Journal articles: 'Cellulose-based polyesters'

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Li, Dongfang, Tommy Iversen, and Monica Ek. "Hydrophobic materials based on cotton linter cellulose and an epoxy-activated polyester derived from a suberin monomer." Holzforschung 69, no. 6 (August 1, 2015): 721–30. http://dx.doi.org/10.1515/hf-2014-0261.

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Abstract Suberin is a natural hydrophobic material that could be used to improve the water repellency of cellulose surfaces. It is also abundant in the outer bark of birch (Betula verrucosa); birch bark is a side-stream product in Scandinavia from the forest industry, which is generally burned for energy production. A suberin monomer, cis-9,10-epoxy-18-hydroxyoctadecanoic acid, was isolated from birch outer bark and polymerized via lipase (immobilized Candida antarctica lipase B). The resulting epoxy-activated polyester was characterized by nuclear magnetic resonance (NMR) imaging, matrix-assisted laser desorption/ionization-time-of-flight mass spectrometry, and size exclusion chromatography. Then the polyester was cured with tartaric or oxalic acid, and the crosslinked polyesters were characterized by Fourier transform infrared spectroscopy (FTIR) and differential scanning calorimetry. Hydrophobic materials were prepared by compression molding of polyester-impregnated cellulose sheets, and the final products were characterized by FTIR, cross-polarization magic angle spinning 13C NMR, and field-emission scanning electron microscopy. The water contact angle was significantly increased from 0° for the original cellulose sheets to over 100° for the produced hydrophobic materials.

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Zhang, Junhua, Yao Liu, Zhaohua Qi, Liang He, and Lincai Peng. "Progress in the synthesis and properties of 2,5-furan dicarboxylate based polyesters." BioResources 15, no. 2 (February 14, 2020): 4502–27. http://dx.doi.org/10.15376/biores.15.2.zhang.

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Biomass is a class of abundant renewable resource. Its efficient use in the field of biobased materials is one of the important ways for implementation of sustainable development strategies. 2,5-Furandicarboxylic acid (FDCA) as a potential alternative of terephthalic acid (PTA) to make alipharomatic polyesters, can be obtained in mass amount from cellulose via bio- or chemical process. For this reason, FDCA-based polyesters have gained high interest recently. This review systematically summarizes recent progress in the making of FDCA-based polyesters (including poly(ethylene 2,5-furandicarboxylate) (PEF), poly(propylene 2,5-furandicarboxylate) (PPF), poly(butylene 2,5-furandicarboxylate) (PBF), poly(hexylene 2,5-furandicarboxylate) (PHF), and their copolyesters), especially highlighting the progress and fundamental aspects for their synthesis and properties. Significant advantages (and also disadvantages) of the FDCA-based polyesters are clearly indicated relative to price, performance, and sustainable development, in reference to traditional petroleum-based polyesters in industrial application. The goal of this review is to provide useful information regarding the synthesis and properties of FDCA-based polyesters.

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Abe, Mateus Manabu, Marcia Cristina Branciforti, and Michel Brienzo. "Biodegradation of Hemicellulose-Cellulose-Starch-Based Bioplastics and Microbial Polyesters." Recycling 6, no. 1 (March 22, 2021): 22. http://dx.doi.org/10.3390/recycling6010022.

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The volume of discarded solid wastes, especially plastic, which accumulates in large quantities in different environments, has substantially increased. Population growth and the consumption pattern of societies associated with unsustainable production routes have caused the pollution level to increase. Therefore, the development of materials that help mitigate the impacts of plastics is fundamental. However, bioplastics can result in a misunderstanding about their properties and environmental impacts, as well as incorrect management of their final disposition, from misidentifications and classifications. This chapter addresses the aspects and factors surrounding the biodegradation of bioplastics from natural (plant biomass (starch, lignin, cellulose, hemicellulose, and starch) and bacterial polyester polymers. Therefore, the biodegradation of bioplastics is a factor that must be studied, because due to the increase in the production of different bioplastics, they may present differences in the decomposition rates.

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Chang, Rong-Kun, and James C. Price. "Aliphatic Polyesters and Cellulose-Based Polymers for Controlled Release Applications." Journal of Biomaterials Applications 3, no. 1 (January 1988): 80–101. http://dx.doi.org/10.1177/088532828800300104.

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Berketova, L., and V. Polkovnikova. "On the Eco-, Edible and Fast-decomposing Packaging in the Food Industry." Bulletin of Science and Practice 6, no. 10 (October 15, 2020): 234–43. http://dx.doi.org/10.33619/2414-2948/59/23.

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At the moment, all economically developed countries face the problem of pollution of the surrounding world, and one of the main pollutants is packaging. Packaging helps to preserve its contents from various damages, and informative and attractive packaging is an indispensable attribute of the marketing process. Most products are Packed in a huge amount of film and paper, which is thrown out by the consumer to the landfill. As a result, there are growing landfills for garbage, 40 % of which is disposable packaging. In the conditions of increased demand for so-called healthy food products, the question of packaging this food in no less "healthy" packaging arose. Eco-friendly, biodegradable, and edible packaging is one of the relatively new trends in the field of ecology. The international standard ASTM D-6400 "Standard specification for marking plastics intended for aerobic composting in municipal or industrial facilities" regulates the development of bioplastic mass technologies. According to the Standard specification for compostable plastics, biodegradable and decomposable plastics are classified into the following groups: starch, cellulose and protein based plastics; aliphatic polyesters; polylactic acids; polytrihydroxybutyrate; polyhydroxalkanoates; bio-derived polyethylene and lipid-derived polymers. According to the method of decomposition, bioplastics are divided into compostable plastic and photo-degradable plastics. The range of biodegradable plastics includes: starch; natural polyesters; renewable resource polyesters; synthetic aliphatic polyesters; aliphatic-aromatic co-polyesters; hydro-biodegradable polyester; water-soluble polymers; photo-biodegradable plastics and controlled degradation of dietary supplements. In the Russian Federation, the issues of bioplastic production have not been developed and are not legally fixed. Today, the main types of edible packaging include natural casings for meat products, wafer cups for ice cream, craft paper, cardboard, wood, cellulose, and others. Jute bags are a potential biodegradable packaging material. Many companies produce modern disposable eco-friendly dishes made of wood, bamboo, carbonized bamboo, sugar cane and other eco-friendly materials without the use of chemicals.

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Matos, Marina, Andreia F. Sousa, Nuno H. C. S. Silva, Carmen S. R. Freire, Márcia Andrade, Adélio Mendes, and Armando J. D. Silvestre. "Furanoate-Based Nanocomposites: A Case Study Using Poly(Butylene 2,5-Furanoate) and Poly(Butylene 2,5-Furanoate)-co-(Butylene Diglycolate) and Bacterial Cellulose." Polymers 10, no. 8 (July 24, 2018): 810. http://dx.doi.org/10.3390/polym10080810.

