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Letteratura scientifica selezionata sul tema "Bio-Sourced and biodegradable polyesters"

Autore: Grafiati

Pubblicato: 16 novembre 2024

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Articoli di riviste sul tema "Bio-Sourced and biodegradable polyesters"

Contreras Ramírez, Jesús Miguel, Dimas Alejandro Medina e Meribary Monsalve. "Poliésteres como Biomateriales. Una Revisión". Revista Bases de la Ciencia. e-ISSN 2588-0764 6, n. 2 (30 agosto 2021): 113. http://dx.doi.org/10.33936/rev_bas_de_la_ciencia.v6i2.3156.

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Los materiales biodegradables se utilizan en envases, agricultura, medicina y otras áreas. Para proporcionar resultados eficientes, cada una de estas aplicaciones demanda materiales con propiedades físicas, químicas, biológicas, biomecánicas y de degradación específicas. Dado que, durante el proceso de síntesis de los poliésteres todas estas propiedades pueden ser ajustadas, estos polímeros representan excelentes candidatos como materiales sintéticos biodegradables y bioabsorbibles para todas estas aplicaciones. La siguiente revisión presenta una visión general de los diferentes poliésteres biodegradables que se están utilizando actualmente y sus propiedades, así como nuevos desarrollos en su síntesis y aplicaciones. Palabra clave: biomateriales, polímeros biodegradables, poliésteres, policarbonatos, biopolímeros. Abstract Biodegradable materials are used in packaging, agriculture, medicine, and many other areas. These applications demand materials with specific physical, chemical, biological, biomechanical, and degradation properties to provide efficient results. Since all these properties can be adjusted during the polyesters synthesis process, these polymers represent excellent candidates as biodegradable and bio-absorbable synthetic materials for all these applications. Here, in this review is presented an overview of the different biodegradable polyesters currently used, their properties, and new developments in their synthesis and applications. Keywords: biomaterials, biodegradable polymers, polyesters, polycarbonates, biopolymers.

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Lang, Kening, Regina J. Sánchez-Leija, Richard A. Gross e Robert J. Linhardt. "Review on the Impact of Polyols on the Properties of Bio-Based Polyesters". Polymers 12, n. 12 (12 dicembre 2020): 2969. http://dx.doi.org/10.3390/polym12122969.

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Bio-based polyol polyesters are biodegradable elastomers having potential utility in soft tissue engineering. This class of polymers can serve a wide range of biomedical applications. Materials based on these polymers are inherently susceptible to degradation during the period of implantation. Factors that influence the physicochemical properties of polyol polyesters might be useful in achieving a balance between durability and biodegradability. The characterization of these polyol polyesters, together with recent comparative studies involving creative synthesis, mechanical testing, and degradation, have revealed many of their molecular-level differences. The impact of the polyol component on the properties of these bio-based polyesters and the optimal reaction conditions for their synthesis are only now beginning to be resolved. This review describes our current understanding of polyol polyester structural properties as well as a discussion of the more commonly used polyol monomers.

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Kopitzky, Rodion. "Poly(lactic acid)–Poly(butylene succinate)–Sugar Beet Pulp Composites; Part II: Water Absorption Characteristics with Fine and Coarse Sugar Beet Pulp Particles; A Phenomenological Investigation". Polymers 13, n. 20 (15 ottobre 2021): 3558. http://dx.doi.org/10.3390/polym13203558.

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Sugar beet pulp (SBP) is a residue available in large quantities from the sugar industry, and can serve as a cost-effective bio-based and biodegradable filler for fully bio-based compounds containing bio-based polyesters. The composition of SBP is characterized by an unusually high content of pectins, which are known as water-binding substances. Their molecular structure and the poor gelling properties, compared to other pectin sources, do not allow industrial use on a larger scale. However, good water absorption capacity can be advantageous for promoting plastics degradation or disintegration in the environment. In this study, we evaluated the water absorption capacity and processes of SBP-filled composites with bio-based polyesters on a longer time scale. We analyzed water absorption from a phenomenological point of view and tried to derive basic parameters for the general description of the composites behavior. We found that polar polyesters or polyester blends filled with higher amounts of especially coarse SBP suffer disintegration within a few weeks when supplied with sufficient water. On the other hand, less polar polyesters filled with fine SBP rather absorb water but do not show disintegration for several months. On a time scale of a few years, catalytic disintegration of the composites appears to be independent of the addition of SBP.

