted that before crack propagation, the EWF response was principally governed by matrix cavitation ahead of the crack tip, which allowed a significant release of the triaxial stress state independently of the molecular mobility. This property enabled rPET-O to exhibit a resistance to crack initiation 17% higher as compared to rPET-T when the material was physically aged. Finally, independently of the aging time, rPET-O exhibited a resistance to crack growth approximately 21% larger than rPET-T due to matrix fibrillation in large scale deformation.

APA, Harvard, Vancouver, ISO, and other styles

5

Taghavi, Sayed Kamal, Hamzeh Shahrajabian, and Hamid Mohammad Hosseini. "Detailed comparison of compatibilizers MAPE and SEBS-g-MA on the mechanical/thermal properties, and morphology in ternary blend of recycled PET/HDPE/MAPE and recycled PET/HDPE/SEBS-g-MA." Journal of Elastomers & Plastics 50, no. 1 (March 16, 2017): 13–35. http://dx.doi.org/10.1177/0095244317698738.

Full text

Abstract:

In this study, for recycling polyethylene terephthalate, a blend of recycled polyethylene terephthalate (RPET) and high-density polyethylene (HDPE) with maleic anhydride polyethylene (MAPE) and maleic anhydride-grafted styrene–ethylene/butylene–styrene (SEBS-g-MA) were used. The effect of compatibilizers in RPET was investigated by mechanical test (tensile and flexural tests), thermal test (differential scanning calorimetry (DSC)), and melt flow index test. The morphology of fracture surface of samples was investigated by scanning electron microscopy (SEM). The mechanical tests showed that elongation at break point and the fracture energy of samples with composition of RPET (70 wt%)/HDPE (15 wt%)/MAPE (15 wt%) and RPET (75 wt%)/HDPE (10 wt%)/SEBS-g-MA (15 wt%) increased significantly. Results of DSC test and SEM photography showed that ternary blend of RPET/HDPE/MAPE has better compatibility compared with RPET/HDPE/SEBS-g-MA. SEM images showed that MAPE provides better bonding between RPET and HDPE compared with SEBS-g-MA. MAPE was dispersed in RPET better than SEBS-g-MA.

APA, Harvard, Vancouver, ISO, and other styles

6

Khan, Zahid Iqbal, Zurina Binti Mohamad, Abdul Razak Bin Rahmat, Unsia Habib, and Nur Amira Sahirah Binti Abdullah. "A novel recycled polyethylene terephthalate/polyamide 11 (rPET/PA11) thermoplastic blend." Progress in Rubber, Plastics and Recycling Technology 37, no. 3 (March 15, 2021): 233–44. http://dx.doi.org/10.1177/14777606211001074.

Full text

Abstract:

This work explores a novel blend of recycled polyethylene terephthalate/polyamide 11 (rPET/PA11). The blend of rPET/PA11 was introduced to enhance the mechanical properties of rPET at various ratios. The work’s main advantage was to utilize rPET in thermoplastic form for various applications. Three different ratios, i.e. 10, 20 and 30 wt.% of PA11 blend samples, were prepared using a twin-screw extruder and injection moulding machine. The mechanical properties were examined in terms of tensile, flexural and impact strength. The tensile strength of rPET was improved more than 50%, while the increase in tensile strain was observed 42.5% with the addition of 20 wt.% of PA11. The improved properties of the blend were also confirmed by the flexural strength of the blends. The flexural strength was increased from 27.9 MPa to 48 MPa with the addition of 30 wt.% PA11. The flexural strain of rPET was found to be 1.1%. However, with the addition of 10, 20 and 30 wt.% of PA11, the flexural strain was noticed as 1.7, 2.1, and 3.9% respectively. The impact strength of rPET/PA11 at 20 wt.% PA11 was upsurged from 110.53 to 147.12 J/m. Scanning electron microscopy analysis revealed a dispersed PA11 domain in a continuous rPET matrix morphology of the blends. This work practical implication would lead to utilization of rPET in automobile, packaging, and various industries.

APA, Harvard, Vancouver, ISO, and other styles

7

Negoro, Takanori, Rutchaneekorn Wongpajan, Wiranphat Thodsaratpreeyakul, Jitlada Boonlertsamut, Supaphorn Thumsorn, Hiroyuki Inoya, and Hiroyuki Hamada. "Optimizing of vented injection molding on mechanical performance and miscibility of recycled poly(ethylene terephthalate) and polycarbonate blends." Journal of Polymer Engineering 37, no. 3 (March 1, 2017): 271–77. http://dx.doi.org/10.1515/polyeng-2016-0034.

Full text

Abstract:

Abstract Blending of recycled poly(ethylene terephthalate) (RPET) and polycarbonate (PC) was performed by melt compounding. The blends were subsequently fabricated to dumbbell specimens by vented injection molding. The mechanical properties, thermal characteristic and morphology of RPET/PC blends were investigated as a function of PC contents. Vented injection molding presented an advantage for superior mechanical properties of RPET/PC blends. The addition of PC enhanced impact strength and fracture toughness with remaining tensile properties. The glass transition temperatures of PET and PC shifted toward each other, which indicated their partial miscibility of RPET and PC in the blends. The toughness mechanism of RPET and PC was related to core-shell structure and good interfacial adhesion at higher contents of PC.

APA, Harvard, Vancouver, ISO, and other styles

8

Pinter, Elisabeth, Frank Welle, Elisa Mayrhofer, Andreas Pechhacker, Lukas Motloch, Vera Lahme, Andy Grant, and Manfred Tacker. "Circularity Study on PET Bottle-To-Bottle Recycling." Sustainability 13, no. 13 (July 1, 2021): 7370. http://dx.doi.org/10.3390/su13137370.

Full text

Abstract:

With the European Green Deal, the importance of recycled products and materials has increased. Specifically, for PET bottles, a high content of recycled material (rPET) is demanded by the industry and consumers. This study was carried out in a lab environment replicating real-life industrial processes, to investigate the possible impacts on rPET quality over eleven recycling loops, aiming to use high amounts of rPET repetitively. A cycle included extrusion, solid state polycondensation (SSP), a second extrusion to simulate bottle production, hot wash and a drying step. 75% rPET and 25% virgin PET were extruded in eleven cycles to simulate a recycling and production process. Samples underwent chemical, physical and biological analysis. The quality of the rPET material was not adversely affected. Parameters such as coloring, intrinsic viscosity, concentration of critical chemicals and presence of mutagenic contaminants could be positively assessed. The quality of the produced material was likely influenced by the input material’s high standard. A closed loop PET bottle recycling process using an rPET content of up to 75% was possible when following the proposed process, indicating that this level of recycled content can be maintained indefinitely without compromising quality.

APA, Harvard, Vancouver, ISO, and other styles

9

Dominici, Franco, Fabrizio Sarasini, Francesca Luzi, Luigi Torre, and Debora Puglia. "Thermomechanical and Morphological Properties of Poly(ethylene terephthalate)/Anhydrous Calcium Terephthalate Nanocomposites." Polymers 12, no. 2 (January 30, 2020): 276. http://dx.doi.org/10.3390/polym12020276.