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Polyesters made from 2,5-furandicarboxylic acid (FDCA) have been in the spotlight due to their renewable origins, together with the promising thermal, mechanical, and/or barrier properties. Following the same trend, (nano)composite materials based on FDCA could also generate similar interest, especially because novel materials with enhanced or refined properties could be obtained. This paper presents a case study on the use of furanoate-based polyesters and bacterial cellulose to prepare nanocomposites, namely acetylated bacterial cellulose/poly(butylene 2,5-furandicarboxylate) and acetylated bacterial cellulose/poly(butylene 2,5-furandicarboxylate)-co-(butylene diglycolate)s. The balance between flexibility, prompted by the furanoate-diglycolate polymeric matrix; and the high strength prompted by the bacterial cellulose fibres, enabled the preparation of a wide range of new nanocomposite materials. The new nanocomposites had a glass transition between −25–46 °C and a melting temperature of 61–174 °C; and they were thermally stable up to 239–324 °C. Furthermore, these materials were highly reinforced materials with an enhanced Young’s modulus (up to 1239 MPa) compared to their neat copolyester counterparts. This was associated with both the reinforcing action of the cellulose fibres and the degree of crystallinity of the nanocomposites. In terms of elongation at break, the nanocomposites prepared from copolyesters with higher amounts of diglycolate moieties displayed higher elongations due to the soft nature of these segments.

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Sommer, Korbinian, Daniel Van Opdenbosch, and Cordt Zollfrank. "Synthesis and Characterization of Functional Cellulose–Ether-Based PCL- and PLA-Grafts-Copolymers." Polymers 15, no. 2 (January 15, 2023): 455. http://dx.doi.org/10.3390/polym15020455.

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The use of biodegradable materials such as cellulose and polyesters can be extended through the combination, as well as modification, of these biopolymers. By controlling the molecular structure and composition of copolymers of these components, it should also be possible to tailor their material properties. We hereby report on the synthesis and characterization of cellulose-based graft copolymers with a precise molecular composition and copolymer architecture. To prepare such materials, we initially modified cellulose through the regioselective protection of the 6-OH group using trityl chloride. The 6-O protected compound was then alkylated, and deprotection at the 6-OH group provided the desired 2,3-di-O-alkyl cellulose compounds that were used as macroinitiators for ring opening polymerization. Regioselective modification was hereby necessary to obtain compounds with an exact molecular composition. Ring opening polymerization, catalyzed by Sn(Oct)2, at the primary 6-OH group of the cellulose macroinitiator, using L-lactide or ε-caprolactone, resulted in graft copolymers with the desired functionalization pattern. The materials were characterized using Fourier-transform infrared spectroscopy, 1H- and 13C- nuclear magnetic resonance spectroscopy, size exclusion chromatography as well as X-ray diffraction, and differential scanning calorimetry. PCL-based copolymers exhibited distinct melting point as well as a crystalline phase of up to 47%, while copolymers with PLA segments were highly amorphous, showing a broad amorphous reflex in the XRD spectra, and no melting or crystallization points were discernible using differential scanning calorimetry.

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Wang, Yuhuan, Jinglu Liao, Jun Lu, Zhaoshu Chen, Shanjun Gao, Lin Gan, and Jin Huang. "Regulating surface molecular structure of cellulose nanocrystals to optimize mechanical reinforcement effect on hydrophobic bio-based polyesters." Iranian Polymer Journal 29, no. 8 (June 25, 2020): 693–705. http://dx.doi.org/10.1007/s13726-020-00832-6.

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Di Bella, Gaetano, Santo Fabio Corsino, Federica De Marines, Francesco Lopresti, Vincenzo La Carrubba, Michele Torregrossa, and Gaspare Viviani. "Occurrence of Microplastics in Waste Sludge of Wastewater Treatment Plants: Comparison between Membrane Bioreactor (MBR) and Conventional Activated Sludge (CAS) Technologies." Membranes 12, no. 4 (March 29, 2022): 371. http://dx.doi.org/10.3390/membranes12040371.

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In this study, the presence of microplastics in the sludge of three wastewater treatment plants (WWTPs) was examined. The investigated WWTPs operated based on a conventional activated sludge (CAS) process, with (W1) or without (W2) primary clarification, and a membrane bioreactor process (MBR) (W3). The microplastics (MPs) concentration in the samples of W3 was approximately 81.1 ± 4.2 × 103 particles/kg dry sludge, whereas MPs concentrations in W1 and W2 were 46.0 ± 14.8 × 103 particles/kg dry sludge and 36.0 ± 5.2 × 103 particles/kg dry sludge, respectively. Moreover, MPs mainly consisted of fragments (66–68%) in the CAS plants, whereas the fractions of MPs shapes in the MBR sludge were more evenly distributed, although fiber (47%) was the most abundant fraction. Furthermore, samples from the MBR showed a greater diversity in MPs composition. Indeed, all the main polyesters (i.e., textile fibers and polyethylene terephthalate), polyolefins (i.e., polyethylene and polypropylene) and rubber (i.e., polybutadiene) were observed, whereas only polybutadiene, cellulose acetate and polyester were detected in the CAS plants. These findings confirmed that MPs from wastewater are transferred and concentrated in the waste sludge. This is a critical finding since sludge disposal could become a new pathway for microplastic release into the environment and because MPs might affect the fouling behavior of the membrane.

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Valvez, Sara, Alberto Maceiras, Paulo Santos, and Paulo N. B. Reis. "Olive Stones as Filler for Polymer-Based Composites: A Review." Materials 14, no. 4 (February 10, 2021): 845. http://dx.doi.org/10.3390/ma14040845.

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Olives’ consumption produces copious agricultural byproducts that have accompanied humanity for millennia, but the increasing worldwide production complicates its management. Most wastes are generated during olive oil production in form of olive stones and other lignocellulosic derivatives. Industrial processes of chemical or physical nature to recover economically compounds from biomass residues are costly, difficult, and non-environmentally friendly. Cellulose, hemicellulose, and lignin biopolymers are the principal components of olive stones, which present interesting qualities as lignocellulosic fillers in polymeric composites. This review will summarize examples of composites based on thermoplastic polymers, such as polystyrene (PS), polylactide (PLA), polyvinyl chloride (PVC), polypropylene (PP), and polycaprolactone (PCL); thermosetting resins (phenol-formaldehyde, unsaturated polyesters, and epoxy) and acrylonitrile butadiene rubber/devulcanized waste rubber (NBR/DWR) blends focusing on the fabrication procedures, characterization, and possible applications. Finally, thanks to the wide disparity in polymer matrix types, the variability in applications is important, from adsorption to mechanical enhancement, showing the easiness and benefit of olive stone integration in many materials.

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Diot-Néant, F., L. M. M. Mouterde, J. Couvreur, F. Brunois, S. A. Miller, and F. Allais. "Green synthesis of 2-deoxy-D-ribonolactone from cellulose-derived levoglucosenone (LGO): A promising monomer for novel bio-based polyesters." European Polymer Journal 159 (October 2021): 110745. http://dx.doi.org/10.1016/j.eurpolymj.2021.110745.

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Parente, Joana Filipa, Vânia Isabel Sousa, Juliana Filipa Marques, Marta Adriana Forte, and Carlos José Tavares. "Biodegradable Polymers for Microencapsulation Systems." Advances in Polymer Technology 2022 (February 14, 2022): 1–43. http://dx.doi.org/10.1155/2022/4640379.