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Berketova, L., e V. Polkovnikova. "On the Eco-, Edible and Fast-decomposing Packaging in the Food Industry". Bulletin of Science and Practice 6, n. 10 (15 ottobre 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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González-Arancibia, Fernanda, Maribel Mamani, Cristian Valdés, Caterina Contreras-Matté, Eric Pérez, Javier Aguilera, Victoria Rojas, Howard Ramirez-Malule e Rodrigo Andler. "Biopolymers as Sustainable and Active Packaging Materials: Fundamentals and Mechanisms of Antifungal Activities". Biomolecules 14, n. 10 (27 settembre 2024): 1224. http://dx.doi.org/10.3390/biom14101224.

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Developing bio-based and biodegradable materials has become important to meet current market demands, government regulations, and environmental concerns. The packaging industry, particularly for food and beverages, is known to be the world’s largest consumer of plastics. Therefore, the demand for sustainable alternatives in this area is needed to meet the industry’s requirements. This review presents the most commonly used bio-based and biodegradable packaging materials, bio-polyesters, and polysaccharide-based polymers. At the same time, a major problem in food packaging is presented: fungal growth and, consequently, food spoilage. Different types of antifungal compounds, both natural and synthetic, are explained in terms of structure and mechanism of action. The main uses of these antifungal compounds and their degree of effectiveness are detailed. State-of-the-art studies have shown a clear trend of increasing studies on incorporating antifungals in biodegradable materials since 2000. The bibliometric networks showed studies on active packaging, biodegradable polymers, films, antimicrobial and antifungal activities, essential oils, starch and polysaccharides, nanocomposites, and nanoparticles. The combination of the development of bio-based and biodegradable materials with the ability to control fungal growth promotes both sustainability and the innovative enhancement of the packaging sector.

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Kuru, Zehra, e Mehmet Arif Kaya. "Poly(Lactic Acid) / Polyester Blends: Review of Current and Future Applications". European Journal of Research and Development 3, n. 1 (28 marzo 2023): 175–99. http://dx.doi.org/10.56038/ejrnd.v3i1.259.

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Poly (lactic acid) (PLA) is a promising polymer with its value and potential due to its sustainability, low carbon footprint, and being a superior bio-based polymer compared to other bioplastics. Since it is also a compostable aliphatic polyester, has been frequently subjected to research. Researchers have conducted studies on the compatibility of PLA, which is a bio-based, biodegradable, and compostable, renewable polymer, with traditional petrochemical-based polymers, especially polyesters such as polybutylene terephthalate (PBT), and polyethylene terephthalate (PET). It is highly important that applications of PLA/polyester blends will ensure that the materials developed are not only economically and sustainable but also can meet current and future appropriate needs. PLA-based materials have some disadvantages such as slow biodegradation rate, high cost, and low toughness, and to eliminate mentioned drawbacks generally blends are prepared with petroleum-based polymers. In this review, information about the perspectives with studies for PLA/polyester blends; approaches to the subject, potential application areas, and contributions for the future were given.

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Todea, Anamaria, Emese Biro, Valentin Badea, Cristina Paul, Adinela Cimporescu, Lajos Nagy, Sándor Kéki, Geza Bandur, Carmen Boeriu e Francisc Péter. "Optimization of enzymatic ring-opening copolymerizations involving δ-gluconolactone as monomer by experimental design". Pure and Applied Chemistry 86, n. 11 (1 novembre 2014): 1781–92. http://dx.doi.org/10.1515/pac-2014-0717.

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Abstract Enzymatic incorporation of carbohydrate-derived monomer units into hydrophobic polyester backbones represents a promising alternative to obtain new biodegradable oligomers and polymers. Immobilized lipases are efficient biocatalysts for copolymerization of β-butyrolactone and δ-gluconolactone, but only a systematic optimization study was able to highlight the influence of the main reaction parameters on the polymerization degree and on the relative copolymer content of the product. Therefore, experimental design was employed for determination of the optimal ring-opening copolymerization conditions in solventless reaction systems, at temperatures up to 80 °C. The obtained products, cyclic and linear polyesters, have been characterized by FT-IR, MALDI-TOF MS, NMR, and TG analysis, demonstrating the incorporation of gluconolactone unit(s) into the hydrophobic backbone of the polyester and the formation of new bio-based products.

