Gotowe bibliografie tematyczne / Polyethylene nanocomposites

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Gotowa bibliografia na temat „Polyethylene nanocomposites”

Autor: Grafiati

Data publikacji: 6 września 2023

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Artykuły w czasopismach na temat "Polyethylene nanocomposites"

Zazoum, B., E. David i A. D. Ngô. "LDPE/HDPE/Clay Nanocomposites: Effects of Compatibilizer on the Structure and Dielectric Response". Journal of Nanotechnology 2013 (2013): 1–10. http://dx.doi.org/10.1155/2013/138457.

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PE/clay nanocomposites were prepared by mixing a commercially available premixed polyethylene/O-MMT masterbatch into a polyethylene blend matrix containing 80 wt% low-density polyethylene and 20 wt% high-density polyethylene with and without anhydride modified polyethylene (PE-MA) as the compatibilizer using a corotating twin-screw extruder. In this study, the effect of nanoclay and compatibilizer on the structure and dielectric response of PE/clay nanocomposites has been investigated. The microstructure of PE/clay nanocomposites was characterized using wide-angle X-ray diffraction (WAXD) and a scanning electron microscope (SEM). Thermal properties were examined using differential scanning calorimetry (DSC). The dielectric response of neat PE was compared with that of PE/clay nanocomposite with and without the compatibilizer. The XRD and SEM results showed that the PE/O-MMT nanocomposite with the PE-MA compatibilizer was better dispersed. In the nanocomposite materials, two relaxation modes are detected in the dielectric losses. The first relaxation is due to a Maxwell-Wagner-Sillars interfacial polarization, and the second relaxation can be related to dipolar polarization. A relationship between the degree of dispersion and the relaxation ratefmaxof Maxwell-Wagner-Sillars was found and discussed.

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Rodrigues, Tathiane, Maria Tavares, Igor Soares, Ana Moreira i Antonio Ferreira. "The Use of Solid State NMR to Characterize High Density Polyethylene/Organoclay Nanocomposites". Chemistry & Chemical Technology 3, nr 3 (15.09.2009): 187–90. http://dx.doi.org/10.23939/chcht03.03.187.

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Recently the development of new materials, in special polymeric nanocomposites, formed by polymer and layered silicates, have gained attention. In this work nanocomposites based on high-density polyethylene matrix (HDPE) and organically modified clay were prepared by melt processing and characterized by the determination of proton spin-lattice relaxation time through solid state nuclear magnetic resonance (NMR) spectroscopy. This work has a proposal to add one quantitative technique to help the researchers to better evaluate polymeric nanocomposite, because NMR is an important tool employed to study both molecular structure and dynamic molecular behavior. The nanocomposites were mixed in a twin-screw extruder, varying the shear rate parameter: 60 and 90 rpm at 463 K. Nanocomposites obtained were characterized through X-ray diffraction; thermal analysis; impact resistance and nuclear magnetic resonance. The T1H results showed that the samples present different molecular domains according to the clay dispersion, forming an intercalated and/or exfoliated nanocomposites. The measurement of relaxation time, using low field NMR, is a useful method to evaluate changes in the molecular mobility of nanocomposite and can infer whether the sample is exfoliated and/or intercalated, since lamellar filler is used.

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Vigneshwaran, N., A. K. Bharimalla, Virendra Prasad, A. A. Kathe i R. H. Balasubramanya. "Functional Behaviour of Polyethylene-ZnO Nanocomposites". Journal of Nanoscience and Nanotechnology 8, nr 8 (1.08.2008): 4121–26. http://dx.doi.org/10.1166/jnn.2008.an48.

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Hybrid inorganic–organic nanocomposite materials are of current interest because of their multi-functionality, ease of processability, and potential for large-scale manufacturing. The focus of this study is to ascertain the functional properties of the commodity plastic impregnated with ZnO/starch nanocomposites. ZnO/starch nanocomposites was prepared by a simple process using zinc nitrate and sodium hydroxide as precursor and soluble starch as stabilizing agent. The peak obtained in terms of wavelength from UV-visible spectrum is converted in terms of particle size using effective mass approximation method. The plastic sheet of 50 μm thickness was prepared by hot blow method using 1:1 ratio of HDPE:LLDPE and 1% concentration of ZnO/starch nanocomposites. The morphological analysis was carried out using both optical and scanning electron microscopy. For antibacterial activity, evaluation was carried out with Staphylococcus aureus (AATCC 6538), a Gram-positive bacterium and Klebsiella pneumoniae (AATCC 4352), a Gram-negative bacterium. Excellent UV blocking ability was noticed in nanocomposites when compared to the control.

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Ahangaran, Fatemeh, Ali Hassanzadeh, Sirous Nouri i Rasoul Esmaeely Neisiany. "Investigation of thermal and dielectric properties of Fe3O4/high-density polyethylene nanocomposites". Journal of Composite Materials 51, nr 28 (26.02.2017): 3923–29. http://dx.doi.org/10.1177/0021998317695419.