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Environmentally friendly alternatives have become sought after upon the development of scientific research and industrial processes. Recent trends suggest biodegradable polymers as the most promising solution for synthetic microcapsule systems. Safety, efficiency, biocompatibility, and biodegradability are some of the properties that biodegradable systems in microencapsulation can provide for a broad spectrum of applications. The controlled release of encapsulated active agents is a research field that, over the years, has been constantly innovating due to the promising applications in the areas of pharmaceutical, cosmetic, textile industry, among others. This article presents an overview of different polymers with potential for microcapsule synthesis, namely, biodegradable polymers. First, natural polymers are discussed, which are divided into two categories: polysaccharide-based polymers (cellulose, starch, chitosan, and alginate) and protein polymers (gelatin). Second, synthetic polymers are described, where biodegradable polymers such as polyesters, polyamides, among others appear as examples. For each polymer, this review presents its origin, relevant properties, applications, and examples found in the literature regarding its use in biodegradable microencapsulation systems.

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Jasiukaitytė-Grojzdek, Edita, Filipa A. Vicente, Miha Grilc, and Blaž Likozar. "Ambient-Pressured Acid-Catalysed Ethylene Glycol Organosolv Process: Liquefaction Structure–Activity Relationships from Model Cellulose–Lignin Mixtures to Lignocellulosic Wood Biomass." Polymers 13, no. 12 (June 17, 2021): 1988. http://dx.doi.org/10.3390/polym13121988.

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Raising the awareness of carbon dioxide emissions, climate global warming and fossil fuel depletion has renewed the transition towards a circular economy approach, starting by addressing active bio-economic precepts that all portion amounts of wood are valorised as products. This is accomplished by minimizing residues formed (preferably no waste materials), maximizing reaction productivity yields, and optimising catalysed chemical by-products. Within framework structure determination, the present work aims at drawing a parallel between the characterisation of cellulose–lignin mixture (derived system model) liquefaction and real conversion process in the acidified ethylene glycol at moderate process conditions, i.e., 150 °C, ambient atmospheric pressure and potential bio-based solvent, for 4 h. Extended-processing liquid phase is characterized considering catalyst-transformed reactant species being produced, mainly recovered lignin-based polymer, by quantitative 31P, 13C and 1H nuclear magnetic resonance (NMR) spectroscopy, as well as the size exclusion- (SEC) or high performance liquid chromatography (HPLC) separation for higher or lower molecular weight compound compositions, respectively. Such mechanistic pathway analytics help to understand the steps in mild organosolv biopolymer fractionation, which is one of the key industrial barriers preventing a more widespread manufacturing of the biomass-derived (hydroxyl, carbonyl or carboxyl) aromatic monomers or oligomers for polycarbonates, polyesters, polyamides, polyurethanes and (epoxy) resins.

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Blanco, Francisco G., Natalia Hernández, Virginia Rivero-Buceta, Beatriz Maestro, Jesús M. Sanz, Aránzazu Mato, Ana M. Hernández-Arriaga, and M. Auxiliadora Prieto. "From Residues to Added-Value Bacterial Biopolymers as Nanomaterials for Biomedical Applications." Nanomaterials 11, no. 6 (June 4, 2021): 1492. http://dx.doi.org/10.3390/nano11061492.

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Bacterial biopolymers are naturally occurring materials comprising a wide range of molecules with diverse chemical structures that can be produced from renewable sources following the principles of the circular economy. Over the last decades, they have gained substantial interest in the biomedical field as drug nanocarriers, implantable material coatings, and tissue-regeneration scaffolds or membranes due to their inherent biocompatibility, biodegradability into nonhazardous disintegration products, and their mechanical properties, which are similar to those of human tissues. The present review focuses upon three technologically advanced bacterial biopolymers, namely, bacterial cellulose (BC), polyhydroxyalkanoates (PHA), and γ-polyglutamic acid (PGA), as models of different carbon-backbone structures (polysaccharides, polyesters, and polyamides) produced by bacteria that are suitable for biomedical applications in nanoscale systems. This selection models evidence of the wide versatility of microorganisms to generate biopolymers by diverse metabolic strategies. We highlight the suitability for applied sustainable bioprocesses for the production of BC, PHA, and PGA based on renewable carbon sources and the singularity of each process driven by bacterial machinery. The inherent properties of each polymer can be fine-tuned by means of chemical and biotechnological approaches, such as metabolic engineering and peptide functionalization, to further expand their structural diversity and their applicability as nanomaterials in biomedicine.

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Paulauskiene, Tatjana, Audrone Teresiute, Jochen Uebe, and Arturas Tadzijevas. "Sustainable Cross-Linkers for the Synthesis of Cellulose-Based Aerogels: Research and Application." Journal of Marine Science and Engineering 10, no. 4 (April 2, 2022): 491. http://dx.doi.org/10.3390/jmse10040491.

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Cellulose aerogels with polyester resin as cross-linkers have attracted much attention. This study describes the route to produce a fully bio-based aerogel with high added value from waste paper and starch, cellulose acetate and starch–cellulose acetate mixture as cross-linkers for oil adsorption, instead of the environmentally harmful polyester resin. The manufacturing process is simple, sustainable and cost-efficient, without releasing harmful by-products into the environment. The effects of different cross-linkers on the oil adsorption, dynamic oil retention, reusability and morphology of the aerogels were studied in detail. Experimental results show that these environmentally friendly recycled aerogels have a very low density, i.e., —0.0110–0.0209 g cm−3, and highly porous structures, with a porosity of 96.74–99.18%. The synthesized hydrophobic aerogels showed contact angles of ∼124–129°. The compression moduli are lower than that of an aerogel with polyester as a cross-linker, but the compression modulus of the mixture of starch and cellulose acetate especially shows a higher value than expected. The sorption capacity of the aerogels with bio-based cross-linkers was significantly increased compared to the aerogels with polyester; it is now up to 56 times their own weight. The aerogels also have good oil-retention properties.

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Radu, Elena-Ruxandra, Denis Mihaela Panaitescu, Augusta Raluca Gabor, Cristian Andi Nicolae, and Adriana Nicoleta Frone. "Bio-Based Polyester/Cellulose Films for Engineering Applications." Proceedings 57, no. 1 (November 11, 2020): 36. http://dx.doi.org/10.3390/proceedings2020057036.

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Dutta, Geeti Kaberi, and Niranjan Karak. "Waste brewed tea leaf derived cellulose nanofiber reinforced fully bio-based waterborne polyester nanocomposite as an environmentally benign material." RSC Advances 9, no. 36 (2019): 20829–40. http://dx.doi.org/10.1039/c9ra02973g.

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Guizani, Chamseddine, Mikaela Trogen, Hilda Zahra, Leena Pitkänen, Kaniz Moriam, Marja Rissanen, Mikko Mäkelä, Herbert Sixta, and Michael Hummel. "Fast and quantitative compositional analysis of hybrid cellulose-based regenerated fibers using thermogravimetric analysis and chemometrics." Cellulose 28, no. 11 (May 28, 2021): 6797–812. http://dx.doi.org/10.1007/s10570-021-03923-6.