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Montava-Jorda, Sergi, Diego Lascano, Luis Quiles-Carrillo, Nestor Montanes, Teodomiro Boronat, Antonio Vicente Martinez-Sanz, Santiago Ferrandiz-Bou e Sergio Torres-Giner. "Mechanical Recycling of Partially Bio-Based and Recycled Polyethylene Terephthalate Blends by Reactive Extrusion with Poly(styrene-co-glycidyl methacrylate)". Polymers 12, n. 1 (9 gennaio 2020): 174. http://dx.doi.org/10.3390/polym12010174.

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In the present study, partially bio-based polyethylene terephthalate (bio-PET) was melt-mixed at 15–45 wt% with recycled polyethylene terephthalate (r-PET) obtained from remnants of the injection blowing process of contaminant-free food-use bottles. The resultant compounded materials were thereafter shaped into pieces by injection molding for characterization. Poly(styrene-co-glycidyl methacrylate) (PS-co-GMA) was added at 1–5 parts per hundred resin (phr) of polyester blend during the extrusion process to counteract the ductility and toughness reduction that occurred in the bio-PET pieces after the incorporation of r-PET. This random copolymer effectively acted as a chain extender in the polyester blend, resulting in injection-molded pieces with slightly higher mechanical resistance properties and nearly the same ductility and toughness than those of neat bio-PET. In particular, for the polyester blend containing 45 wt% of r-PET, elongation at break (εb) increased from 10.8% to 378.8% after the addition of 5 phr of PS-co-GMA, while impact strength also improved from 1.84 kJ·m−2 to 2.52 kJ·m−2. The mechanical enhancement attained was related to the formation of branched and larger macromolecules by a mechanism of chain extension based on the reaction of the multiple glycidyl methacrylate (GMA) groups present in PS-co-GMA with the hydroxyl (–OH) and carboxyl (–COOH) terminal groups of both bio-PET and r-PET. Furthermore, all the polyester blend pieces showed thermal and dimensional stabilities similar to those of neat bio-PET, remaining stable up to more than 400 °C. Therefore, the use low contents of the tested multi-functional copolymer can successfully restore the properties of bio-based but non-biodegradable polyesters during melt reprocessing with their recycled petrochemical counterparts and an effective mechanical recycling is achieved.

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Lucas, Francisco W. S., Yuval Fishler e Adam Holewinski. "Tuning the selectivity of electrochemical levulinic acid reduction to 4-hydroxyvaleric acid: a monomer for biocompatible and biodegradable plastics". Green Chemistry 23, n. 22 (2021): 9154–64. http://dx.doi.org/10.1039/d1gc02826j.

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Levulinic acid (LA) is a biomass-derived feedstock; herein, we present an efficient electrochemical method for converting LA into 4-hydroxyvaleric acid, a valuable monomer for bio-polyesters, as well as γ-valerolactone (a green fuel/solvent).

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Dong, Weifu, Huiling Li, Mingqing Chen, Zhongbin Ni, Jishi Zhao, Haipeng Yang e Pieter Gijsman. "Biodegradable bio-based polyesters with controllable photo-crosslinkability, thermal and hydrolytic stability". Journal of Polymer Research 18, n. 6 (11 novembre 2010): 1239–47. http://dx.doi.org/10.1007/s10965-010-9526-x.

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Più fonti

Tesi sul tema "Bio-Sourced and biodegradable polyesters"

Hallavant, Kylian. "Etude de la mobilité moléculaire de polyesters biosourcés à structures chimiques contrôlées". Electronic Thesis or Diss., Normandie, 2024. http://www.theses.fr/2024NORMR041.