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High-density polyethylene nanocomposites containing Fe3O4 nanoparticles were prepared by employing melt mixing process. The amorphous Fe3O4 nanoparticles with average size about 50 nm were prepared by the conventional coprecipitation method from iron (ΙΙ and ΙΙΙ). Thermal and dielectric properties of high-density polyethylene and its nanocomposites were investigated via differential scanning calorimetry and electrochemical impedance spectroscopy. The crystalline structure of high-density polyethylene and Fe3O4/high-density polyethylene nanocomposite were studied by wide-angle X-ray diffraction, which confirmed orthorhombic crystalline structure. The results of thermal and dielectric analysis indicated that the addition of Fe3O4 nanoparticles to high-density polyethylene matrix leads to decreasing degree of crystallinity and improvement of dielectric constant.

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Bugaev, N. M., Ekaterina L. Kuznetsova i Kyaw Ye Ko. "Thermophysical and Magnetic Properties of Magnetite – Polyethylene Composite". International Journal of Mechanics 15 (9.09.2021): 165–71. http://dx.doi.org/10.46300/9104.2021.15.19.

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In this work, it is shown that the advantage of using matrix-stabilized magnetic nanoparticles to obtain polymer nanocomposites based on them is that such nanoparticles retain their dispersion and stability of size and shape in the technological modes of obtaining polymer nanocomposite materials, and thus ensured stable ferro- and superparamagnetic properties of the obtained target products. For the production of films by the method of hot pressing from blanks obtained in an injection molding machine or a mechanochemical mixture, a manual electrically heated hydraulic press was used. The magnetic properties of nanocomposite samples (about 50 mg on average) were studied using a vibration magnetometer. The character of the dependence of the magnetization on the magnitude of the magnetic field confirms the ferromagnetic character of the behavior of the obtained nanocomposites. The resulting film nanocomposites exhibit ferromagnetic properties at room temperature.

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Kamarudin, Siti Noorhazirah, Kwan Yiew Lau, Chee Wei Tan i Kuan Yong Ching. "The Role of Silicon-Based Nanofillers and Polymer Crystallization on the Breakdown Behaviors of Polyethylene Blend Nanocomposites". Nano 15, nr 08 (sierpień 2020): 2050097. http://dx.doi.org/10.1142/s1793292020500976.

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Good breakdown strength is an important feature for the selection of dielectric materials, especially in high-voltage engineering. Although nanocomposites have been shown to possess many promising dielectric properties, the breakdown strength of nanocomposites is often found to be negatively affected. Recently, imposing nonisothermal crystallization processes on polyethylene blends has been demonstrated to be favorable for breakdown strength improvements of dielectric materials. In an attempt to increase nanocomposites’ voltage rating, this work reports on the effects of nonisothermal crystallization (fast, moderate and slow crystallizations) on the structure and dielectric properties of a polyethylene blend (PE) composed of 80% low density polyethylene and 20% high density polyethylene, added with silicon dioxide (SiO2) and silicon nitride (Si3N4) nanofillers. Through breakdown testing, the breakdown performance of Si3N4-based nanocomposites was better than SiO2-based nanocomposites. Since nanofiller dispersion within both nanocomposite systems was comparable, the enhanced breakdown performance of Si3N4-based nanocomposites is attributed to the surface chemistry of Si3N4 containing less hydroxyl groups than SiO2. Furthermore, the breakdown strength of SiO2-based nanocomposites and Si3N4-based nanocomposites improved, with the DC breakdown strength increasing by at least 12% when both the nanocomposites were subjected to moderate crystallization rather than fast and slow crystallizations. This is attributed to changes in the underlying molecular conformation of PE in addition to water-related effects. These results suggest that apart from changes in the nanofiller surface chemistry, changes in the underlying molecular conformation of polymers are also important to improve the breakdown performance of nanocomposites.

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Okolo, Chinyere, Rafaila Rafique, Sadia Sagar Iqbal, Mohd Shahneel Saharudin i Fawad Inam. "Carbon Nanotube Reinforced High Density Polyethylene Materials for Offshore Sheathing Applications". Molecules 25, nr 13 (27.06.2020): 2960. http://dx.doi.org/10.3390/molecules25132960.

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Multiwall carbon nanotube (CNT)-filled high density polyethylene (HDPE) nanocomposites were prepared by extrusion and considered for their suitability in the offshore sheathing applications. Transmission electron microscopy was conducted to analyse dispersion after bulk extrusion. Monolithic and nanocomposite samples were subjected to accelerated weathering and photodegradation (carbonyl and vinyl indices) characterisations, which consisted of heat, moisture (seawater) and UV light, intended to imitate the offshore conditions. The effects of accelerated weathering on mechanical properties (tensile strength and elastic modulus) of the nanocomposites were analysed. CNT addition in HDPE produced environmentally resilient nanocomposites with improved mechanical properties. The energy utilised to extrude nanocomposites was also less than the energy used to extrude monolithic HDPE samples. The results support the mass substitution of CNT-filled HDPE nanocomposites in high-end offshore applications.