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AbstractCellulose can be dissolved with another biopolymer in a protic ionic liquid and spun into a bicomponent hybrid cellulose fiber using the Ioncell® technology. Inside the hybrid fibers, the biopolymers are mixed at the nanoscale, and the second biopolymer provides the produced hybrid fiber new functional properties that can be fine-tuned by controlling its share in the fiber. In the present work, we present a fast and quantitative thermoanalytical method for the compositional analysis of man-made hybrid cellulose fibers by using thermogravimetric analysis (TGA) in combination with chemometrics. First, we incorporated 0–46 wt.% of lignin or chitosan in the hybrid fibers. Then, we analyzed their thermal decomposition behavior in a TGA device following a simple, one-hour thermal treatment protocol. With an analogy to spectroscopy, we show that the derivative thermogram can be used as a predictor in a multivariate regression model for determining the share of lignin or chitosan in the cellulose hybrid fibers. The method generated cross validation errors in the range 1.5–2.1 wt.% for lignin and chitosan. In addition, we discuss how the multivariate regression outperforms more common modeling methods such as those based on thermogram deconvolution or on linear superposition of reference thermograms. Moreover, we highlight the versatility of this thermoanalytical method—which could be applied to a wide range of composite materials, provided that their components can be thermally resolved—and illustrate it with an additional example on the measurement of polyester content in cellulose and polyester fiber blends. The method could predict the polyester content in the cellulose-polyester fiber blends with a cross validation error of 1.94 wt.% in the range of 0–100 wt.%. Finally, we give a list of recommendations on good experimental and modeling practices for the readers who want to extend the application of this thermoanalytical method to other composite materials.

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Wang, Dong, and Gang Sun. "Novel polymer blends from polyester and bio-based cellulose ester." Journal of Applied Polymer Science 119, no. 4 (August 31, 2010): 2302–9. http://dx.doi.org/10.1002/app.32903.

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Dolez, Patricia I., Sabrina Marsha, and Rachel H. McQueen. "Fibers and Textiles for Personal Protective Equipment: Review of Recent Progress and Perspectives on Future Developments." Textiles 2, no. 2 (June 13, 2022): 349–81. http://dx.doi.org/10.3390/textiles2020020.

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This article reviews recent developments in fibers and textiles for Personal Protective Equipment (PPE) applications. Fibers are grouped into six categories: highly extensible elastomeric fibers, cellulose-based fibers, commodity synthetic fibers, high strength inorganic materials, and high performance polymer fibers. New developments with highly extensible elastomeric fibers include polyester-based elastic fibers and shape memory polyurethane. In the case of cellulose-based fibers, environmentally friendly processes and nanotechnology-enabling treatments are developed for natural fibers where attempts are made to transfer interesting attributes of the feedstock to regenerated cellulose fibers. Commodity synthetic fibers comprise polyolefins, polyester, and polyamide; they have seen recent developments in terms of surface functionalization and the formation of structures at the nanoscale. In terms of high strength inorganic materials, basalt fibers and carbonaceous materials have found increased use in PPE. Boron is also generating considerable interest for fibers and coatings. Research on high-performance polymer fibers includes further improving their short- and long-term performance, moving to the nanoscale for new functionalities, and exploring their recyclability. An additional section describes a series of special textile structures relevant to PPE involving 3D textile structures, auxetic textile structures, shear thickening fabrics, nanoporous structures, phase change materials, and some specially designed textile-based composite structures for improved protection against mechanical hazards. The article ends with some perspectives on promising avenues for further developments.

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Hernandez Pinson, Ana Maria, Aleksey Fedorovich Maksimov, Anastasiya Aleksandrovna Zhukova, Dariya Aleksandrovna Kudryashova, Kseniya Sergeyevna Momzyakova, Marianna Petrovna Kutyreva, Alfiya Rinatovna Gataulina, and Gennadiy Andreyevich Kutyrev. "POLYDENTATE ADSORBENT BASED ON LINEN CELLULOSE MODIFIED BY HYPERBRANCHED POLYESTER POLYBENZOYLTHIOCARBAMATE." chemistry of plant raw material, no. 2 (June 10, 2021): 79–85. http://dx.doi.org/10.14258/jcprm.2021027503.

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A highly efficient hybrid adsorbent based on an industrially available, biodegradable, non-toxic linencellulose modified with hyperbranched polyesterpolybenzoylthiocarbamate has been synthesized.The synthesis was carried out using as a linkertoluene diisocyanate.The second-generation hyperbranched polyesterpolybenzoylthiocarbamate according to 1H, 13C NMR and IR spectroscopy contains 8 terminal benzoylthiocarbamate and 8 hydroxyl groups.In the first stage, the reaction of toluene diisociant with linen cellulose was carried out. By potentiometric titration, the content of toluene diisociant was found to be 27%. Then, hyperbranched polyesterpolybenzoylthiocarbamate was added to the modified linen cellulose. The content of hyperbranched polymer in cellulose, determined by the weight method, is 5%. Unreacted isocyanate groups are neutralized with isobutyl alcohol. The structure of the hybrid material is proven by IR spectroscopy. The adsorption properties of the polydentate adsorbent were studied with respect to Cu(II) ions. It was found that the adsorption capacity of the adsorbent is 6.93 mg/g. Using DSC and TGA analysis, the temperature characteristics, thermal effects, and mass loss of the obtained polydentate compound and its complexes were determined.It was shown that in an acidic medium at pH 3-4, desorption of Cu (II) and Co (II) ions occurs with the regeneration of a hybrid adsorbent.

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Hernandez, A. M. P., A. F. Maksimov, A. A. Zhukova, D. A. Kudryashova, K. S. Momzyakova, M. P. Kutyreva, A. R. Gataulina, and G. A. Kutyrev. "Polydentate Adsorbent Based on Flax Cellulose Modified by Hyperbranched Polyester Polybenzoylthiocarbamate." Russian Journal of Bioorganic Chemistry 48, no. 7 (December 2022): 1399–404. http://dx.doi.org/10.1134/s1068162022070056.

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Parvathy, S. U., S. Hema, Malavika Sajith, Rashid Sulthan, C. Sreelekshmi, Sreedha Sambhudevan, and Balakrishnan Shankar. "A Review on Barrier Properties of Nanocellulose and Polylactic acid Composites." IOP Conference Series: Materials Science and Engineering 1258, no. 1 (October 1, 2022): 012017. http://dx.doi.org/10.1088/1757-899x/1258/1/012017.