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La diminution des ressources fossiles et la prise de conscience collective de l’impact des déchets plastiques sur l’environnement nécessitent la recherche d’alternatives possibles aux polymères issus du pétrole, avec une empreinte carbone et des risques environnementaux réduits. C’est pourquoi les polyesters biosourcés et/ou biodégradables ont attiré l’attention des chercheurs universitaires et des industriels. Cette thèse se concentre sur la caractérisation thermique des copolyesters à base d'acides gras hydroxylés, qui sont extraits des déchets agricoles de tomate, et de poly (alkylene trans-1,4-cyclohexanedicarboxylate) (PCHs), qui sont des matériaux biodégradables et potentiellement biosourcés avec d'intéressantes propriétés barrières. Cette thèse montre que les deux systèmes ont des vitesses de cristallisation élevées et forment des microstructures complexes impliquant plusieurs polymorphes avec une forte densité de petites sphérulites. La microstructure dépend des conditions de traitement (vitesse de refroidissement depuis le fondu, température de cristallisation) et de la nature chimique du matériau (densité de réticulation pour les acides gras hydroxylés et longueur de la chaîne alkyle dans la chaîne principale de l'unité répétitive pour les PCHs). La réticulation réduit la mobilité des chaînes macromoléculaires et inhibe la cristallisation, tandis que la longueur de la chaîne alkyle induit un effet pair-impair avec des conséquences sur les températures de fusion et de cristallisation, sur le couplage entre les phases amorphe et cristalline, sur l'indice de fragilité et sur l'aptitude à former un verre
The decline of fossil resources and the raise of collective awareness about the impact of plastic waste on the environment impose to look for possible alternatives to petroleum-based polymers with reduced carbon footprint and environmental risks. For this reason, bio-sourced and/or biodegradable polyesters have attracted much attention from both academic researchers and industrials. This thesis focuses on the thermal characterization of co-polyesters based on hydroxy-fatty acids, which are extracted from tomato-peel agro-wastes, and poly (alkylene trans-1,4-cyclohexanedicarboxylate) (PCHs), which are biodegradable and potentially biobased materials with interesting barrier properties. This thesis shows that both systems have high crystallization rates and form complex microstructures involving several polymorphs with a high density of small spherulites. The microstructure depends on the processing conditions (cooling rate from the melt, crystallization temperature) and on the chemical nature of the material (crosslinking density for the hydroxy-fatty acids, and alkyl chain length within the main structure of the repeating unit for the PCHs). Crosslinking reduces the mobility of the macromolecular chains and inhibits crystallization, whereas the alkyl chain length induces an odd-even effect with consequences on the melting and crystallization temperatures, on the coupling between the amorphous and crystalline phases, on the fragility index and on the glass-forming ability

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SIOTTO, MICHELA BARBARA. "Study of the biodegradation in soil of new generation plactics". Doctoral thesis, Università degli Studi di Milano-Bicocca, 2011. http://hdl.handle.net/10281/19950.

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The intense use of plastic contributes to increase the amount of municipal waste that are generally disposed in landfill. For some applications and sectors, an important alternative to the conventional plastic materials can be found in the use of the new generation materials: the biodegradable polymers. Their use can be an alternative to landfill disposal and can thus reduce the cost of waste management and the accumulation in the environment. The biodegradable polymers, in fact, are used by microorganisms as source of carbon and are converted by into carbon dioxide (or methane), water and mineral salts of any other element present (mineralization) plus new biomass. Generally, laboratory test methods developed for determining the biodegradability of polymeric material are based on the evaluation of the carbon dioxide production (respirometric test), but in order to completely describe the biodegradation process and to avoid an underestimation of the biodegradation percentage, it is very important to quantify and identify possible by-products and biomass production. The experimental work presents in this thesis concerned the study of the different aspects of the biodegradation of new generation plastics in soil. Particular attention was focused on the fate of the possible by-products of biodegradable polymers (the monomers) and on the determination of the biomass generated during the process. To summarize: 1) The effects of the soil pH on the mineralization of ten monomers, chosen between the most widely used for the synthesis of plastic materials, was evaluated by respirometric tests and the experimental data were used to validate a numerical model that can estimate the amount of carbon used by microorganism for biochemical synthesis. 2) The mineralization of a model polyester was investigated by respirometric tests in different soil mixtures in order to evaluate the effects of the initial soil pH and of the addition of organic matter. 3) The combustion of soil samples at 550 °C was used for determining the amount of organic matter and biomass in soil samples. The sensitivity of the method was evaluated by adding different low amounts of organic matter to a natural and a synthetic soil. 4) In order to describe the carbon balance during the biodegradation of the model polyester, biomass production and polyester residues in soil were estimated. Biomass and organic matter deriving by polyester biodegradation were studied by combustion of soil samples. Polyester residues were estimated by extractions in soxhlet of soil samples (with chloroform) and the extracts were characterized by 1H-NMR and 31P-NMR acquisitions and GPC.