Full text

Abstract:

Calcium terephthalate anhydrous salts (CATAS), synthetized by reaction of terephthalic acid with metal (Ca) oxide were incorporated at different weight contents (0–30 wt. %) in recycled Poly(ethylene terephthalate) (rPET) by melt processing. Their structure, morphology, thermal and mechanical properties (tensile and flexural behavior) were investigated. Results of tensile strength of the different formulations showed that when the CATAS content increased from 0.1 to 0.4 wt. %, tangible changes were observed (variation of tensile strength from 65.5 to 69.4 MPa, increasing value for E from 2887 up to 3131 MPa, respectively for neat rPET and rPET_0.4CATAS). A threshold weight amount (0.4 wt. %) of CATAS was also found, by formation at low loading, of a rigid amorphous fraction at the rPET/CATAS interface, due to the aromatic interactions (π−π conjugation) between the matrix and the filler. Above the threshold, a restriction of rPET/CATAS molecular chains mobility was detected, due to the formation of hybrid mechanical percolation networks. Additionally, enhanced thermal stability of CATAS filled rPET was registered at high content (Tmax shift from 426 to 441 °C, respectively, for rPET and rPET_30CATAS), essentially due to chemical compatibility between terephthalate salts and polymer molecules, rich in stable aromatic rings. The singularity of a cold crystallization event, identified at the same loading level, confirmed the presence of an equilibrium state between nucleation and blocking effect of amorphous phase, basically related to the characteristic common terephthalate structure of synthetized Ca–Metal Organic Framework and the rPET matrix.

APA, Harvard, Vancouver, ISO, and other styles

10

Salleh, Mohd Nazry, Ruey Shan Chen, Mohd Hafizuddin Ab Ghani, Farizul Hafiz Kasim, and Ahmad Sahrim. "Preparation and Characterization of High-Density Polyethylene Blends and Recycled Poly(ethylene terephthalate)." Applied Mechanics and Materials 695 (November 2014): 131–34. http://dx.doi.org/10.4028/www.scientific.net/amm.695.131.

Full text

Abstract:

Polymer blends based on recycled high density polyethylene (rHDPE) and recycled poly (ethylene terephthalate) (rPET) with two types of ethylene-glycidyl methacrylate copolymer (E-GMA), Lotader AX8840 and Lotader AX8900 as compatibilizer were produced in a co-rotating twin screw extruder. The effects of adding rPET content on the impact properties of rHDPE-rich blends were also investigated. The result showed an enhancement of about 80-270% in impact properties as compared to those of the Lotader AX8900. The impact strength also showed a decreasing trend as the rPET content was increased. The addition of E-GMA to the rHDPE/rPET blends was found to recover the blend toughness as well as improving the compatibility between HDPE and PET. In this study, the highest result was obtained for the rHDPE/rPET blends using Lotader AX8840 composition with 7.5% E-GMA content. FTIR analysis of the compatibilized blends confirmed the chemical interaction and improved interfacial bonding between the two phases.

APA, Harvard, Vancouver, ISO, and other styles

11

Hongsriphan, Nattakarn, Supakorn Samangain, Yuttanawee Siriteeraphan, and Nattakarn Yangcheepyuenyoodee. "Poly(Butylene Succinate) and Recycled Poly(Ethylene Terephthalate) Blends Adding GMA as Compatibilizer: Mechanical Properties and Chemical Resistance to Household Chemicals." Key Engineering Materials 798 (April 2019): 291–97. http://dx.doi.org/10.4028/www.scientific.net/kem.798.291.

Full text

Abstract:

Recycled poly(ethylene terephthalate) (rPET) from post-consumer drinking bottles was added into poly(butylene succinate) (PBS), which aimed to improve chemical resistance and also reduce cost. PBS and rPET with the weight ratios of 100/0, 90/10, 80/20, 70/30, 60/40, and 50/50 wt% were melt blended using glycidyl methacrylate (GMA) of 0, 3, and 5 phr as a compatibilizer and dicumyl peroxide (DCP) of 0.5 phr as an initiator. It was found that increasing rPET content enhanced Young’s modulus of the blends. However, tensile strength, and elongation at break of the blends were reduced due to phase separation. Incorporating GMA improved chemical compatibility resulting the PBS/rPET blends to have higher tensile strength and elongation at break. Compared to pure PBS, blending rPET improved chemical resistance to household chemicals such as bathroom cleaning liquid (hydrochloric acid based) and bleaching liquid, which the blends adding GMA showed even better chemical resistance.

APA, Harvard, Vancouver, ISO, and other styles

12

Srithep, Yottha, and Lih-Sheng Turng. "Microcellular injection molding of recycled poly(ethylene terephthalate) blends with chain extenders and nanoclay." Journal of Polymer Engineering 34, no. 1 (February 1, 2014): 5–13. http://dx.doi.org/10.1515/polyeng-2013-0143.

Full text

Abstract:

Abstract Poly(ethylene terephthalate) (PET) resin is one of the most widely used thermoplastics, especially in packaging. Due to thermal and hydrolytic degradations, recycled PET (RPET) exhibits poor mechanical properties and lacks moldability. The effects of adding chain extender (CE) and nanoclay to RPET were investigated. Melt blending of RPET with CE was performed in a thermokinetic mixer (K-mixer). The blended materials were then prepared via solid and microcellular injection molding processes. The effects of CE loading levels and the simultaneous addition of nanoclay on the thermal and mechanical properties and cell morphology of the microcellular components were noted. The addition of 1.3% CE enhanced the tensile properties and viscosity of RPET. The higher amount of CE (at 3%) enhanced the viscosity, but the margin of improvement in mechanical properties diminished. While the solid RPET and CE blends were fairly ductile, the samples with nanoclay and all microcellular specimens showed brittle fractural behavior. Finally, nanoclay and the increase of CE content decreased the average cell size and enlarged the cell density of the microcellular samples.

APA, Harvard, Vancouver, ISO, and other styles

13

Potiyaraj, Pranut, Supachok Tanpichai, and Prompoom Phanwiroj. "Physical Properties of PP/Recycled PET Blends Prepared by Pulverization Technique." Advanced Materials Research 488-489 (March 2012): 109–13. http://dx.doi.org/10.4028/www.scientific.net/amr.488-489.109.

Full text

Abstract:

Polymer blends between pristine polypropylene (PP) and post-consumer soft-drink PET bottles (rPET) were prepared using pulverization technique. The polymer mixtures were pulverized, at the amounts of rPET in PP of 0, 10, 15, 20 and 30 phr (parts per hundred of resin) by weight, into powder. In an extruder, the polymer powders were mixed with maleic anhydride-grafted polypropylene (MAPP) and polyethylene wax (PE wax) as a compatibilizer and a processing aid, respectively. The extrudates were prepared into test specimens by injection molding. Physical properties of PP/rPET blends were subsequently investigated. The results pointed out that, for the pulverized blends without compatibilizer, tensile and flexural strength were improved at the lower amount of rPET. The compatibilizing effect of MAPP was exhibited at the higher amount of rPET. The reduction of melt flow index (MFI) may cause difficulties for some processing techniques which required polymers with high MFI. The addition of PE wax successfully brought up the MFI as well as elongation at break while other mechanical properties decreased.