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Olkhov, Anatoliy, i Gennady Zaikov. "Nanocomposites Based on Polyethylene and Nanocrystalline Silicon Films". Vestnik Volgogradskogo gosudarstvennogo universiteta. Serija 10. Innovatcionnaia deiatel’nost’, nr 6 (15.12.2014): 63–72. http://dx.doi.org/10.15688/jvolsu10.2014.6.6.

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Sangawar, Vijaya S., i Manisha C. Golchha. "Optical Properties of ZnO/Low Density Polyethylene Nanocomposites". International Journal of Scientific Research 2, nr 7 (1.06.2012): 490–92. http://dx.doi.org/10.15373/22778179/july2013/169.

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Qin, Jun, Huan Zhang, Li Ping Chen i Jie Yu. "The Structure and Properties of HDPE/EAA-Hydrotalcite Master Batch Nanocomposites". Advanced Materials Research 450-451 (styczeń 2012): 715–18. http://dx.doi.org/10.4028/www.scientific.net/amr.450-451.715.

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The High-density polyethylene (HDPE) / the ethylene acrylic acid (EAA) - layered double hydroxide (LDH) nanocomposites were prepared by melt blending with EAA)/ LDH master batch; and the structure and properties of this nanocomposite were studied. The results showed that the EAA acted as an effective compatibilizer for the nanocomposites can enhance the interfacial adhesion between LDH and HDPE obviously, promote the dispersion of LDH in the matrix, increase both the tensile strength and toughness of nanocomposites, and improve the thermal stability and delay the onset decomposition temperature of nanocomposites.

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Rozprawy doktorskie na temat "Polyethylene nanocomposites"

Green, Christopher Duncan. "Polyethylene-montmorillonite nanocomposites". Thesis, University of Southampton, 2008. https://eprints.soton.ac.uk/65001/.

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Nanocomposite materials are currently attracting much interest due to their possibility of global property improvement – mechanical strength, toughness, electrical breakdown strength, electrical erosion resistance and flame retardancy. In order to disperse montmorillonite clay (MMT) into polyethylene (PE), the clay sheets need to be rendered organophilic. Masterbatches with a high level (~40 %wt) of organomodified clay can then be dispersed into a host by a simple mechanical process. Two chemically different masterbatches were purchased: Nanoblend 2101 from PolyOne Corp. and C30PE from Nanocor Inc. These were let down using a RandcastleTM single screw extruder with a patented mixing device to provide elongational flow. Wide angle X-ray diffraction was used together with transmission electron microscopy to evaluate the particle dispersion, which consisted of intercalated clay organised in clusters up to one micron in diameter. The performance of these materials was assessed in terms of AC ramp breakdown statistics, dielectric spectroscopy, dynamic and tensile mechanical properties. Nanoblend masterbatch consistently improved the breakdown statistics, more than overcoming the inherent demerit of extrusion, which mildly aged the unfilled material (as confirmed by Raman spectroscopy.) On the other hand, even low loading levels of Nanocor could result in reduced breakdown strength and increased scatter. Furthermore, both sets of materials demonstrated large dielectric losses at power frequencies and poorer performance under mechanical tension. These materials would therefore require considerable development before they could confidently be used commercially. The nature of the PE-MMT interactions was examined by investigating the crystallisation kinetics and resulting morphologies with differential scanning calorimetry and scanning electron microscopy. By varying the masterbatch type, loading level and crystallisation temperature, it was possible to study a wide range of supercrystalline morphologies using a permanganic etching technique. This is a useful contribution to the field of nanocomposites research. It is known that the morphologies of polymers can affect their mechanical properties and electrical treeing behaviour, and so it is possible that controlled crystallisation could provide a route toward designer materials with optimised behaviour.

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Isik, Fatma. "Nanocomposites Based On Blends Of Polyethylene". Master's thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/3/12606338/index.pdf.

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In this study the effects of compatibilizer type, organoclay type, and the addition order of components on the morphological, thermal, mechanical and flow properties of ternary nanocomposites based on low density polyethylene, LDPE were investigated. As compatibilizer, ethylene/methyl acrylate/glycidyl methacrylate, ethylene/glycidyl methacrylate, and ethylene/butyl acrylate/maleic anhydride
as organoclay Cloisite&
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15A, Cloisite&
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25A and Cloisite&
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30B were used. All samples were prepared by a co-rotating twin screw extruder, followed by injection molding. Before producing the ternary nanocomposites, in order to determine the optimum amount of the organoclay and compatibilizer, binary mixtures of LDPE/organoclay and LDPE/compatibilizer blends with different compositions were prepared. Based on the results of the mechanical tests, compatibilizer and organoclay contents were determined as 5 wt. % and 2 wt % respectively. After that, ternary nanocomposites were prepared with each compatibilizer/organoclay system and characterization of these nanocomposites was performed. Among the investigated addition orders, mechanical test results showed that the best sequence of component addition was (PCoC), in which LDPE, compatibilizer and organoclay were simultaneously compounded in the first run of the extrusion. Considering the ternary nanocomposites, compositions of LDPE/E-MA-GMA/15A, LDPE/E-GMA/15A and LDPE/E-nBA-MAH/30B showed the highest improvement in mechanical properties. According to the DSC analysis, addition of organoclay and compatibilizer does not influence the melting behavior of the compositions and both compatibilizers and organoclay types have no nucleation activity in LDPE. In the X-Ray analysis, the highest increase of the basal spacing for ternary nanocomposites obtained for LDPE/E-BA-MAH/organoclay nanocomposites. This increase was 83 %, 198 %, and 206 % for samples containing 15A, 25A and 30B respectively.