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Libri sul tema "Bio-Sourced and biodegradable polyesters"

PRODUCTION OF BIODEGRADABLE PLASTICS AND BIOPLASTICS TECHNOLOGY (POLYLACTIC ACID, BIO-BASED POLYETHYLENE, POLYVINYL CHLORIDE, ALIPHATIC POLYESTERS, COPOLYESTER, POLYBUTYLENE TEREPHTHALATE, POLYETHYLENE ISOSORBIDE THEREPHTHALATE). Delhi, India: Engineers India Research Institute, 2016.

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Capitoli di libri sul tema "Bio-Sourced and biodegradable polyesters"

Agarwal, Seema. "Functional (Bio)degradable Polyesters by Radical Ring-Opening Polymerization". In Biodegradable Polyesters, 25–45. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2015. http://dx.doi.org/10.1002/9783527656950.ch2.

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Wang, James H., e Aimin He. "Bio-Based and Biodegradable Aliphatic Polyesters Modified by a Continuous Alcoholysis Reaction". In ACS Symposium Series, 425–37. Washington, DC: American Chemical Society, 2010. http://dx.doi.org/10.1021/bk-2010-1043.ch029.

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Rydz, Joanna. "New Research Strategy in Forecasting Directions of (Bio)degradable Polyester Applications". In Biodegradable Polymers, 141–66. Boca Raton: CRC Press, 2023. http://dx.doi.org/10.1201/9780429352799-7.

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Avérous, Luc. "Biocomposites Based on Biodegradable Thermoplastic Polyester and Lignocellulose Fibers". In Cellulose Fibers: Bio- and Nano-Polymer Composites, 453–78. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-17370-7_17.

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Yılmaz, Betül Bay. "Perspectives of Biodegradable Nanocoatings in Food Packaging". In Sustainable Approach to Protective Nanocoatings, 113–69. IGI Global, 2024. http://dx.doi.org/10.4018/979-8-3693-3136-1.ch005.

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Nanotechnology has the potential to improve human health, economic prosperity, product innovation, and overall quality of life, including through food nanopackaging––a promising area focusing on biodegradable packaging solutions. This alternative to conventional packaging minimizes waste, extends food shelf life, and enhances overall quality. The production of biodegradable nanocoatings can contribute to industry sustainability by reducing water consumption, solid waste, electricity use, and emissions. Bio-based coatings, with compatibility and matrix properties, can incorporate antioxidant agents and antimicrobial compounds, enhancing product safety, functionality, and shelf life. Biodegradable polymers, including polysaccharides, proteins, lipids, and polyesters, offer innovative pathways for entirely bio-based nanocoatings. These cost-effective, biocompatible, and renewable materials can be sourced directly from marine organisms and plants or produced through fermentative processes by microorganisms, such as microbial polyesters or polysaccharides. However, challenges in handling biopolymers, such as their hydrophilicity, crystallization tendencies, brittleness or melting instabilities, necessitate blending them with other materials to enhance their coating performance. Integrating nanoparticles within biopolymers can address environmental concerns by reducing packaging materials and enhancing recyclability. This approach aligns with a more eco-sustainable approach to food packaging, resulting in reduced waste.

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Grewell, D., J. Schrader e G. Srinivasan. "Protein-based Plastics". In Bioplastics and Biocomposites, 213–23. Royal Society of Chemistry, 2023. http://dx.doi.org/10.1039/bk9781788010085-00213.