APA, Harvard, Vancouver, ISO, and other styles

14

Lin, Jia Horng, Wen Hao Hsing, Yu Chun Chuang, Ting Ting Li, Hsueh Jen Tan, and Ching Wen Lou. "Optimization Process and Characteristic Evaluations of Pro-Environmental Recycled PET Composite Geotextiles." Advanced Materials Research 627 (December 2012): 737–40. http://dx.doi.org/10.4028/www.scientific.net/amr.627.737.

Full text

Abstract:

Recently environmental protection have been responded to by people. In this experiment, nonwoven selvages were smashed and then secondary used to prepare water-retaining geotextiles for achieving recovery effect. The geotextiles consisted of 6D recycled high-strength PET (RPET) fibers taken from nonwoven selvages. The RPET composite geotextiles were prepared after the 1000 D high-strength PET was blended with different ratios of the RPET fibers. Afterwards, their busting strength, air permeability and porosity were mainly discussed to acquire the best blending ratio. The result shows that, the bursting strength is reinforced but the air permeability is decreased with addition of high-strength PET. The optimal blending ratio of 1000 D high-strength PET and 6D RPET is 40 %/60 % on account of comparison with strength of commercially available geotextiles.

APA, Harvard, Vancouver, ISO, and other styles

15

Little, Helen A., Nagendra G. Tanikella, Matthew J. Reich, Matthew J. Fiedler, Samantha L. Snabes, and Joshua M. Pearce. "Towards Distributed Recycling with Additive Manufacturing of PET Flake Feedstocks." Materials 13, no. 19 (September 25, 2020): 4273. http://dx.doi.org/10.3390/ma13194273.

Full text

Abstract:

This study explores the potential to reach a circular economy for post-consumer Recycled Polyethylene Terephthalate (rPET) packaging and bottles by using it as a Distributed Recycling for Additive Manufacturing (DRAM) feedstock. Specifically, for the first time, rPET water bottle flake is processed using only an open source toolchain with Fused Particle Fabrication (FPF) or Fused Granular Fabrication (FGF) processing rather than first converting it to filament. In this study, first the impact of granulation, sifting, and heating (and their sequential combination) is quantified on the shape and size distribution of the rPET flakes. Then 3D printing tests were performed on the rPET flake with two different feed systems: an external feeder and feed tube augmented with a motorized auger screw, and an extruder-mounted hopper that enables direct 3D printing. Two Gigabot X machines were used, each with the different feed systems, and one without and the latter with extended part cooling. 3D print settings were optimized based on thermal characterization, and both systems were shown to 3D print rPET directly from shredded water bottles. Mechanical testing showed the importance of isolating rPET from moisture and that geometry was important for uniform extrusion. The mechanical strength of 3D-printed parts with FPF and inconsistent flow is lower than optimized fused filament, but adequate for a wide range of applications. Future work is needed to improve consistency and enable water bottles to be used as a widespread DRAM feedstock.

APA, Harvard, Vancouver, ISO, and other styles

16

Rosnan, Rizuan Mohd, and Agus Arsad. "Effect of MMT concentrations as reinforcement on the properties of recycled PET/HDPE nanocomposites." Journal of Polymer Engineering 33, no. 7 (October 1, 2013): 615–23. http://dx.doi.org/10.1515/polyeng-2013-0107.

Full text

Abstract:

Abstract The objective of this research is to investigate the effect of incorporating montmorillonite (MMT) on the mechanical, morphological, rheological, and thermal properties of recycled poly(ethylene terephthalate) (rPET) and high-density polyethylene (HDPE) nanocomposites. The MMT contents in 90:10 rPET/HDPE and 70:30 rPET/HDPE ranged from 1 to 5 wt.%. rPET/HDPE nanocomposites were prepared by using a single screw extruder, and injection molded to prepare mechanical test specimens. The samples underwent rheological tests by using a capillary rheometer, and the morphology of the nanocomposites was investigated by scanning electron microscopy (SEM). The thermal stability of the nanocomposites was tested using thermogravimetric analysis (TGA). The results showed that MMT acts as compatibilizing agent and improves phase dispersion and interfacial adhesion in the nanocomposites. The maximum tensile strength was found at 3 and 1 wt.% of MMT for the 90:10 and 70:30 rPET/HDPE blends. However, the tensile modulus decreased significantly with the incorporation of MMT. The impact strength for both the 90:10 and 70:30 blends reached a maximum at 3 wt.% and started to decrease beyond 3 wt.%. The incorporation of MMT increased the shear viscosity of the 90:10 and 70:30 blends, which reached a maximum value at 3 and 1 wt.%. SEM micrographs showed a good interaction of MMT that improved the adhesion between the two phases of blends and led to an increase in the mechanical properties of rPET/HDPE nanocomposites.

APA, Harvard, Vancouver, ISO, and other styles

17

Siriorn, Isarankura Na Ayutthaya, Bunyarak Munchumart, Boondeacha Natanicha, Sangrawee Nut, Markmee Nopparat, and Haaian Suchart. "Viscosity improvement of recycled poly (ethylene terephthalate) from waste bottles by adding antioxidants and chain-extender." E3S Web of Conferences 302 (2021): 02019. http://dx.doi.org/10.1051/e3sconf/202130202019.

Full text

Abstract:

This research work is focused on the viscosity improvement of recycled poly(ethylene terephthalate) (rPET) from waste bottles by adding antioxidants and multi-functional reactive polymer (Joncry ADR 4468, chain extender). The achieve the objective of this work the investigated was broken into two parts. The first part studied the effect of rPET viscosity after adding various types of antioxidants and stabilizer such as Irgafos®168, Tinuvin® 770, Irganox®1010. The second part observed the effect of viscosity after it was blended with chain extender at 0, 0.2, 0.4, 0.6 and 0.8 pph. rPET was then dried in the oven at 120 oC for 12 hrs, to deplete the moisture. Then, the dried rPET (mixed with the chemicals above) was extruded into a compound using a twin screw extruder. The shear viscosity of the extruded compound was then measured using a rotational rheometer at 270 oC. The results revealed that the addition of chain extender increased the shear viscosity and the tensile strength at break of rPET. Therefore, the chain extender interacted with chains, which could change the structure to be the longer chains, branching or network structures. These structures are entangled and interrupt the movement of the molecular chains. It can be concluded that the viscosity of rPET can be improved by adding a chain extender at 0.6 pph, and the antioxidants of Irgafos®168, Tinuvin®770 and Irganox®1010 at 0.2, 0.1 and 0.5 pph, respectively.

APA, Harvard, Vancouver, ISO, and other styles

18

Shi, Guang, Li Jun He, Chu Zhi Chen, Jian Fu Liu, Qin Zhong Liu, and Hong Yu Chen. "A Novel Nanocomposite Based on Recycled Poly(Ethylene Terephthalate)/ABS Blends and Nano-SiO₂." Advanced Materials Research 150-151 (October 2010): 857–60. http://dx.doi.org/10.4028/www.scientific.net/amr.150-151.857.