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Bio-based polymers, which are environmentally benign and contribute to a range of applications, are in great demand right now. The relevance of nanocellulose polylactic acid polymers, their benefits, production processes, and the wide variety of applications given by their barrier property are highlighted in this paper. Cellulose can be defined as the final product obtained as a result of biosynthesis of plants, animals, or bacteria, and nanocellulose refers to cellulosic take-outs or materials with definite nanoscale structural dimensions. Poly (lactic acid) or polylactide (PLA) is a thermoplastic polyester, which has the ability to replace petrochemical based polymers. Poly (lactic acid), often known as polylactide (PLA), is a thermoplastic polyester that can replace petrochemical-based polymers

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Aid, Tiina, Mihkel Koel, Margus Lopp, and Merike Vaher. "Metal-Catalyzed Degradation of Cellulose in Ionic Liquid Media." Inorganics 6, no. 3 (August 10, 2018): 78. http://dx.doi.org/10.3390/inorganics6030078.

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Biomass conversion to 5-hydroxymethylfurfural (HMF) has been widely investigated as a sustainable alternative to petroleum-based feedstock, since it can be efficiently converted to fuel, plastic, polyester, and other industrial chemicals. In this report, the degradation of commercial cellulose, the isomerization of glucose to fructose, and the conversion of glucose to HMF in 1-butyl-3-methylimidazolium chloride ([BMIM]Cl]) using metal catalysts (CrCl3, ZnCl2, MgCl2) as well as tungsten and molybdenum oxide-based polyoxometalates (POM) were investigated. Tungsten and molybdenum oxide-based POMs in ionic liquids (IL) were able to degrade cellulose to majority glucose and epimerize glucose to mannose (in the case of the molybdenum oxide-based POM). A certain amount of glucose was also converted to HMF. The tungsten oxide-based POM in IL showed good activity for cellulose degradation but the overall products yield remained 28.6% lower than those obtained using CrCl3 as a catalyst. Lowering the cellulose loading did not significantly influence the results and the addition of water to the reaction medium decreased the product yields remarkably.

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Li, Junran, Fen Yin, Dongna Li, Xiaojun Ma, and Jiao Zhou. "Mechanical, thermal, and barrier properties of PHBH/cellulose biocomposite films prepared by the solution casting method." BioResources 14, no. 1 (December 20, 2018): 1219–28. http://dx.doi.org/10.15376/biores.14.1.1219-1228.

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A biocomposite film from bacterial polyester, poly(3- hydroxybutyrate-co-3-hydroxyhexanoate) (PHBH), and natural cellulose was developed by the solution casting method. The structure, the mechanical, thermal, and barrier properties (oxygen and water vapor), and the biodegradation of the PHBH/cellulose biocomposite films were studied. With an increase in cellulose content, the tensile strength of biocomposite films increased from 28.5 MPa to 45.9 MPa, an improvement of 351% compared with neat PHBH. The PHBH/cellulose biocomposite films exhibited improved thermal stability, with the maximum thermal decomposition temperature increased from 264 °C to 330 °C. More importantly, PHBH/cellulose biocomposite films possessed better barrier properties against oxygen, up to approximately 10 times more than neat PHBH. With cellulose content increased from 50 wt% to 90 wt%, the mass loss of composite films increased gradually and then decreased. This high performance biocomposite has potential to expand the use of cellulose from renewable bioresources and the practical application of PHBH-based biodegradable plastics instead of traditional petrochemical materials in the packaging field.

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Wang, Siyan, and Sonja Salmon. "Progress toward Circularity of Polyester and Cotton Textiles." Sustainable Chemistry 3, no. 3 (September 5, 2022): 376–403. http://dx.doi.org/10.3390/suschem3030024.

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Millions of tons of textile waste are landfilled or incinerated in the world every year due to insufficient recycle value streams and the complex composition of textile end products. The goal of this review is to highlight pathways for simplifying and separating textile wastes into valuable raw material streams that will promote their recovery and conversion to useful products. The discussion focuses on advances in sorting, separation, decolorization and conversion of polyester and cotton, the two most common textile fibers. Sorting processes are gaining automation using spectroscopic methods that detect chemical composition differences between materials to divide them into categories. Separation, through dissolving or degrading, makes it possible to deconstruct blended textiles and purify polymers, monomers and co-products. Waste cotton can produce high quality regenerated cellulose fibers, cellulose nanocrystals (CNCs) or biofuels. Waste polyester can produce colored yarns or can be chemically converted to its starting monomers for the recreation of virgin polymer as a complete closed loop. The current strategies for decolorization are presented. Life cycle assessment (LCA) studies found that recycling polyester/cotton blended fabrics for subsequent uses is more sustainable than incineration, and research on producing biomass-based poly-ester also offers feasible avenues for improving textile sustainability and promoting circular processing.

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Martínez-Barrera, Gonzalo, Miguel Martínez-López, Nelly González-Rivas, Juan Jose del Coz-Diaz, Liliana Ávila-Córdoba, João Marciano Laredo dos Reis, and Osman Gencel. "Recycled cellulose from Tetra Pak packaging as reinforcement of polyester based composites." Construction and Building Materials 157 (December 2017): 1018–23. http://dx.doi.org/10.1016/j.conbuildmat.2017.09.181.

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Ansari, Farhan, Mikael Skrifvars, and Lars Berglund. "Nanostructured biocomposites based on unsaturated polyester resin and a cellulose nanofiber network." Composites Science and Technology 117 (September 2015): 298–306. http://dx.doi.org/10.1016/j.compscitech.2015.07.004.

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Mousa, Ahmad, Gert Heinrich, Udo Wagenknecht, and Dieter Jehnichen. "Utilization of cellulose based agro-waste as reinforcement for unsaturated polyester composites." International Journal of Plastics Technology 20, no. 2 (June 9, 2016): 203–18. http://dx.doi.org/10.1007/s12588-016-9149-0.

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Chabros, Artur, Barbara Gawdzik, Beata Podkościelna, Marta Goliszek, and Przemysław Pączkowski. "Composites of Unsaturated Polyester Resins with Microcrystalline Cellulose and Its Derivatives." Materials 13, no. 1 (December 21, 2019): 62. http://dx.doi.org/10.3390/ma13010062.

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The paper investigates the properties of unsaturated polyester resins and microcrystalline cellulose (MCC) composites. The influence of MCC modification on mechanical, thermomechanical, and thermal properties of obtained materials was discussed. In order to reduce the hydrophilic character of the MCC surface, it was subjected to esterification with the methacrylic anhydride. This resulted in hydroxyl groups blocking and, additionally, the introduction of unsaturated bonds into its structure, which could participate in copolymerization with the curing resin. Composites of varying amounts of cellulose as a filler were obtained from modified MCC and unmodified (comparative) MCC. The modification of MCC resulted in obtaining composites characterized by greater flexural strength and strain at break compared with the analogous composites based on the unmodified MCC.

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Juikham, S., A. J. Amass, and B. J. Tighe. "Novel Three-Component Blends Based on Poly(L-Lactide)." Advanced Materials Research 55-57 (August 2008): 737–40. http://dx.doi.org/10.4028/www.scientific.net/amr.55-57.737.