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Protein-based plastics were developed and tested in the early 20th century by industrialists such as Henry Ford and George Washington Carver but never reached commercialization because of the advent of petrochemical feedstocks. Today, the demand for bio-renewable and biodegradable materials has led to the development and characterization of novel materials, many of which are now on the market, including polyesters (polylactic acid and polyglycolic acid) and starch-based plastics that have not reached product maturity. Other bioplastics, such as polyethylene derived from starch-based biomass or sugars, are not biodegradable but offer properties comparable to those of commercial petrochemical plastics. The polyethylene terephthalate (PET) bottles produced by Coca-Cola contain 30% bio-based materials and are predicted to be 100% bio-based in the future. Protein-based plastics offer characteristics that make them strong candidates as ecofriendly solutions for specific applications, and they are especially attractive for situations where the proteins can provide added functions when compared to other polymers.

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Puiggalí, Jordi, Angélica Díaz e Ramaz Katsarava. "Bio-based aliphatic polyesters from dicarboxylic acids and related sugar and amino acid derivatives". In Biodegradable and Biocompatible Polymer Composites, 317–49. Elsevier, 2018. http://dx.doi.org/10.1016/b978-0-08-100970-3.00011-0.

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Mizan, Md Mizanul Haque, Farah Rahman Omi, Hamadia Sultana e Mohtada Sadrzadeh. "Bio-sourced and biodegradable materials for membrane fabrication". In Green Membrane Technologies towards Environmental Sustainability, 169–208. Elsevier, 2023. http://dx.doi.org/10.1016/b978-0-323-95165-4.00007-0.

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S, Pradeepa, Anitha J e Ramya N. "ECO MATERIALS". In Futuristic Trends in Construction Materials & Civil Engineering Volume 3 Book 5, 161–70. Iterative International Publishers, Selfypage Developers Pvt Ltd, 2024. http://dx.doi.org/10.58532/v3bjce5p2ch6.

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The increasing global awareness of environmental issues has led to a growing demand for sustainable practices in various industries. One crucial aspect is the development and utilization of eco-friendly materials, which are designed to minimize the environmental impact of production, consumption, and disposal. This abstract provides an overview of the concept of eco-materials, highlighting their significance, characteristics, and potential applications. Eco-materials, also known as environmentally friendly materials or green materials, are those that are sourced, processed, and used in a way that has minimal negative effects on the environment. These materials aim to reduce resource depletion, energy consumption, and waste generation throughout their life cycle. Key characteristics of eco-materials include recyclability, biodegradability, low carbon footprint, and the use of renewable resources. The development of eco-materials involves a multidisciplinary approach, combining principles from materials science, chemistry, engineering, and environmental science. Researchers and industries are actively exploring innovative ways to replace conventional materials with eco-friendly alternatives in various applications such as construction, packaging, textiles, and electronics. Several types of eco-materials have emerged, including bio-based polymers, recycled materials, sustainable composites, and materials designed for disassembly. Bio-based polymers, derived from renewable resources like plants and bacteria, offer a biodegradable alternative to traditional petroleum-based plastics. Recycled materials, such as recycled metals, paper, and glass, contribute to reducing the demand for virgin resources. Sustainable composites combine materials like natural fibers with recycled polymers to create durable and environmentally friendly alternatives. In conclusion, the development and utilization of eco-materials represent a crucial step towards achieving a more sustainable and environmentally conscious future. As research continues to advance in this field, the integration of eco-friendly materials into mainstream industries will contribute to a more circular and regenerative economy, fostering a harmonious relationship between human activities and the natural environment.

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Atti di convegni sul tema "Bio-Sourced and biodegradable polyesters"

Brosnan, Bridget L., Jill M. Tebbe e Luis A. Villahermosa. "Evaluation of Storage Effects on Commercial, Biodegradable, Synthetic or Bio-sourced Hydraulic Fluid". In SAE World Congress & Exhibition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2007. http://dx.doi.org/10.4271/2007-01-1451.

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CLOËZ, Liam. "Machinability of PLA obtained by injection molding under a dry milling process". In Material Forming. Materials Research Forum LLC, 2024. http://dx.doi.org/10.21741/9781644903131-208.