Full text

Abstract:

Recycled PET is an important resource of waste, which reused with polar or crystallization polymers, such as PC, PA and PE, by melting blend method have been well studied. But the study of rPET blend with nonpolar and amorphous polymer is still inadequate. In the present work, nano-SiO2 particles were introduced to recycled PET/ABS/AES (55/40/5) blends by extrusion processing. It has been investigated how nano-SiO2 particles influences the morphology and mechanical properties of rPET/ABS blends by the use of AES as compatibilizer. It showed a uniform dispersion of the nano-SiO2 components, and the two-continuous phase of rPET/ABS was more evenly when the content of nano-SiO2 particles at a low level. The tensile strength and beam impact strength of rPET/ABS/AES blends were increased at the same time by adding nano-SiO2 particles..

APA, Harvard, Vancouver, ISO, and other styles

19

Kayaisang, Supattra, Taweechai Amornsakchai, and Sunan Saikrasun. "Potential utilization of recycled PET in comparison with liquid crystalline polymer as an additive for HDPE based composite fibers: Comparative investigation on mechanical performance of cross-ply laminates." Journal of Polymer Engineering 33, no. 9 (December 1, 2013): 793–802. http://dx.doi.org/10.1515/polyeng-2013-0155.

Full text

Abstract:

Abstract Recycled polyethylene terephthalate (rPET) was used as an alternative reinforcing material for in situ microfibrillar-reinforced polyethylene (PE) based composite fibers and compared with liquid crystalline polymer (LCP). The neat PE and its composites reinforced with LCP and rPET microfibrils under the compatibilizing promotion of 5 wt% styrene-(ethylene butylene)-styrene-grafted maleic anhydride (SEBS-g-MA) compatibilizer, were prepared as fibers using a hot drawing process. Cross-ply laminates of the neat PE and the compatibilized composite fibers were then prepared using a film stacking method. The tensile, flexural and impact performances of each laminate system were examined and compared. Under tensile loading, no significant differences in the initial part of the stress-strain curves, and hence comparable tensile modulus (≈4 GPa) among all laminates, were observed. A difference was only seen in the final part of the curves. For flexural properties, the flexural moduli of the compatibilized LCP- and rPET-composite laminates were nearly the same (≈3 GPa). At high flexural strains (>1%), the different stress-strain behaviors of the laminates were clearly observed. Interestingly, the compatibilized rPET-composite laminate showed much better impact-resistance compared with PE- and compatibilized LCP-laminates. The results demonstrated a high potential for use of the rPET-composite fiber laminate in impact-resistant applications.

APA, Harvard, Vancouver, ISO, and other styles

20

Loaeza, David, Jonathan Cailloux, Orlando Santana Pérez, Miguel Sánchez-Soto, and Maria Lluïsa Maspoch. "Extruded-Calendered Sheets of Fully Recycled PP/Opaque PET Blends: Mechanical and Fracture Behaviour." Polymers 13, no. 14 (July 19, 2021): 2360. http://dx.doi.org/10.3390/polym13142360.

Full text

Abstract:

This work presents the experimental results of the mechanical and fracture behaviour of three polymeric blends prepared from two recycled plastics, namely polypropylene and opaque poly (ethylene terephthalate), where the second one acted as a reinforcement phase. The raw materials were two commercial degrees of recycled post-consumer waste, i.e., rPP and rPET-O. Sheets were manufactured by a semi-industrial extrusion-calendering process. The mechanical and fracture behaviours of manufactured sheets were analyzed via tensile tests and the essential work of fracture approach. SEM micrographics of cryofractured sheets revelated the development of in situ rPP/rPET-O microfibrillar composites when 30 wt.% of rPET-O was added. It was observed that the yield stress was not affected with the addition of rPET-O. However, the microfibrillar structure increased the Young’s modulus by more than a third compared with rPP, fulfilling the longitudinal value predicted by the additive rule of mixtures. Regarding the EWF analysis, the resistance to crack initiation was highly influenced by the resistance to its propagation owing to morphology-related instabilities during tearing. To analyze the initiation stage, a partition energy method was successfully applied by splitting the total work of fracture into two specific energetic contributions, namely initiation and propagation. The results revelated that the specific essential initiation-related work of fracture was mainly affected by rPET-O phase. Remarkably, its value was significantly improved by a factor of three with the microfibrillar structure of rPET-O phase. The results allowed the exploration of the potential ability of manufacturing in situ MFCs without a “precursor” morphology, providing an economical way to promote the recycling rate of PET-O, as this material is being discarded from current recycling processes.

APA, Harvard, Vancouver, ISO, and other styles

21

Rigail-Cedeño, Andres F., Antonio Diaz-Barrios, Juan Gallardo-Bastidas, Stefania Ullaguari-Loor, and Nicolás Morales-Fuentes. "Recycled HDPE/PET Clay Nanocomposites." Key Engineering Materials 821 (September 2019): 67–73. http://dx.doi.org/10.4028/www.scientific.net/kem.821.67.

Full text

Abstract:

Recycling waste plastics will support the preservation of natural resources and energy consumption. New challenges arise for the development of products that take advantage of solid waste. Upgrading recycled plastics using nanotechnology can tailor and consequently improve plastic properties for industrial applications. This research aims to process and relate the morphology and thermo-mechanical properties of recycled high-density polyethylene (rHDPE) and recycled polyethylene terephthalate (rPET) clay nanocomposites. Blends of rHDPE (75 wt %) coming from packaging and rPET (25 wt %) from bottles were mixed with two organoclays (Cloisite 20A and Cloisite 30B) (3 wt %) and a compatibilizer agent based on ethylene-glycidyl methacrylate (EGMA) (5 wt %). The recycled plastics nanocomposites were processed using a single-screw extruder incorporating a dispersive and distributive mixer and an injection molding machine. Several techniques were used to characterize the dispersion, morphology, mechanical properties and compatibilization of these composite blends. The reinforcing effect of rPET in the continuous rHDPE phase depended on the organoclay type and the compatibilizer additive. Both organoclays increased the stiffness and strength of rHDPE and rPET as evidenced by an increase in the corresponding Young modulus and ultimate tensile strength. EGMA increased the compatibility in the recycle plastics blend and in the clays nanocomposites as evidenced in elongation and energy at break results. On the other side, Cloisite 20A showed to be more compatible with EGMA than Cloisite 30B in these rHDPE/rPET blends based on the thermo-mechanical properties results.

APA, Harvard, Vancouver, ISO, and other styles

22

Szabó, Veronika Anna, and Gábor Dogossy. "Investigation of Flame Retardant rPET Foam." Periodica Polytechnica Mechanical Engineering 64, no. 1 (October 11, 2019): 81–87. http://dx.doi.org/10.3311/ppme.14556.

Full text

Abstract:

The use of plastics in the food and the packaging industries continuously is increasing. In these areas of use the product’s life cycle is short, therefore it quickly turns into waste. The polyethylene terephthalate (PET) - the material that is used as beverage containers - are the material with the greatest environmental load. The physical recycling of PET bottles in large quantities was the research goal. During the work with the help of chemical foaming a closed cell structural foam from PET bottle was produced. The research was carried out with upcycling using chain extender and impact modifier additives. For industrial use a bromine-based flame retardant was used and excellent flame retardancy was achieved. Based on the results obtained, the material previously managed as waste, with the appropriate treatment can be involved into the manufacturing of new products.