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Shaito, Ali Al-Abed. "Long Term Property Prediction of Polyethylene Nanocomposites". Thesis, University of North Texas, 2008. https://digital.library.unt.edu/ark:/67531/metadc9738/.

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The amorphous fraction of semicrystalline polymers has long been thought to be a significant contributor to creep deformation. In polyethylene (PE) nanocomposites, the semicrystalline nature of the maleated PE compatibilizer leads to a limited ability to separate the role of the PE in the nanocomposite properties. This dissertation investigates blown films of linear low-density polyethylene (LLDPE) and its nanocomposites with montmorillonite-layered silicate (MLS). Addition of an amorphous ethylene propylene copolymer grafted maleic anhydride (amEP) was utilized to enhance the interaction between the PE and the MLS. The amorphous nature of the compatibilizer was used to differentiate the effect of the different components of the nanocomposites; namely the matrix, the filler, and the compatibilizer on the overall properties. Tensile test results of the nanocomposites indicate that the addition of amEP and MLS separately and together produces a synergistic effect on the mechanical properties of the neat PE Thermal transitions were analyzed using differential scanning calorimetry (DSC) to determine if the observed improvement in mechanical properties is related to changes in crystallinity. The effect of dispersion of the MLS in the matrix was investigated by using a combination of X-ray Diffraction (XRD) and Scanning Electron Microscopy (SEM). Mechanical measurements were correlated to the dispersion of the layered silicate particles in the matrix. The nonlinear time dependent creep of the material was analyzed by examining creep and recovery of the films with a Burger model and the Kohlrausch-Williams-Watts (KWW) relation. The effect of stress on the nonlinear behavior of the nanocomposites was investigated by analyzing creep-recovery at different stress levels. Stress-related creep constants and shift factors were determined for the material by using the Schapery nonlinear viscoelastic equation at room temperature. The effect of temperature on the tensile and creep properties of the nanocomposites was analyzed by examining tensile and creep-recovery behavior of the films at temperatures in the range of 25 to -100 oC. Within the measured temperature range, the materials showed a nonlinear temperature dependent response. The time-temperature superposition principle was successfully used to predict the long term behavior of LLDPE nanocomposites.

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Alghamdi, Abdulaziz. "Mechanical characterisation of novel polyethylene-based nanocomposites". Thesis, University of Nottingham, 2014. http://eprints.nottingham.ac.uk/14120/.

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Polymer-based nanocomposites are of significant current research interest owing to their outstanding mechanical properties, light weight, processability and low cost. They are also increasingly being considered for a range of industrial applications, including packaging, fuel tanks, gas barriers and high performance films. Ultra-high molecular weight polyethylene (UHMWPE) is already used in various applications, such as lightweight body armour because of its high impact resistance with light weight and total joint replacement due to its high wear resistance. However, a broader use of UHMWPE is limited by the complexity and cost of the manufacturing process, which can be attributed to its high viscosity at processing temperatures. The processability of UHMWPE can be improved by blending with a compatible, lower molecular weight polymer, however, this inevitably results in a reduction in some of the useful properties, such as impact resistance. In this work the potential of adding nano-fillers to such blends to create a range of nanocomposite polymers with the advantages of easy processability and enhanced properties is investigated. The overall aim of this research was to investigate the effect of processing method, strain rate, nanoparticle type and content on the morphological, thermal and mechanical properties of a family of novel polyethylene-based nanocomposites. Polymer nanocomposites of blended UHMWPE and high density polyethylene (HDPE) reinforced with carbon black (CB), carbon nanotubes (CNTs) or inorganic clay were prepared using conventional processing techniques. After initial experiments into the effects of processing parameters, two sets of processing parameters were selected that gave different blend morphology in order to investigate the effect of this on the blend properties and nanofiller dispersion. Characterization of the pure, blended and nanocomposite materials was achieved by the application of combination of experimental techniques. Tensile testing was carried out to characterise the effect of processing method, strain rate, ambient temperature, nanoparticle type and content on the stress-strain behaviour and also to study heat generation during plastic deformation at high strain rates. Depth sensing indentation (DSI) tests were carried out to characterise the effect of processing method, ambient temperature, nanoparticle type and content on the near-surface properties of the materials at a micro-scale under a more complex state of stress that more closely approximates that seen in impact applications. The creep behaviour of the materials was investigated at macro and micro scales at various ambient temperatures. This is important as a weakness of UHMWPE is poor creep resistance and it would be extremely useful if blending or the addition of nanofillers could improve this. A phenomenological model was used to analyse the creep data as this can be usefully used to predict creep performance in service and to aid understanding of the creep phenomena in these materials. The results included in this work are summarised below. Firstly, it was seen that processing parameters had a significant effect on the morphology of the blends, which in turn affected the blend properties and the dispersion of nanoparticles in the blend. Secondly, it was seen that heat generation during plastic deformation of the polyethylene blends and nanocomposites was significantly dependent on morphology, strain rate, nanoparticle type and content. Furthermore, this temperature increase strongly affected the material properties at high strain rates, which is an important consideration if these materials are to be used in high strain rate applications, e.g. as replacement for UHMWPE in helmets and body armour. Thirdly, the macro and micro viscoelastic behaviour of the materials was strongly dependent on the morphology, nanoparticle type and content. A significant increase in creep resistance compared with UHMWPE could be engineered by a careful selection of blend and nanoparticle type and weight fraction. It can be seen, therefore, that a new class of cheap and easy processable polymer nanocomposites have been characterised that can give a range of property sets dependent on the blend processing and nanofiller type and weight fraction. Although certain compromises in property sets are unavoidable, e.g. it is difficult to engineer maximum creep and impact resistance in the same material, this ability to tailor properties could potentially increase the range of applications for these materials and enable better product design.