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A significant number of poly a-ester homologues of poly(L-lactide) (PLLA) have been synthesized and used in miscibility studies together with conventional isomeric diacid-diol polyester variants, poly β-esters (based on β-hydroxybutyrate (HB) and β-hydroxyvalerate (HV)), poly e-caprolactone (PCL), poly e-caprolactone copolymers (e.g. poly(L-lactide-co-caprolactone), and a series of cellulose-based polymers (e.g. cellulose acetate butyrate (CAB), cellulose acetate propionate (CAP)). A combinatorial approach to rapid miscibility screening using 96-well plates and a uv-visible multi-wavelength plate reader has been developed enabling the clarity of PLLA-based multi-component blend films to be observed. Using these techniques and materials, the ternary phase compatibility diagrams of a range of three-component blend films was prepared, illustrating ranges of behavior varying from miscible blends giving rise to clear films to immiscible blends which are opaque. In this way, novel three-component blends of PLLA/CAB/PCL were developed which are miscible when the CAB content is more than 30%, PLLA less than 80% and PCL less than 60%.

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Chen, Ying, Lingling Tian, Jiatong Ju, and Jintian Tang. "Electrically conductive polyester and cellulose based composites: fabrication, characterization and in vitro biocompatibility." Journal of The Textile Institute 109, no. 9 (January 3, 2018): 1238–46. http://dx.doi.org/10.1080/00405000.2017.1423002.

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Charpentier, Paul A., Anne Maguire, and Wan-kei Wan. "Surface modification of polyester to produce a bacterial cellulose-based vascular prosthetic device." Applied Surface Science 252, no. 18 (July 2006): 6360–67. http://dx.doi.org/10.1016/j.apsusc.2005.09.064.

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Ahmadizadegan, Hashem, and Sheida Esmaielzadeh. "Gas transport membranes based on novel optically active polyester/cellulose/ZnO bionanocomposite membranes." Journal of the Iranian Chemical Society 15, no. 4 (December 26, 2017): 799–811. http://dx.doi.org/10.1007/s13738-017-1279-6.

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Aubert, Michelle. "Materials Issues in Film Archiving: A French Experience." MRS Bulletin 28, no. 7 (July 2003): 506–10. http://dx.doi.org/10.1557/mrs2003.147.

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AbstractThe following article is based on a presentation given as part of Symposium X—Frontiers of Materials Research on December 4, 2002, at the 2002 Materials Research Society Fall Meeting. The cinema is just over 100 years old. From the beginning of motion pictures in the mid-1890s, the materials used for films have been at the heart of cinema technology. The material first used was cellulose nitrate film—unrivaled in its mechanical, physical, and aesthetic qualities, and also dangerously flammable. In the 1950s, cellulose nitrate was replaced, for safety reasons, by cellulose triacetate. Today, polyester film is widely used; nevertheless, the fact remains that the majority of the world's film heritage exists on two main material formats, cellulose nitrate and cellulose triacetate, both of which decay over time. Film archivists are engaged in a race to save historic film footage from being lost forever. Digital technology, now widely used in cinema, does not resolve the issue of the long-term preservation of films because digital formats are still evolving. This article discusses the materials used in motion-picture technology over the years, the mechanisms active in film decomposition, and international efforts to preserve and restore historic films.

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MOKHTARI, JAVAD, and MOTAHAREH KANAFCHIAN. "CELLULOSE/WOLLASTONITE BASED GREEN MEMBRANES USING RICE STRAW: FABRICATION AND CHARACTERIZATION." Cellulose Chemistry and Technology 56, no. 3-4 (May 5, 2022): 361–70. http://dx.doi.org/10.35812/cellulosechemtechnol.2022.56.32.

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Cellulose/wollastonite membranes were prepared with an environmentally friendly process using N-methylmorpholine-N-oxide (NMMO), which resulted in mesoporous membranes with slit-shaped pores. Cellulose and wollastonite were extracted from rice straw with different methods. Some parameters, such as weight ratios of cellulose and wollastonite in solution, concentration, thickness of the cast solution on the support layer and porosity of the support layer, influence the formation of the porous cellulose/wollastonite membrane. It was concluded that the porosity and pore size of the cellulose/wollastonite membrane decreased with lower cellulose and higher wollastonite amounts. The membranes became more brittle by increasing the amount of wollastonite, while pure cellulose membranes did not have enough strength to be placed on the polyester support layer. Also, the concentration of cellulose should not be too high or too low. The thickness of the cast solution on the support layer should not be too high, as it reduces the porosity; on the other hand, low thickness reduces the performance of the membrane.

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Stepanova, Mariia, Ilia Averianov, Mikhail Serdobintsev, Iosif Gofman, Natalya Blum, Natalya Semenova, Yuliya Nashchekina, et al. "PGlu-Modified Nanocrystalline Cellulose Improves Mechanical Properties, Biocompatibility, and Mineralization of Polyester-Based Composites." Materials 12, no. 20 (October 21, 2019): 3435. http://dx.doi.org/10.3390/ma12203435.

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The development of biocompatible composite materials is in high demand in many fields such as biomedicine, bioengineering, and biotechnology. In this study, two series of poly (D,L-lactide) and poly (ε-caprolactone)-based films filled with neat and modified with poly (glutamic acid) (PGlu) nanocrystalline cellulose (NCC) were prepared. An analysis of scanning electron and atomic force microscopies’ results shows that the modification of NCC with poly (glutamic acid) favored the better distribution of the nanofiller in the polymer matrix. Investigating the ability of the developed materials to attract and retain calcium ions led to the conclusion that composites containing NCC modified with PGlu induced better mineralization from model solutions than composites containing neat NCC. Moreover, compared to unmodified NCC, functionalization with PGlu improved the mechanical properties of composite films. The subcutaneous implantation of these composite materials into the backs of rats and the further histological investigation of neighboring tissues revealed the better biocompatibility of polyester materials filled with NCC–PGlu.

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Septevani, Athanasia A., David A. C. Evans, Darren J. Martin, and Pratheep K. Annamalai. "Hybrid polyether-palm oil polyester polyol based rigid polyurethane foam reinforced with cellulose nanocrystal." Industrial Crops and Products 112 (February 2018): 378–88. http://dx.doi.org/10.1016/j.indcrop.2017.12.032.

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Karthikeyan, S. "Influence of fibre loading and surface treatment on the impact strength of coir polyester composites." Archives of Materials Science and Engineering 1, no. 107 (January 3, 2021): 16–20. http://dx.doi.org/10.5604/01.3001.0014.8190.

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Purpose: In this work, coir fibre with varying fibre content was selected as reinforcements to prepare polymer-based matrices and the problem of reduced fibre-matrix interfacial bond strength has been diluted by chemical treatment of coir fibres with alkali solution. Design/methodology/approach: The effect of fibre loading, solution concentration and soaking time on the impact strength of the composites were analyzed using statistical techniques. Response Surface Methodology (RSM) approach was used to model and optimize the impact properties of coir-polyester composites. Findings: The impact strength of coir fibre reinforced polyester composite depends mainly on the fabrication parameters such as fibre-polyester content, soaking time, concentration of soaking agent and adhesive interaction between the fibre and reinforcement. Research limitations/implications: The mechanical properties of any coir polyester composite depend on the nature bonding between the fibre and reinforcement. The presence of cellulose, lignin on the periphery of any natural fibre reduces the bonding strength of the composite. This limitation is overcome by fibre treatment over sodium hydroxide to have better impact properties. Practical implications: Now days, natural fibre reinforced composites are capable of replacing automotive parts, subjected to static loads such as engine Guard, light doom, name plate, tool box and front panels etc. These materials can withstand any static load due to its higher strength to weight ratios. Originality/value: The effect of fibre loading, solution concentration and soaking time on the impact strength of the composites were analyzed using statistical techniques. Response Surface Methodology (RSM) approach was used to model and optimize the impact properties of coir-polyester composites. The impact strength of NaOH impregnated coir fibre reinforced polyester composites was evaluated.