APA, Harvard, Vancouver, ISO, and other styles

23

Geiger, Michaela. "Von Grönland inspiriertes Flaschenkonzept aus rPET." PACKaktuell 38, no. 5 (2021): 19. http://dx.doi.org/10.51202/1664-6533-2021-5-019-2.

Full text

APA, Harvard, Vancouver, ISO, and other styles

24

Atakan, Raziye, Serdar Sezer, and Hale Karakas. "Development of nonwoven automotive carpets made of recycled PET fibers with improved abrasion resistance." Journal of Industrial Textiles 49, no. 7 (September 7, 2018): 835–57. http://dx.doi.org/10.1177/1528083718798637.

Full text

Abstract:

In this study, velour design molded automotive carpets made of recycled polyethylene terephthalate (PET) fibers were developed via needle-punching process to improve their abrasion resistance properties. Initially, virgin PET fibers and recycled PET (rPET) fibers derived from PET bottle wastes were supplied from different producers and they were tested in terms of their fiber properties such as fiber length, crimp, tensile strength, elongation, tenacity, and intrinsic viscosity. It was demonstrated that recycled fibers from bottle wastes used in the study have lower tenacity and higher elongation than virgin PET fibers. In the second part, rPET fibers to be used in manufacturing in terms of their desired properties were selected. Subsequently, molded automotive carpets were produced from the selected rPET fibers and virgin PET fiber blends with adjusted manufacturing and molding parameters. Developed carpets were tested for abrasion resistance performance and they were evaluated according to requested specification. Results showed that carpets made of 85% rPET + 15% bicomponent PET had almost equal performance in terms of both fiber loss and carpet appearances with carpets consisting of 80% PET + 20% bicomponent PET. Carpets made of recycled PET fibers offer the manufacturer low raw material costs in addition to ecological advantages.

APA, Harvard, Vancouver, ISO, and other styles

25

Merijs Meri, Remo, Janis Zicans, Tatjana Ivanova, Rita Berzina, Guntis Japins, and Janis Locs. "Structure and Properties of Recycled Aromatic Thermoplastic Polyester Nanocomposites." Key Engineering Materials 527 (November 2012): 44–49. http://dx.doi.org/10.4028/www.scientific.net/kem.527.44.

Full text

Abstract:

Structure as well as mechanical and thermal properties of the nanocomposites based on recycled polyethylene terephthalate (RPET) are investigated. 1, 2 and 5 wt. % of unmodified montmorillonite nanoclay (MMT) were introduced in the RPET matrix by melt compounding in a twin screw extruder. Results of the investigations testify that optimum content of MMT for modification of RPET is between 1 and 2 wt. %. Up to this nanofiller weight content, the most rapid increase of stiffness, strength and impact toughness is observed. Besides it, at this nanofiller weight content the investigated composite have somewhat improved thermal resistance. It is demonstrated that the improvement of these properties is due to better distribution of MMT in the polymer matrix. At higher nanofiller content, the undesirable effects of the nanofiller agglomeration becomes more important.

APA, Harvard, Vancouver, ISO, and other styles

26

Kaymakci, Orkun, and Nurseli Uyanik. "In-situ Microfibrillar Recycled PET/Glass Fiber/PP Hybrid Thermoplastic Composites." Materiale Plastice 57, no. 4 (January 6, 2021): 309–16. http://dx.doi.org/10.37358/mp.20.4.5429.

Full text

Abstract:

Hybrid composites of in-situ microfibrillar recycled polyethylene terephthalate (rPET)/glass fiber (GF)/polypropylene (PP) were developed as an economical and environmentally friendly alternative to glass fiber reinforced thermoplastic PP composites. The effect of replacing glass fibers with in-situ formed polymer microfibrils on mechanical and viscoelastic properties of the composites was investigated with tensile, flexural, and dynamic mechanical tests. Characterization results showed that mechanical and viscoelastic performance of 34% glass fiber reinforced PP can be obtained with 24% glass fiber, 10% microfibrillar rPET composites. Compatibilization effect of the maleic anhydride grafted PP (MA-g-PP) was studied using Fourier transform infrared (FTIR) spectroscopy. The scanning electron microscopy (SEM) images confirmed the formation of the rPET microfibrils in the hybrid matrix. Besides, composites with MA-g-PP compatibilizers showed significantly improved fiber-matrix interfacial adhesion on the SEM images.

APA, Harvard, Vancouver, ISO, and other styles

27

Välimäki, Marja K., Laura I. Sokka, Heidi B. Peltola, Sami S. Ihme, Teijo M. J. Rokkonen, Timo J. Kurkela, Jyrki T. Ollila, Arttu T. Korhonen, and Jukka T. Hast. "Printed and hybrid integrated electronics using bio-based and recycled materials—increasing sustainability with greener materials and technologies." International Journal of Advanced Manufacturing Technology 111, no. 1-2 (September 26, 2020): 325–39. http://dx.doi.org/10.1007/s00170-020-06029-8.

Full text

Abstract:

Abstract Printed and hybrid integrated electronics produced from recycled and renewable materials can reduce the depletion of limited material resources while obtaining energy savings in small electronic applications and their energy storage. In this work, bio-based poly(lactic acid) (PLA) and recycled polyethylene terephthalate (rPET) were fabricated in film extrusion process and utilized as a substrate in ultra-thin organic photovoltaics (OPV). In the device structure, metals and metal oxides were replaced by printing PEDOT:PSS, carbon and amino acid/heterocycles. Scalable, energy-efficient fabrication of solar cells resulted in efficiencies up to 6.9% under indoor light. Furthermore, virgin-PET was replaced with PLA and rPET in printed and hybrid integrated electronics where surface-mount devices (SMD) were die-bonded onto silver-printed PLA and virgin-PET films to prepare LED foils followed by an overmoulding process using the rPET and PLA. As a result, higher relative adhesion of PLA-PLA interface was obtained in comparison with rPET-PET interface. The obtained results are encouraging from the point of utilization of scalable manufacturing technologies and natural/recycled materials in printed and hybrid integrated electronics. Assessment showed a considerable decrease in carbon footprint, about 10–85%, mainly achieved through replacing of silver, virgin-PET and modifying solar cell structure. In outdoor light, the materials with low carbon footprint can decrease energy payback times (EPBT) from ca. 250 days to under 10 days. In indoor energy harvesting, it is possible to achieve EPBT of less than 1 year. The structures produced and studied herein have a high potential of providing sustainable energy solutions for example in IoT-related technologies.

APA, Harvard, Vancouver, ISO, and other styles

28

Lin, Jia Horng, Ying Huei Shih, Ching Wen Lin, and Ching Wen Lou. "Nonwoven Fabrics Made by Using Recycled Polyester Fiber to Reinforce Low-Melting-Point Polylactide: Processing Technique and Property Evaluation." Advanced Materials Research 910 (March 2014): 230–33. http://dx.doi.org/10.4028/www.scientific.net/amr.910.230.