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BAFNA, AYUSH ASHOK. "POLYETHYLENE-CLAY NANOCOMPOSITES: PROCESSING-STRUCTURE-PROPERTY RELATIONSHIP". University of Cincinnati / OhioLINK, 2004. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1083810121.

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Shaito, Ali Al-Abed D'Souza Nandika Anne. "Long term property prediction of polyethylene nanocomposites". [Denton, Tex.] : University of North Texas, 2008. http://digital.library.unt.edu/permalink/meta-dc-9738.

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Bafna, Ayush A. "Polyethylene-clay nanocomposites processing-structure-property relationship /". Cincinnati, Ohio : University of Cincinnati, 2004. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=ucin1083810121.

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Chan, Hong Yu. "Crystallization of polypropylene/vermiculite and polyethylene/vermiculite nanocomposites". access abstract and table of contents access full-text, 2004. http://libweb.cityu.edu.hk/cgi-bin/ezdb/dissert.pl?msc-ap-b21173990a.pdf.

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Thesis (M.Sc.)--City University of Hong Kong, 2004.
At head of title: City University of Hong Kong, Department of Physics and Materials Science, Master of Science in materials engineering & nanotechnology dissertation. Title from title screen (viewed on Aug. 31, 2006) Includes bibliographical references.

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Al-Fouzan, Abdulrahman M. "Polyethylene Terephthalate / clay nanocomposites. Compounding, fabrication and characterisation of the thermal, rheological, barrier and mechanical properties of Polyethylene Terephthalate / clay nanocomposites". Thesis, University of Bradford, 2011. http://hdl.handle.net/10454/5283.

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Polyethylene Terephthalate (PET) is one of the most important polymers in use today for packaging due to its outstanding properties. The usage of PET has grown at the highest rate compared with other plastic packaging over the last 20 years, and it is anticipated that the increase in global demand will be around 6% in the 2010-2015 period. The rheological behaviour, thermal properties, tensile modulus, permeability properties and degradation phenomena of PET/clay nanocomposites have been investigated in this project. An overall, important finding is that incorporation of nanoclays in PET gives rise to improvements in several key process and product parameters together - processability/ reduced process energy, thermal properties, barrier properties and stiffness. The PET pellets have been compounded with carefully selected nanoclays (Somasif MAE, Somasif MTE and Cloisite 25A) via twin screw extrusion to produce PET/clay nanocomposites at various weight fractions of nanoclay (1, 3, 5, 20 wt.%). The nanoclays vary in the aspect ratio of the platelets, surfactant and/or gallery spacing so different effect are to be expected. The materials were carefully prepared prior to processing in terms of sufficient drying and re-crystallisation of the amorphous pellets as well as the use of dual motor feeders for feeding the materials to the extruder. The rheological properties of PET melts have been found to be enhanced by decreasing the viscosity of the PET i.e. increasing the 'flowability' of the PET melt during the injection or/and extrusion processes. The apparent shear viscosity of PETNCs is show to be significantly lower than un-filled PET at high shear rates. The viscosity exhibits shear thinning behaviour which can be explained by two mechanisms which can occur simultaneously. The first mechanism proposed is that some polymer has entangled and few oriented molecular chain at rest and when applying high shear rates, the level of entanglements is reduced and the molecular chains tend to orient with the flow direction. The other mechanism is that the nanoparticles align with the flow direction at high shear rates. At low shear rate, the magnitudes of the shear viscosity are dependent on the nanoclay concentrations and processing shear rate. Increasing nanoclay concentration leads to increases in shear viscosity. The viscosity was observed to deviate from Newtonian behaviour and exhibited shear thinning at a 3 wt.% concentration. It is possible that the formation of aggregates of clay is responsible for an increase in shear viscosity. Reducing the shear viscosity has positive benefits for downstream manufacturers by reducing power consumption. It was observed that all ii three nanoclays used in this project act as nucleation agents for crystallisation by increasing the crystallisation temperature from the melt and decreasing the crystallisation temperature from the solid and increasing the crystallisation rate, while retaining the melt temperature and glass transition temperatures without significant change. This enhancement in the thermal properties leads to a decrease in the required cycle time for manufacturing processes thus potentially reducing operational costs and increasing production output. It was observed that the nanoclay significantly enhanced the barrier properties of the PET film by up to 50% this potentially allows new PET packaging applications for longer shelf lives or high gas pressures. PET final products require high stiffness whether for carbonated soft drinks or rough handling during distribution. The PET/Somasif nanocomposites exhibit an increase in the tensile modulus of PET nanocomposite films by up to 125% which can be attributed to many reasons including the good dispersion of these clays within the PET matrix as shown by TEM images as well as the good compatibility between the PET chains and the Somasif clays. The tensile test results for the PET/clay nanocomposites micro-moulded samples shows that the injection speed is crucial factor affecting the mechanical properties of polymer injection moulded products.