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Estupiñán Méndez, Diego, and Thorsten Allscher. "Advantages of External Reflection and Transflection over ATR in the Rapid Material Characterization of Negatives and Films via FTIR Spectroscopy." Polymers 14, no. 4 (February 19, 2022): 808. http://dx.doi.org/10.3390/polym14040808.

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The identification of film support material is of utmost importance for evidence-based collection management in cultural heritage institutions, especially the identification of cellulose nitrate for fire safety reasons, as nitrate is highly flammable and deteriorates over time. Cellulose nitrate film was used by photographers and movie filmmakers from its release in the 1880s to the 1950s. Cellulose acetate, being called safety film, gradually began to replace cellulose nitrate, as it is not flammable. Despite its non-flammable properties, cellulose acetate also deteriorates in hazardous ways. Therefore, identification of cellulose nitrate and cellulose acetate in collections is imperative for preservation and risk management to collections and humans. Large photographic collections can easily contain several thousand negatives or more, so a rapid, non-invasive and reliable method is needed. Traditional identification methods, such as destructive chemical tests, are sometimes unreliable, and spectroscopic analyses are normally time-consuming. To overcome these issues, rapid material characterization was performed in transflection mode with a Fourier-transform infrared (FTIR) spectrometer equipped with an external reflectance module and an additional aluminum-foil reflector. With this newly developed method, the support material (cellulose nitrate, cellulose acetate and polyester) of about 99.8% of all films can be determined within two seconds of measuring time, without any further spectral processing. Very distinctive spectral patterns are obtained with this new method, regardless of which side of the film is being analyzed. A simple visual inspection of the raw spectrum is usually sufficient to determine the film support identity. A detailed comparison of the various FTIR techniques shows the advantages of the transflection measurement for the material characterization of film support layers. This newly developed method enables the non-invasive, rapid and unambiguous material identification of even large film collections in a short time.

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Li, Kuang, Shicun Jin, Yanqiang Wei, Xiaona Li, Jiongjiong Li, Sheldon Q. Shi, and Jianzhang Li. "Bioinspired hyperbranched protein adhesive based on boronic acid-functionalized cellulose nanofibril and water-soluble polyester." Composites Part B: Engineering 219 (August 2021): 108943. http://dx.doi.org/10.1016/j.compositesb.2021.108943.

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Galashina, V. N., E. V. Erokhina, N. S. Dymnikova, and A. P. Moryganov. "Modification of polyester and cellulose fiber-based materials with biologically active mono- and bimetallic nanoparticles." Russian Journal of General Chemistry 87, no. 6 (June 2017): 1403–11. http://dx.doi.org/10.1134/s1070363217060433.

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Izamshah, Raja, Zainudin Zuraidah, Mohd Shahir Kasim, M. Hadzley, and M. Amran. "Multi Objective Optimization of Cutting Parameters in Machining Cellulose Based Hybrid Composites." Applied Mechanics and Materials 761 (May 2015): 287–92. http://dx.doi.org/10.4028/www.scientific.net/amm.761.287.

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Cellulose based hybrid composites are gaining popularity in the growing green communities. With extensive studies and increasing applications for future advancement, the need for an accurate and reliable guidance in machining this type of composites has increased enormously. Smooth and defect free machined surface are always the ultimate objectives. The present work deals with the study of machining parameters (i.e. spindle speed, feed rate and depth of cut) and their effects on machining performance (i.e. surface roughness and delamination) to establish an optimized setup of machining parameters in achieving multi objective machining performance. Cellulose based hybrid composites consist of jute (a bast fiber) and glass fiber embedded in polyester resins. Response Surface Methodology (RSM) using Box-Behnken Design (BBD) was chosen as the design of experiment approach for this study. Based on that experimental approach, 17 experimental runs were conducted. Mathematical model for each response was developed based on the experimental data. Adequacy of the models were analyzed statistically using Analysis of Variance (ANOVA) in determining the significant input variables and possible interactions. The multi objective optimization was performed through numerical optimization, and the predicted results were validated. The agreement between the experimental and selected solution was found to be strong, between 95% to 96%, thus validating the solution as the optimal machining condition. The findings suggest that feed rate was the main factor affecting surface roughness and delamination .

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Jamshaid, Hafsa, Abdul Waqar Rajput, Bilal Zahid, and Sajid Hussain. "Characterisation of Interlock Knitted Fabric with Different Feed Patterns to Improve Thermal and Sensorial Comfort." Fibres and Textiles in Eastern Europe 29, no. 3(147) (June 30, 2021): 80–85. http://dx.doi.org/10.5604/01.3001.0014.7791.

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This study reports an investigation of the effect of different cellulose materials and yarn feeding patterns on thermo-physiological comfort, sensorial comfort, serviceability/pilling and ultraviolet properties. An interlock structure with a combination of hydrophilic and hydrophobic material was developed in such a way that each material was prominent in consecutive wales or courses. The yarn feed pattern in interlock fabric overcomes the limitation of plaited single jersey fabrics. Cellulose – based hydrophilic natural and regenerated fibres were used i.e cotton, model and viscose rayon, as well as hydrophobic synthetic fibre i.e. polyester for manufacturing fabric samples. By comparing the results, it became clear that wale-wise alternate yarns provide better overall moisture management properties than course-wise. Similarly, for fabric handle and pilling properties, wale-wise alternate yarn provides better properties. Interlock fabrics with the TransDRY® Technology effect are liable for use in protective textiles, medical textiles and in other functional textiles/children’s clothing.

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Kaplan, Sibel, Sebile Pulan, and Seyhan Ulusoy. "Objective and subjective performance evaluations of wet wipes including herbal components." Journal of Industrial Textiles 47, no. 8 (June 26, 2017): 1959–78. http://dx.doi.org/10.1177/1528083717716165.

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In this study, wet wipes were produced for body applications with nonwoven fabrics consisting of polyester and cellulose (viscose and Tencel®). Fabrics were wetted by natural-based wetting solutions (rose water, olive oil) which were functionalized by sodium alginate and natural antibacterial agents (cinnamaldehyde and geraniol) without preservatives. Besides physical characteristics (weight, thickness, porosity, fiber orientation), bending rigidity, Handle-O-Meter measurements, and moisture management test parameters of the nonwoven fabrics were determined. Subjective hand and wiping performances of produced wipes were determined by subjective evaluations carried out on 10 female subjects. According to the results, 100% Tencel® and its blend with viscose have good absorption and moderate transfer characteristics. Polyester content up to 60% is acceptable for wet wipes for the body according to their liquid absorption, transfer, and subjective evaluation results if fabric weight is sufficient. Among the functionalized wetting solutions, antibacterial performance of the solution including olive oil, sodium alginate and cinnamaldehyde was the maximum and it has acceptable hand values according to objective Handle-O-Meter results and subjective evaluation results.