Full text

Abstract:

Polymeric material, which is commonly used in packaging, has been widely applied due to the fact that it is lightweight and chemical resistant. Being non-degradable, polymeric waste can thus only be eliminated by burning, and subsequently, there is a rising need for degradable polymeric material to manage this manner of disposal. This study thus uses degradable, low-melting-point polylactide (LMPLA) fibers and recycled polyester (RPET) fibers to make nonwoven fabrics for packaging. The tensile strength, tear strength, and air permeability of the nonwoven fabrics are then tested. The experiment results show that a 40% of RPET fibers can effectively promote the mechanical properties of the LMPLA nonwoven fabrics.

APA, Harvard, Vancouver, ISO, and other styles

29

Fang, Changqing, Rong Yang, Zisen Zhang, Xing Zhou, Wanqing Lei, Youliang Cheng, Wei Zhang, and Dong Wang. "Effect of multi-walled carbon nanotubes on the physical properties and crystallisation of recycled PET/TPU composites." RSC Advances 8, no. 16 (2018): 8920–28. http://dx.doi.org/10.1039/c7ra13634j.

Full text

APA, Harvard, Vancouver, ISO, and other styles

30

Lee, Dai Soo, Soo Hyoung Lee, and Ju Hyun Kim. "Curing behaviour of unsaturated polyester resins based on recycled poly(ethylene terephthalate) (RPET): effects of RPET content and glycol type." Polymer International 44, no. 2 (October 1997): 143–48. http://dx.doi.org/10.1002/(sici)1097-0126(199710)44:2<143::aid-pi813>3.0.co;2-a.

Full text

APA, Harvard, Vancouver, ISO, and other styles

31

Kiliç, Handan, and Demet Yilmaz. "Various properties of recycled PET (rPET)/organoclay nanocomposite fibres." Plastics, Rubber and Composites 49, no. 4 (January 30, 2020): 164–78. http://dx.doi.org/10.1080/14658011.2020.1720401.

Full text

APA, Harvard, Vancouver, ISO, and other styles

32

Hutchinson, Michael John, Sydney Ella Valentino, Julia Totosy de Zepetnek, Maureen Jane MacDonald, and Victoria Louise Goosey-Tolfrey. "Perceptually regulated training does not influence the differentiated RPE response following 16-weeks of aerobic exercise in adults with spinal cord injury." Applied Physiology, Nutrition, and Metabolism 45, no. 2 (February 2020): 129–34. http://dx.doi.org/10.1139/apnm-2019-0062.

Full text

Abstract:

This study investigated the effect of prolonged familiarisation with ratings of perceived exertion (RPE) on the peripheral (RPEP) and central (RPEC) RPE responses to moderate–vigorous exercise in adults with spinal cord injury (SCI). RPEP and RPEC characterise the exertion of the working musculature and cardiorespiratory systems, respectively. Nineteen participants (age, 41.4 ± 11.4 years; peak oxygen uptake, 19.2 ± 7.2 mL·kg−1·min−1) with chronic SCI were randomly assigned to RPE-guided (n = 11; EXP) or active control (n = 8; CON) groups. EXP performed 16-weeks of RPE-guided, supervised aerobic training for 20 min, twice weekly, at RPE 3–6 (Category-Ratio 10 scale). CON had access to the same exercise equipment but received no specific advice on their exercise-training regime. Participants completed a graded exercise test, using an arm crank ergometer at pre- and post-training to determine peak oxygen uptake, with RPEP and RPEC recorded every minute throughout tests. Sixteen weeks training did not improve peak oxygen uptake. RPE decreased post-training at 50% (p = 0.02) and 70% peak oxygen uptake (p = 0.03), though there was no effect of group at either intensity (p = 0.54, 0.42, respectively). At 70% peak oxygen uptake, RPEP was greater than RPEC (4.2 ± 1.7 vs 3.4 ± 1.8, p < 0.005). Training with RPE-guidance for 16 weeks had no additional effect on the differentiated RPE responses to moderate-vigorous exercise in adults with SCI. Novelty In adults with SCI, differentiated RPE responses were not different between those who did, and did not, perform 16 weeks of RPE-guided training. This challenges whether familiarisation with RPE is necessary to be an effective regulator of exercise intensity in this population.

APA, Harvard, Vancouver, ISO, and other styles

33

Banda-Cruz, Ernestina Elizabeth, Sergio Gabriel Flores-Gallardo, and José Luis Rivera-Armenta. "Study of the dispersion of Cloisite 10A in recycled polyethylene terephtalate by extrusion." DYNA 84, no. 200 (January 1, 2017): 107–11. http://dx.doi.org/10.15446/dyna.v84n200.52720.

Full text

Abstract:

Esta investigación fue enfocada en la dispersión de una arcilla de marca comercial Cloisite 10A en PET reciclado (RPET) para mejorar las propiedades del polímero reciclado que se perdieron en el reprocesamiento de los materiales, específicamente durante la extrusión. Diferentes mezclas de RPET/Cloisite 10A fueron preparadas en un extrusor monohusillo. Las mezclas obtenidas fueron reprocesadas en un extrusor monohusillo tipo reómetro y pasadas a traves de un dado capilar en altos esfuerzos de corte para para incrementar la dispersión de la arcilla en la matriz polimérica. Los resultados muestran degradación física de los materiales. Difracción de rayos X (XRD) indica exfoliación de la arcilla con bajas concentraciones. Además, los resultados reológicos muestran decremento en la viscosidad con incremento de la concentración de la arcilla en las mezclas. Microscopia electrónica de barrido (SEM) revela baja dispersión de la arcilla con incremento de la concentración.

APA, Harvard, Vancouver, ISO, and other styles

34

Ronkay, Ferenc, Béla Molnár, Ferenc Szalay, Dóra Nagy, Brigitta Bodzay, István E. Sajó, and Katalin Bocz. "Development of Flame-Retarded Nanocomposites from Recycled PET Bottles for the Electronics Industry." Polymers 11, no. 2 (February 1, 2019): 233. http://dx.doi.org/10.3390/polym11020233.

Full text

Abstract:

Recycled polyethylene-terephthalate (rPET) nanocomposites of reduced flammability were prepared by combining aluminum-alkylphosphinate (AlPi) flame retardant (FR) and natural montmorillonite (MMT), in order to demonstrate that durable, technical products can be produced from recycled materials. During the development of the material, by varying the FR content, the ratio and the type of MMTs, rheological, morphological, mechanical and flammability properties of the nanocomposites were comprehensively investigated. Related to the differences between the dispersion and nucleation effect of MMT and organo-modified MMT (oMMT) in rPET matrix, analyzed by Scanning Electron Microscopy (SEM), Energy Dispersive X-Ray Spectroscopy (EDS) and Differential Scanning Calorimetry (DSC), mechanical properties of the nanocomposites changed differently. The flexural strength and modulus were increased more significantly by adding untreated MMT than by the oMMT, however the impact strength was decreased by both types of nanofillers. The use of different type of MMTs resulted in contradictory flammability test result; time-to-ignition (TTI) during cone calorimeter tests decreased when oMMT was added to the rPET, however MMT addition resulted in an increase of the TTI also when combined with 4% FR. The limiting oxygen index (LOI) of the oMMT containing composites decreased independently from the FR content, however, the MMT increased it noticeably. V0 classification according to the UL-94 standard was achieved with as low as 4% FR and 1% MMT content. The applicability of the upgraded recycled material was proved by a pilot experiment, where large-scale electronic parts were produced by injection molding and characterized with respect to the commercially available counterparts.