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Abstract. This paper is part of a study focusing on the elaboration of accurate component with complex geometries using bio-sourced as an alternative to petrochemical polymer. The bio-sourced and biodegradable in this study is composed of a Poly Lactic Acid (PLA) matrix and hemp fibers. The final component is obtained by injection followed by a machining operation. the final component is obtained by injection followed by a machining finishing operation. Injection molding will be carried out to be compared with 3D printing on economic, environmental, production and workpiece quality criteria. This paper focuses only on the combination of two processes, injection molding followed by machining on poly (L-lactic acid) or PLLA which is biobased and biodegradable. After injecting the workpiece, thermo-physical characterization tests are realized on PLLA polymer. Rheology, thermal and mechanical tests are carried out in order to study thermomechanical behavior and to understand material flow phenomena at different temperatures and shear rates. The objective of this paper is to overcome the technical challenges of milling this material without any lubricant. In an upcoming project, various machining operations will be carried out such as turning to study continuous cutting, or milling to study discontinuous cutting on workpieces reinforced with bio-sourced fibers as hemp.

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Refaa, Zakariaa, Mhamed Boutaous, Shihe Xin e Patrick Bourgin. "Towards the Enhancement of the Crystallization Kinetics of a Bio-Sourced and Biodegradable Polymer PLA (Poly (Lactic Acid))". In ASME 2014 4th Joint US-European Fluids Engineering Division Summer Meeting collocated with the ASME 2014 12th International Conference on Nanochannels, Microchannels, and Minichannels. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/fedsm2014-21952.

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Abstract (sommario):

PLA (Poly Lactic Acid) is a bio-sourced and a biodegradable polymer. It represents an interesting substitute for some petrochemical based polymers, especially because of its wide range of applications in the biomedical, agriculture and packaging fields. Unfortunately, PLA exhibits slow crystallization kinetics, limiting the amount of crystallinity in the final product, which is a handicap in order to extend its use. Many authors have investigated the crystallization of polymers; nevertheless several physical mechanisms remain not yet understood. This work aims a complete characterization of PLA in order to improve the understanding of its crystallization kinetics. The quiescent crystallization was investigated using Differential Scanning Calorimetry (DSC) measurements in isothermal and non-isothermal conditions for PLA and PLA with 5wt % talc. The flow effect on crystallization was studied using a thermocontrolled hot-stage shearing device (Linkam) coupled with an optical microscope. The number of activated nuclei and the growth rate were measured as functions of temperature. In addition, the linear viscoelastic properties were obtained from a rheometer with plate-plate geometry. The enhancement of the crystallization was quantified and analyzed in terms of the half crystallization time t1/2. This characteristic time t1/2 is found to be drastically decreased by both the talc and the flow which promote supplementary nucleation leading to various crystalline microstructures. The flow is known to orient and stretch molecules leading to an extra nucleation. An original description of this phenomenon is proposed using two characteristic Weissenberg numbers; based on the definition of Rousse and reptation times. Finally, we have proposed a semi-empirical model to quantify the thermal and flow contributions on the crystallization.

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Boutaous, Mhamed, Zakariaa Refaa, Matthieu Zinet, Shihe Xin e Patrick Bourgin. "Analysis of the Process-Structure-Behavior Interaction in Bio-Sourced Polymers: Role of the Crystallization Kinetics". In ASME 2014 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/imece2014-39729.

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Abstract (sommario):

PLA (Poly Lactic Acid) is a bio-sourced and biodegradable polymer. It represents an alternative for polymers issued from petrochemical synthesis. Unfortunately, the crystallization kinetics of PLA is very slow and limits the possibility to extend its application in several industrials domains. The enhancement of the PLA crystallization kinetic can be obtained by addition of nucleating agents of by ordering the molecular chains during flow, as in processing conditions. During processing of thermoplastic polymer experiences several thermomechanical conditions influencing drastically its final properties and mechanical behavior. During injection molding process, macromolecules are oriented and ordered due to the shear and elongation imposed by the melt flow in the mold during the filling step. As a consequence, supplementary nucleation is created in the polymer, leading to the acceleration of the crystallization kinetics. In this work, we propose to analyze and to quantify the role of the flow, the temperature kinetics and the nucleating agent on injected PLA parts structure and their mechanical behavior. A parametric analysis of the relationship between the polymer, its structure and the processing condition will be presented. The competition (sometimes antagonism) between several parameters, as the shear rate, the temperature kinetics and the nucleating agent will be highlighted.