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Cuong, Cao Xuan. "PREPARATION OF POLYMER COMPOSITES BASED ON UNSATURATED POLYESTER REINFORCED BY NATURAL FIBER AND CELLULOSE MICROFIBER FROM LUNG WASTE IN NGHE AN." Vietnam Journal of Science and Technology 54, no. 2C (March 19, 2018): 366. http://dx.doi.org/10.15625/2525-2518/54/2c/11862.

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Unsaturated polyester composites reinforced by glass fiber and by hybrid reinforcementglass fiber - lung fiber with cellulose microfiber (MFC) were prepared and investigated. Tensileand flexural strengths of material reached the highest value at polymer composite with 48 %wglass fiber mat and 0.3 %w MFC (208.33 MPa and 243.6 0 MPa), while the highest impactstrength reached 212.48 kJ/m2 at composite containing 48 %w glass fiber but 0.5 %w MFC.Especially, with 0.3 %w MFC, the tensile fatigue cycle to failure of composite processed byvacuum bag remarkably increased, 140.28 % at composite with 48 %w glass fiber and 265.63 %at hybrid composite reinforced by glass fiber/lung fiber, compared to samples without MFC.

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Taira, Shogo, Makoto Kurihara, Keiichi Koda, Kazuki Sugimura, Yoshiyuki Nishio, and Yasumitsu Uraki. "TEMPO-oxidized cellulose nanofiber-reinforced lignin based polyester films as a separator for electric double-layer capacitor." Cellulose 26, no. 1 (November 13, 2018): 569–80. http://dx.doi.org/10.1007/s10570-018-2101-z.

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Fan, Yanmiao, Faridah Namata, Johan Erlandsson, Yuning Zhang, Lars Wågberg, and Michael Malkoch. "Self-Assembled Polyester Dendrimer/Cellulose Nanofibril Hydrogels with Extraordinary Antibacterial Activity." Pharmaceutics 12, no. 12 (November 25, 2020): 1139. http://dx.doi.org/10.3390/pharmaceutics12121139.

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Cationic dendrimers are intriguing materials that can be used as antibacterial materials; however, they display significant cytotoxicity towards diverse cell lines at high generations or high doses, which limits their applications in biomedical fields. In order to decrease the cytotoxicity, a series of biocompatible hybrid hydrogels based on cationic dendrimers and carboxylated cellulose nanofibrils were easily synthesized by non-covalent self-assembly under physiological conditions without external stimuli. The cationic dendrimers from generation 2 (G2) to generation 4 (G4) based on trimethylolpronane (TMP) and 2,2-bis (methylol)propionic acid (bis-MPA) were synthesized through fluoride promoted esterification chemistry (FPE chemistry). FTIR was used to show the presence of the cationic dendrimers within the hybrid hydrogels, and the distribution of the cationic dendrimers was even verified using elemental analysis of nitrogen content. The hybrid hydrogels formed from G3 and G4 showed 100% killing efficiency towards Escherichia coli (E. coli), Staphylococcus aureus (S. aureus) and Pseudomonas aeruginosa (P. aeruginosa) with bacterial concentrations ranging from 105 CFU/mL to 107 CFU/mL. Remarkably, the hybrid hydrogels also showed good biocompatibility most probably due to the incorporation of the biocompatible CNFs that slowed down the release of the cationic dendrimers from the hybrid hydrogels, hence showing great promise as an antibacterial material for biomedical applications.

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Jasmani, Latifah, Nurul Ain Nadirah Jamaluddin, Rafeadah Rusli, Sharmiza Adnan, and Sarani Zakaria. "Different Preparation Method of Nanocellulose from Macaranga gigantea and Its Preliminary Study on Packaging Film Potential." Polymers 14, no. 21 (October 28, 2022): 4591. http://dx.doi.org/10.3390/polym14214591.

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Nanocellulose is a versatile cellulosic nanomaterial that can be used in many application areas. Applying different preparation strategies leads to different types of nanocellulose. In this study, nanocrystalline cellulose (NCC) and nanofibrillated cellulose (NFC) were prepared from lesser known wood species, viz., Macaranga gigantea, using sulfuric acid hydrolysis and enzymatic pretreatment with ultrafine grinding approaches, respectively. The respective nanocellulose was characterized by means of Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD) analysis, thermogravimetric analysis (TGA), atomic force microscopy (AFM). It was then converted into a thin film to assess its performance which includes tensile test, transparency, air permeance, water vapor transmission rate (WVTR), and water vapor permeability (WVP) properties. NCC and NFC produced from the raw material of Macaranga had average widths of 6.38 ± 3.92 nm and 13.17 ± 12.71 nm, respectively. Peaks in FTIR spectra showed the conversion of Macaranga wood to nanocellulose by the presence of cellulose fingerprint as well as absence of lignin and hemicellulose after alkaline treatment. The successful conversion was also supported by XRD analysis which displayed the increased crystallinity value from 54% to 70%. TGA decomposition pattern at 200–490 °C revealed the thermal stability of the samples. The thin film produced from nanocelluloses had WVTR values of 4.58 and 12.14 g/(day·m2) for NFC and NCC, respectively, comparable to those of films from polyester and oriented polypropylene. Nanocellulose-based thin film has the potential to be used as sustainable and biodegradable packaging.

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David, Grégoire, Nathalie Gontard, and Hélène Angellier-Coussy. "Mitigating the Impact of Cellulose Particles on the Performance of Biopolyester-Based Composites by Gas-Phase Esterification." Polymers 11, no. 2 (January 24, 2019): 200. http://dx.doi.org/10.3390/polym11020200.

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Materials that are both biodegradable and bio-sourced are becoming serious candidates for substituting traditional petro-sourced plastics that accumulate in natural systems. New biocomposites have been produced by melt extrusion, using bacterial polyester (poly(3-hydroxybutyrate-co-3-hydroxyvalerate)) as a matrix and cellulose particles as fillers. In this study, gas-phase esterified cellulose particles, with palmitoyl chloride, were used to improve filler-matrix compatibility and reduce moisture sensitivity. Structural analysis demonstrated that intrinsic properties of the polymer matrix (crystallinity, and molecular weight) were not more significantly affected by the incorporation of cellulose, either virgin or grafted. Only a little decrease in matrix thermal stability was noticed, this being limited by cellulose grafting. Gas-phase esterification of cellulose improved the filler’s dispersion state and filler/matrix interfacial adhesion, as shown by SEM cross-section observations, and limiting the degradation of tensile properties (stress and strain at break). Water vapor permeability, moisture, and liquid water uptake of biocomposites were increased compared to the neat matrix. The increase in thermodynamic parameters was limited in the case of grafted cellulose, principally ascribed to their increased hydrophobicity. However, no significant effect of grafting was noticed regarding diffusion parameters.

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Journal articles on the topic 'Cellulose-based polyesters'

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