APA, Harvard, Vancouver, ISO, and other styles

35

Vladimirov, Victor, Marcin Pazdro, Thomas Simoner, and Ioan Bica. "R&D and LCA Across the Supply Chain: Choice of Unsaturated Polyester Resins for CC-GRP Pipe Systems." Present Environment and Sustainable Development 11, no. 2 (October 1, 2017): 49–62. http://dx.doi.org/10.1515/pesd-2017-0024.

Full text

Abstract:

Abstract In today’s economy increased attention is given towards re-using of available resources and using of resources which are re-generable, to evaluate and reduce the impact on the environment. For the polymer industry, the development of alternative and renewable raw materials represents an essential task. The study evaluates the different choices of unsaturated polyester resins (UPR) for production of centrifugally-cast glass reinforced pipe (cc-GRP) systems. The environmental impacts of three types of resin were evaluated and compared. The resins are: UPR standard, UPR containing recycled PET material (rPET-UPR) and UPR containing bio-sourced material (BIO-UPR). The analysis focuses on comparing the variations in environmental indicators caused by resin selection for three increasingly complex product layers (Base plate of cc-GRP shaft, cc-GRP Shaft and 1km cc-GRP Pipe-system). The study equally provides an insight onto R&D and LCA collaboration across the supply-chain. One of the main challenges in LCA today is using specific data from the suppliers instead of generic data. The paper indicates how LCA tools and established R&D processes can be employed to transfer LCA calculations across the supply-chain. BIO-UPR and rPET-UPR are alternatives which are realistic in terms of costs and which ensure the required quality for the manufactured products. rPET-UPR can be used for production of complete pipe systems, with positive environmental indicators. Mechanical proprieties of BIO-UPR restrict its usability and use of this resin presents similarities with the debate regarding use of bio-diesel.

APA, Harvard, Vancouver, ISO, and other styles

36

Szabó, V. A., and G. Dogossy. "Structure and properties of closed-cell foam prepared from rPET." IOP Conference Series: Materials Science and Engineering 426 (October 18, 2018): 012043. http://dx.doi.org/10.1088/1757-899x/426/1/012043.

Full text

APA, Harvard, Vancouver, ISO, and other styles

37

Pires, H. M., L. C. Mendes, S. P. Cestari, R. P. Cucinelli Neto, D. C. Rodrigues, and G. C. Mattos. "nZnO as Barrier to Ultraviolet Radiation on rPET/PC Nanocomposites." Journal of Nanoscience and Nanotechnology 16, no. 9 (September 1, 2016): 9987–96. http://dx.doi.org/10.1166/jnn.2016.12080.

Full text

APA, Harvard, Vancouver, ISO, and other styles

38

YILMAZ, Demet, Handan KILIÇ, and Kasım AKSOY. "rPET Atıkları Kullanılarak Bor, Zeolit ve Pomza Partikül Takviyeli Nanokompozit Üretimi." Süleyman Demirel Üniversitesi Fen Bilimleri Enstitüsü Dergisi 22, no. 1 (August 1, 2017): 191. http://dx.doi.org/10.19113/sdufbed.64258.

Full text

APA, Harvard, Vancouver, ISO, and other styles

39

Saleh, Hosni Abdulruhman, and Allam Musbah Al Allam. "Evaluation of the Mechanical Properties of Asphalt Mixture Modified with RPET." Universal Journal of Engineering Science 7, no. 2 (April 2019): 27–31. http://dx.doi.org/10.13189/ujes.2019.070201.

Full text

APA, Harvard, Vancouver, ISO, and other styles

40

White, David J. "Microstructure of Composite Material from High-Lime Fly Ash and RPET." Journal of Materials in Civil Engineering 12, no. 1 (February 2000): 60–65. http://dx.doi.org/10.1061/(asce)0899-1561(2000)12:1(60).

Full text

APA, Harvard, Vancouver, ISO, and other styles

41

Karim, Sarkawt, and Azad Mohammed. "Tests on workability and strength of high strength-flowable concrete containing PET waste fiber." Sulaimani Journal for Engineering Sciences 7, no. 3 (December 30, 2020): 115–39. http://dx.doi.org/10.17656/sjes.10137.

Full text

Abstract:

This study describes two workability tests, compressive strength and tensile strength tests of high strength flowable concrete containing plastic fiber prepared from polyethylene terephthalate (PET) waste bottles. For the high fluidity mix Vebe time and V-funnel time tests were carried out. Results show that there is a Vebe time increase with PET fiber addition to concrete being increased with increasing fiber volume and fiber length. V-funnel time was found to reduce when up to 0.75% fiber volume is added to concrete, followed by an increase for larger fiber volumes. When fiber length is increase, there is more time increase, but in general, V-funnel time increase was lower than that of Vebe time, indicating a different influence of PET fiber on the compatibility and flowability. The measured V-funnel time for all mixes was found to conform to the limits of European specifications on the flowability of self compacting concrete. Small descending in compressive strength was recorded for RPET fiber reinforced concrete that reached 15.74 % for 1.5 percent fiber content with 10 mm fiber length. Attractive results was recorded in split tensile strength of RPET fibrous samples which resulted in improvement up to 63.3 % for 1.5 percent of 40 mm fiber length content.

APA, Harvard, Vancouver, ISO, and other styles

42

Luu, Thi Thanh An, and John R. Baker. "Exploring Consumers’ Purchase Intention of rPET Bottle-Based Apparel in an Emerging Economy." Journal of Open Innovation: Technology, Market, and Complexity 7, no. 1 (January 8, 2021): 22. http://dx.doi.org/10.3390/joitmc7010022.

Full text

Abstract:

This study investigated the applicability (generalizability) of utilizing a partial least squares (PLS) model previously posed to predict consumer purchase intention (PI) of recycled plastics-sourced apparel in a developed economy to predict PI in an emerging economy. To explore the original model’s generalizability, 495 Vietnam residents were surveyed via social media platforms (SMPs). Using partial least squares structural equation modeling (PLS-SEM) path analysis, it was found that three factors significantly affect PI (quality, sustainability, safety), albeit not the same organization of factors found to be significant in the original model. Thus, it is argued that consumer PI in emerging economies may not be entirely congruent with that of developing economies. As prior research of consumer PI of apparel made from recycled poly(ethylene terephthalate) (rPET) bottle fibers in emerging economies is limited, the results of this study, in support of open innovation, provide practical suggestions for marketers and a starting point for future investigations and discussions. The paper also discusses the findings’ relevancy to other contexts and poses suggestions for further study.

APA, Harvard, Vancouver, ISO, and other styles

43

Merijs Meri, R., J. Zicans, R. Maksimovs, T. Ivanova, M. Kalnins, R. Berzina, and G. Japins. "Elasticity and long-term behavior of recycled polyethylene terephthalate (rPET)/montmorillonite (MMT) composites." Composite Structures 111 (May 2014): 453–58. http://dx.doi.org/10.1016/j.compstruct.2014.01.017.