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Ozolina, Sintija, Uldis Zaimis e Andrejs Kukuskins. "Development and application of biodegradable wheat straw and carrageenan composite in agriculture". In 23rd International Scientific Conference Engineering for Rural Development. Latvia University of Life Sciences and Technologies, Faculty of Engineering and Information Technologies, 2024. http://dx.doi.org/10.22616/erdev.2024.23.tf171.

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Environmental concerns in the long run have led the public to develop alternative materials that could be used in agriculture. The development and application of carrageenan and wheat straw biodegradable composite in agriculture is the main focus of this study. This composite is crafted to tackle the environmental repercussions linked with traditional agricultural materials. The manufacturing procedure encompasses the extraction and treatment of wheat straw fibres, which are then merged with carrageenan, a naturally occurring polysaccharide sourced from red seaweed Furcellaria Lumbricalis. The resultant bio composite displays encouraging mechanical traits, rendering it suitable for a variety of agricultural applications. The employment of wheat straw not only offers an environmentally conscious substitute but also addresses the predicament of disposing of agricultural waste. Regarding its application, the biodegradable composite can serve as a material for seedling trays. Due to the composite natural propensity to break down over time, long-term environmental pollution is prevented. Additionally, the material biodegradability is improved by its contact with soil microbes, enhancing the overall sustainability of agricultural methods. The outcomes of this study underscore the potential of the biodegradable wheat straw and carrageenan composite as a sustainable substitute for diverse agricultural applications. The development and assimilation of such environmentally friendly materials contribute to the ongoing endeavours to promote sustainable practices in agriculture, addressing both ecological apprehensions and the necessity for pioneering solutions in the field.

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Kremensas, Arūnas, Agnė Kairytė Kairytė, Saulius Vaitkus, Sigitas Vėjelis, Giedrius Balčiūnas, Anna Strąkowska e Sylwia Członka. "Mechanical performance of biodegradable hemp shivs and corn starch-based biocomposite boards". In The 13th international scientific conference “Modern Building Materials, Structures and Techniques”. Vilnius Gediminas Technical University, 2019. http://dx.doi.org/10.3846/mbmst.2019.132.

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For the production of traditional building materials, excavated natural resources are used. The production process of such materials requires high-energy demands, wherefore, high amounts of CO2 gases, which have a great impact on climate change, are emitted. Only a small part of such materials is effectively recycled and reused. Generally, they are transported to landfills, which rapidly expand and may pollute the soil, groundwater and air. Currently, a great attention is paid to the production of novel building materials. The aim is to use as less excavated materials as possible and replace them by natural renewable resources. Therefore, the recycling and utilisation at the end of life cycle of such materials would be easier and generation of waste would reduce. This way, the efforts of switching to circular economy are being put. One of the approaches – wider application of vegetable-based raw materials (cultivated and uncultivated agricultural plants). The usage of fibre hemp shives (HS) as an aggregate and corn stach (CS) as a binding material allows development of biocomposite boards (WPCs) which could contribute to the solution of the before mentioned problems. Bio-sourced materials combined with a polymer matrix offer an interesting alternative to traditional building materials. To contribute to their wider acceptance and application, an investigation into the use of wood-polymer composite boards is presented. In this study, biocomposite boards for the building industry are reported. WPCa are fabricated using a dry incorporation method of corn starch and HS treatment with water at 100 °C. The amount of CS and the size of the HS fraction are evaluated by means of compressive, bending and tensile strength, as well as microstructure. The results show that the rational amount of CS, independently on HS fraction, is 10 wt.%. The obtained WPCs have compressive stress at 10% of deformation in the range of (2.4–3.0) MPa, bending of (4.4–6.3) MPa and tensile strength of (0.23– 0.45) MPa. Additionally, the microstructural analysis shows that 10 wt.% of CS forms a sufficient amount of contact zones that strengthen the final product. The obtained average density (~319–408 kg/m3) indicate that, according to European normative document EN 316, WPCs can be classified as softboards and used as self-bearing structural material for building industry. Based on the requirements, WPCs can be applied in dry and humid conditions for the internal and external uses without loading (EN 622-4, section 4.2) or as load-bearing boards in dry and humid conditions for instantaneous or short-term load duration (EN 622-4, section 4.3).

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