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Karlsson, Mattias. "Investigation of the dielectric breakdown strength of polymer nanocomposites". Thesis, Uppsala universitet, Tillämpad materialvetenskap, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-227815.

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The aim of this thesis is to investigate the possibility of enhancing the dielectric breakdown strength (DBS) of low density polyethylene (LDPE) with addition of voltage stabilizing additives. In the first part of the thesis, the influence of various process parameters on the alternating current DBS of pure LDPE and LDPE containing either 3 or 30 wt% magnesium oxide nanoparticles was investigated. It was found that the influence of moisture, crystalline structure and process stabilizing additives did not affect the DBS. In the second part of the thesis the effect of five different voltage stabilizing additives was investigated to enhance the DBS. No significant improvement in DBS could be seen for additives mixed with neat LDPE or LDPE nanocomposites by extrusion (typical DBS values ranged between 109-116 kV/mm for neat LDPE). However, the compounding by extrusion resulted in better stability of the breakdown data. A method to swell voltage stabilizing additives into the polymer matrix with solvents have been developed and evaluated. No significant improvements in breakdown strength could be seen for neat LDPE, but the DBS was increased by 15-20 % at low probability of failure for the LDPE nanocomposites. Further work is required to investigate if this increase is significant. It is believed that it is critical to dissolve a higher amount of the voltage stabilizing additives into the polymer matrix. The actual concentrations of the additives need to be quantified with chromatographic methods or infrared spectroscopy.

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Książki na temat "Polyethylene nanocomposites"

Thomas, Jince, Sabu Thomas i Zakiah Ahmad, red. Crosslinkable Polyethylene Based Blends and Nanocomposites. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-0486-7.

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Visakh, P. M., i María José Martínez Morlanes, red. Polyethylene-Based Blends, Composites and Nanocomposites. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2015. http://dx.doi.org/10.1002/9781118831328.

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Polyethylene-based blends, composites and nanocomposities. Hoboken, New Jersey: Wiley, 2015.

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Thomas, Sabu, Zakiah Ahmad i Jince Thomas. Crosslinkable Polyethylene Based Blends and Nanocomposites. Springer Singapore Pte. Limited, 2021.

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Thomas, Sabu, Zakiah Ahmad i Jince Thomas. Crosslinkable Polyethylene Based Blends and Nanocomposites. Springer, 2022.

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Visakh, P. M., Cristina Della Pina i Ermelinda Falletta. Polyaniline Blends, Composites, and Nanocomposites. Elsevier Science & Technology Books, 2017.

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Visakh, P. M., Cristina Della Pina i Ermelinda Falletta. Polyaniline Blends, Composites, and Nanocomposites. Elsevier, 2017.

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Visakh, P. M., i Mong Liang. Poly(Ethylene Terephthalate) Based Blends, Composites and Nanocomposites. Elsevier Science & Technology Books, 2015.

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Visakh, P. M., i Mong Liang. Poly(Ethylene Terephthalate) Based Blends, Composites and Nanocomposites. Elsevier Science & Technology Books, 2015.

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M, Visakh P., i María José Martínez Morlanes. Polyethylene-Based Blends, Composites and Nanocomposities. Wiley & Sons, Limited, John, 2015.

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Części książek na temat "Polyethylene nanocomposites"

Marchante, Veronica, i Maribel Beltrán. "Montmorillonite Polyethylene Nanocomposites". W Polyethylene-Based Blends, Composites and Nanocomposites, 257–80. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2015. http://dx.doi.org/10.1002/9781118831328.ch8.

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Fernandes, Emanuel M., João F. Mano i Rui L. Reis. "Polyethylene Composites with Lignocellulosic Material". W Polyethylene-Based Blends, Composites and Nanocomposites, 117–61. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2015. http://dx.doi.org/10.1002/9781118831328.ch5.

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Sánchez-Valdes, Saul, i M. L. López-Quintanilla. "Polyethylene-Clay Nanocomposites Using Ionomeric Compatibilizer". W Advances in Science and Technology, 1399–404. Stafa: Trans Tech Publications Ltd., 2006. http://dx.doi.org/10.4028/3-908158-01-x.1399.

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Chaudhry, A. U., Vikas Mittal* i N. B. Matsko. "Chapter 6. Microstructure and Properties of Compatibilized Polyethylene–Graphene Oxide Nanocomposites". W Polymer-Graphene Nanocomposites, 141–61. Cambridge: Royal Society of Chemistry, 2012. http://dx.doi.org/10.1039/9781849736794-00141.

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Ray, Sudip, Ashveen Nand i Paul A. Kilmartin. "Polyethylene-Based Conducting Polymer Blends and Composites". W Polyethylene-Based Blends, Composites and Nanocomposites, 93–116. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2015. http://dx.doi.org/10.1002/9781118831328.ch4.

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Zapata, Paula A., i Humberto Palza. "Polyethylene-based Bio- and Nanocomposites for Packaging Applications". W Polyethylene-Based Biocomposites and Bionanocomposites, 365–404. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2016. http://dx.doi.org/10.1002/9781119038467.ch10.

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Visakh, P. M., i María José Martínez Morlanes. "Polyethylene-Based Blends, Composites and Nanocomposites: State-of-the-Art, New Challenges and Opportunities". W Polyethylene-Based Blends, Composites and Nanocomposites, 1–19. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2015. http://dx.doi.org/10.1002/9781118831328.ch1.

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Collins, Maurice N., Declan Barron i Colin Birkinshaw. "Ultra High Molecular Weight Polyethylene (UHMWPE) for Orthopaedic Devices: Structure/Property Relationships". W Polyethylene-Based Blends, Composites and Nanocomposites, 21–39. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2015. http://dx.doi.org/10.1002/9781118831328.ch2.

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Richaud, Emmanuel. "Stabilization of Irradiated Polyethylene by Introduction of Antioxidants (Vitamin E)". W Polyethylene-Based Blends, Composites and Nanocomposites, 41–91. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2015. http://dx.doi.org/10.1002/9781118831328.ch3.

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Rives, V., F. M. Labajos i M. Herrero. "Layered Double Hydroxides as Nanofillers of Composites and Nanocomposite Materials Based on Polyethylene". W Polyethylene-Based Blends, Composites and Nanocomposites, 163–99. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2015. http://dx.doi.org/10.1002/9781118831328.ch6.

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Streszczenia konferencji na temat "Polyethylene nanocomposites"

Gaska, Karolina, Roland Kádár, Xiangdong Xu, Stanislaw Gubanski, Christian Müller, Santosh Pandit, Venkata R. S. S. Mokkapati i in. "Highly structured graphene polyethylene nanocomposites". W MATERIALS CHARACTERIZATION USING X-RAYS AND RELATED TECHNIQUES. Author(s), 2019. http://dx.doi.org/10.1063/1.5088319.

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Xu, Songbo, Aydar Akchurin, X. W. Tangpong, Iskander S. Akhatov, Tian Liu, Weston Wood i Wei-Hong Zhong. "Tribological Behavior of High Density Polyethylene Nanocomposites With Silane Treated Carbon Nanofibers". W ASME 2011 International Mechanical Engineering Congress and Exposition. ASMEDC, 2011. http://dx.doi.org/10.1115/imece2011-62701.

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New applications of carbon-based materials have been continuously developed in recent years. Carbon Nanofibers (CNFs) with silane coatings were added into high density polyethylene (HDPE) to improve the tribological properties of the nanocomposite material for biomedical applications. The nanocomposites were fabricated with various weight percentages of carbon nanofibers (0.5%, 1%, 3%) that were treated with different silane coating thicknesses (2.8nm, 46nm) through melt-mixing and compressive processing. The wear and friction tests were performed on a pin-on-disc tribometer under phosphate buffered saline lubricated condition. Compared with the pure HDPE, the friction coefficients of the nanocomposites were reduced dramatically and their wear resistance properties were also improved. Micro-hardness measurements of the nanocomposites were carried out and CNFs were found to be capable of improving the material’s micro-hardness effectively. The effects of concentration and silane coating thickness of CNFs on the tribological properties of the resulting nanocomposites were analyzed and the wear mechanism of the CNF/HDPE nanocomposites was discussed.

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Shaito, Ali A., Nandika A. D'Souza, Debora Fairbrother i Jerry Sterling. "Nonlinear Stress and Temperature Creep Relations in Polymer Nanocomposites". W ASME 2006 International Mechanical Engineering Congress and Exposition. ASMEDC, 2006. http://dx.doi.org/10.1115/imece2006-16072.

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Stress and temperature response of Polyethylene (PE) nanocomposites is mapped and predicted using creep-recovery measurements. The results indicate that the PE nanocomposite exhibit nonlinear response. When montmorillonite layered silicates (MLS) are introduced into the polymer, the stress response deviates substantially. Recovery curves of the nanocomposites were lower than those of the creep response. Viscoplastic strain was lower in the case of the nanocomposites. The material responses are analyzed using mechanical analogs.