Full text

APA, Harvard, Vancouver, ISO, and other styles

44

Luu, Thi Thanh An, and John R. Baker. "Exploring Consumers’ Purchase Intention of rPET Bottle-Based Apparel in an Emerging Economy." Journal of Open Innovation: Technology, Market, and Complexity 7, no. 1 (January 8, 2021): 22. http://dx.doi.org/10.3390/joitmc7010022.

Full text

Abstract:

This study investigated the applicability (generalizability) of utilizing a partial least squares (PLS) model previously posed to predict consumer purchase intention (PI) of recycled plastics-sourced apparel in a developed economy to predict PI in an emerging economy. To explore the original model’s generalizability, 495 Vietnam residents were surveyed via social media platforms (SMPs). Using partial least squares structural equation modeling (PLS-SEM) path analysis, it was found that three factors significantly affect PI (quality, sustainability, safety), albeit not the same organization of factors found to be significant in the original model. Thus, it is argued that consumer PI in emerging economies may not be entirely congruent with that of developing economies. As prior research of consumer PI of apparel made from recycled poly(ethylene terephthalate) (rPET) bottle fibers in emerging economies is limited, the results of this study, in support of open innovation, provide practical suggestions for marketers and a starting point for future investigations and discussions. The paper also discusses the findings’ relevancy to other contexts and poses suggestions for further study.

APA, Harvard, Vancouver, ISO, and other styles

45

Franz, Roland, and Frank Welle. "Contamination Levels in Recollected PET Bottles from Non-Food Applications and their Impact on the Safety of Recycled PET for Food Contact." Molecules 25, no. 21 (October 28, 2020): 4998. http://dx.doi.org/10.3390/molecules25214998.

Full text

Abstract:

PET beverage bottles have been recycled and safely reprocessed into new food contact packaging applications for over two decades. During recollection of post-consumer PET beverage bottles, PET containers from non-food products are inevitably co-collected and thereby enter the PET recycling feed stream. To explore the impact of this mixing on the safety-in-use of recycled PET (rPET) bottles, we determined the concentrations of post-consumer substances in PET containers used for a range of non-food product applications taken from the market. Based on the chemical nature and amounts of these post-consumer substances, we evaluated their potential carry-over into beverages filled in rPET bottles starting from different fractions of non-food PET in the recollection systems and taking worst-case cleaning efficiencies of super-clean recycling processes into account. On the basis of the Threshold of Toxicological Concern (TTC) concept and Cramer classification tools, we present a risk assessment for potential exposure of the consumer to the identified contaminants as well as unidentified, potentially genotoxic substances in beverages. As a result, a fraction of 5% non-food PET in the recycling feed stream, which is very likely to occur in the usual recollection systems, does not pose any risk to the consumer. Our data show that fractions of up to 20%, which may sporadically be contained in certain, local recollection systems, would also not raise a safety concern.

APA, Harvard, Vancouver, ISO, and other styles

46

Laffon, Eric, and Roger Marthan. "FDG PET for therapy monitoring in Hodgkin’s and non-Hodgkin’s lymphomas: qPET versus rPET." European Journal of Nuclear Medicine and Molecular Imaging 44, no. 9 (May 18, 2017): 1602–3. http://dx.doi.org/10.1007/s00259-017-3719-z.

Full text

APA, Harvard, Vancouver, ISO, and other styles

47

Zaichenko, Nikolai, and Vladislav Nefedov. "Composite material based on the polyethylene terephthalate polymer and modified fly ash filler." MATEC Web of Conferences 245 (2018): 03007. http://dx.doi.org/10.1051/matecconf/201824503007.

Full text

Abstract:

The possibility of filling the recycled polyethylene terephthalate (rPET) with fly ash was studied to make a polymer composite material (PCM). It is shown that high adhesion between polymeric matrix and mineral filler is the key parameter to produce high performance PCM. For this purpose the acid-basic interaction as well as the thermodynamic work of adhesion between components of PCM were calculated. The technique of modifying fly ash filler with 5% concentration solution of sulfuric acid to increase acid-basic interaction has been elaborated. The resulting behavioral patterns are listed and compared to those of composites containing untreated fly ash particles.

APA, Harvard, Vancouver, ISO, and other styles

48

Szabó, V. A., and G. Dogossy. "Recycling of Mineral Water Bottles with Chemical Foaming." Acta Technica Jaurinensis 10, no. 2 (June 29, 2017): 157. http://dx.doi.org/10.14513/actatechjaur.v10.n2.446.

Full text

Abstract:

Today, in the field of packaging technologies there is an increasing amount of one-way polymer materials. Such materials after their short lifecycle are disposed, and such pose a serious environmental impact. However, PET is a good quality technical plastic; the recycled use must be provided. In our research, we have examined the recycled material of mineral water bottles. Chemical foaming of recycled polyethylene terephthalate (rPET) was applied for quality increased reusability. Significant results were achieved in terms of mechanical properties at specific mixtures of chain extender and impact resistance enhancer, at the foaming state of the injection moulding.

APA, Harvard, Vancouver, ISO, and other styles

49

Lei, Yan Hong. "Analysis of Miconazole Nitrate, Econazole Nitrate, Acetic Acid Chloride with the Use of Ultraviolet Spectrophotometry and Chemometrics." Advanced Materials Research 781-784 (September 2013): 1224–27. http://dx.doi.org/10.4028/www.scientific.net/amr.781-784.1224.

Full text

Abstract:

A direct and novel ultraviolet spectrophotometry method for analysis of complex samples was researched and developed with the use of chemometrics, using the Miconazole nitrate, econazole nitrate,acetic acid chloride as example samples. The spectra (range: λ=240~280 nm were processed using Partial least squares (PLS).The ultraviolet spectrophotometry data of the samples were also used to evaluate the samples’ quantitative composition.It was found that the samples were clearly discriminated.A PLS model was developed for simultaneous analysis of the three analytes . The satisfactory prediction results for synthetic samples were obtained by Partial least squares (PLS) as calibration methods (relative prediction error RPET =4.23%).

APA, Harvard, Vancouver, ISO, and other styles

50

Lin, Ching Wen, Wen Hao Hsing, Ching Wen Lou, Jin Mao Chen, and Jia Horng Lin. "Manufacturing Technique and Property Evaluation of Eco-Friendly Kevlar/PET/Nylon Composite Geotextile." Applied Mechanics and Materials 365-366 (August 2013): 1157–60. http://dx.doi.org/10.4028/www.scientific.net/amm.365-366.1157.

Full text

Abstract:

This study produces composite geotextile, and evaluates its effectiveness of being used for soil protection. Kevlar fibers, high strength polyethylene terephthalate (HPET) fibers, recycled polyethylene terephthalate (RPET) fibers, and nylon grids are made into Kevlar/PET/Nylon composite geotextiles, which are then tested for air permeability, and tensile, tearing, and bursting strength. The experimental results show that when the ratio of Kevlar fibers to HPET is 0/40, the resulting composite geotextile has the optimum mechanical properties, where the tensile strength is approximately 990 N, tearing strength is approximately 890 N, bursting strength is approximately 3700, and an air permeability is around 35 cm3/cm2/s.

APA, Harvard, Vancouver, ISO, and other styles

Journal articles on the topic 'RPET'

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles