Copolyesters of isosorbide, succinic acid, and isophthalic acid: Biodegradable, high T-g engineering plastics

International audienceIsosorbide, succinyl chloride and isophthaloyl chloride are polycondensed under various reaction conditions. The heating in bulk with or without catalysts as well in an aromatic solvent without catalyst, and polycondensation with the addition of pyridine only yield low molar mass copolyesters. However, heating in chlorobenzene with addition of SnCl2 or ZnCl2 produces satisfactory molar masses. The number average molecular weights (Mn) of most copolyesters fall into the range of 700015,000 Da with polydispersities (PD) in the range of 39. The MALDI-TOF mass spectra almost exclusively displayed peaks of cyclics indicating that the chain growth was mainly limited by cyclization and not by side reactions, stoichiometric imbalance or incomplete conversion. The glass-transition temperatures increased with the content of isophthalic acid from 75 to 180 degrees C and the thermo-stabilities also followed this trend

Synthesis of new biosourced monomers form 1,4:3,6 dianhydrohexitols

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New biosourced AA and AB monomers from 1,4:3,6 dianhydrohexitols

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Copolyethersulfones of 1,4:3,6-dianhydrohexitols and bisphenol A

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Synthèse de polymères issus de l'amidon de maïs : étude des structures par combinaison des techniques MALDI-ToF et RMN

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New bio-based vinyl monomers from dianhydrohexitol isomers and/or furan

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Synthesis of new poly(ether ketone)s derived from biobased diols

International audienceThumbnail image of graphical abstract A new class of poly(ether ketone)s (PEKs) is prepared by polycondensation of various diols produced from biomass and various difluoro aromatics. After optimization of the reaction conditions, polycondensation of isosorbide and 4,4′-difluorodiphenylketone (2a) gives PEK1 with a high yield, moderate viscosity (0.31 dL g−1), and a glass-transition temperature (Tg) of 170 °C. The optimum conditions are applied to the synthesis of a series of PEKs (PEK 2-9) from difluoro agents and sugar diols. The polycondensation of isomannide (1b) with 1,4-di(p-fluorobenzoyl)benzene (2b) gives the best results with an inherent viscosity of 0.52 dL g−1 and the mass spectrum shows an abundance of cyclic structures. Similar conditions are used for the preparation of high-molar-mass copoly(ether ketone)s from a stoechiometric mixture of isosorbide/bisphenol-A