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Petukhova, E. S., i O. V. Gogoleva. "Investigation of polyethylene nanocomposites for pipes". W MECHANICS, RESOURCE AND DIAGNOSTICS OF MATERIALS AND STRUCTURES (MRDMS-2017): Proceedings of the 11th International Conference on Mechanics, Resource and Diagnostics of Materials and Structures. Author(s), 2017. http://dx.doi.org/10.1063/1.5017338.

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Alexandrescu, Laurentia, Mihai Georgescu, Maria Sönmez, Anton Ficai, Roxana Trusca i Ioana Lavinia Ardelean. "Polyamide/Polyethylene/Carbon Fibre Polymer Nanocomposites". W The 9th International Conference on Advanced Materials and Systems. INCDTP - Leather and Footwear Research Institute (ICPI), Bucharest, Romania, 2022. http://dx.doi.org/10.24264/icams-2022.i.2.

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Polyamide and polyethylene are well known as engineering thermoplastic materials that are widely used in industrial applications for their good mechanical and thermal properties. The paper presents the study of the new nanostructured polymer composites based on polyamide/ compatibilizers/polyethylene/carbon fibres nanoparticles-PA/PE-g-MA/PE/CF in order to obtain, by injection, centre pivot liner, centre plates, and other components for the railway industry, with impact resistance higher than 5-8 kJ/m², abrasion resistance below 100 mm3, resistance to temperatures of -40 - 240°C, resistance to impact and to outdoor applications, with temperatures ranging from -40 to +60°C, in rain, snow or sunshine. The influence of carbon fibres nanoparticles (CF) on the rheological and physico-mechanical properties of the polyamide was studied. The nanocomposites based on polyamide/ compatibilizers/ polyethylene/carbon fibres nanoparticles were characterized by scanning electron microscopy (SEM) and Fourier transformation infrared spectrum (FT-IR) and in terms of physico-mechanical properties. The studied nanocomposites have higher values compared to the blank samples, and the requirements of the railway of impact strength of 5 KJ/m2. Carbon fiber concentrations greater than 1.5% result in decreases in impact strength values, similar to traction resistance values, but not lower than standard values. This leads to the conclusion that the percentages of carbon fibers in the range of 0.1-1.5% achieve maximum values of physical-mechanical parameters.

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Xu, Songbo, Aydar Akchurin, X. W. Tangpong, Tian Liu, Weston Wood i Wei-Hong Zhong. "Comparison of Tribological Performances of High Density Polyethylene Enhanced With Carbon Nanofibers". W ASME 2012 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/imece2012-86150.

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High density polyethylene (HDPE) is widely used as bearing material in industrial application because of its low friction and high wear resistance properties. Carbon nanofiber (CNF) reinforced HDPE nanocomposites are promising materials for biomedical applications as well, such as being the bearing materials in total joint replacements. The main objective of the present study is to investigate how the wear of HDPE can be altered by the addition of either pristine or silane treated CNFs at different loading levels (0.5 wt.% and 3 wt.%). Two types of silane coating thicknesses, 2.8 nm and 46 nm, were applied on the surfaces of oxidized CNFs to improve the interfacial bonding strength between the CNFs and the matrix. The CNF/HDPE nanocomposites were prepared through melt mixing and hot-pressing. The coefficients of friction (COFs) and wear rates of the neat HDPE and CNF/HDPE nanocomposites were determined using a pin-on-disc tribometer under dry sliding conditions. The microstructures of the worn surfaces of the nanocomposites were characterized using both scanning electron microscope (SEM) and optical microscope to analyze their wear mechanisms. Compared with the neat HDPE, the COF of the nanocomposites were reduced. The nanocomposite reinforced with CNFs coated with the thicker silane coating (46 nm) at 0.5 wt.% loading level was found to yield the highest wear resistance with a wear rate reduction of nearly 68% compared to the neat HDPE.

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Moghimian, Nima, Sajjad Saeidlou, Helen Lentzakis, Gian Flippo Rosi, Naiheng Song i Eric David. "Electrical conductivity of commercial graphene polyethylene nanocomposites". W 2017 IEEE 17th International Conference on Nanotechnology (IEEE-NANO). IEEE, 2017. http://dx.doi.org/10.1109/nano.2017.8117344.

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Chao Zhang, R. Mason i G. C. Stevens. "Dielectric properties of epoxy and polyethylene nanocomposites". W Proceedings of 2005 International Symposium on Electrical Insulating Materials, 2005. (ISEIM 2005). IEEE, 2005. http://dx.doi.org/10.1109/iseim.2005.193571.

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Li, Shengtao, Guilai Yin i Jianying Li. "Breakdown performance of low density polyethylene nanocomposites". W 2012 IEEE 10th International Conference on the Properties and Applications of Dielectric Materials (ICPADM). IEEE, 2012. http://dx.doi.org/10.1109/icpadm.2012.6318900.

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Yan Wang, Zhiqiang Xu, George Chen i Alun Vaughan. "DC current in nanosilica-based polyethylene nanocomposites". W 2015 IEEE Conference on Electrical Insulation and Dielectric Phenomena - (CEIDP). IEEE, 2015. http://dx.doi.org/10.1109/ceidp.2015.7352137.

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