Photocrosslinking of an original biobased and semi-aromatic unsaturated polyester by combined thiol-ene and cycloaddition routes

IF 4.5 3区工程技术 Q1 CHEMISTRY, APPLIED Reactive & Functional Polymers Pub Date : 2025-01-19 DOI:10.1016/j.reactfunctpolym.2025.106166

Klara Jastak, Nicolas Désilles, Fabrice Burel, Laurence Lecamp

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Abstract

This work aimed to develop an original, biobased, semi-aromatic and UV crosslinked unsaturated polyester, synthesized from a pyridine dicarboxylic acid derivative and an unsaturated aliphatic fatty acid derivative having 18 carbon atoms. A prepolymer with a number average molar mass of 1700 g/mol was synthesized and characterized by FTIR and NMR. This liquid prepolymer was then crosslinked under UV using a biobased compound, 7-mercapto-4-methyl coumarin (MMC), in two concomitant steps: the photografting of MMC onto the prepolymer by thiol-ene addition, and the photodimerization of MMC. The optimized conditions for the photochemical reaction were determined by evaluating the influence of formulation composition (thiol/fatty double bonds ratio from 0.1/1 to 1/1), temperature and irradiation time. In the end, relatively soft coatings (König hardness: 14.8 ± 0.8 s, T_g = −34 °C) were produced after 1 h under UV irradiation at 30 °C with 0.1 equivalent of MMC.

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来源期刊

Reactive & Functional Polymers 工程技术-高分子科学

CiteScore

8.90

自引率

5.90%

发文量

259

审稿时长

27 days

期刊介绍： Reactive & Functional Polymers provides a forum to disseminate original ideas, concepts and developments in the science and technology of polymers with functional groups, which impart specific chemical reactivity or physical, chemical, structural, biological, and pharmacological functionality. The scope covers organic polymers, acting for instance as reagents, catalysts, templates, ion-exchangers, selective sorbents, chelating or antimicrobial agents, drug carriers, sensors, membranes, and hydrogels. This also includes reactive cross-linkable prepolymers and high-performance thermosetting polymers, natural or degradable polymers, conducting polymers, and porous polymers. Original research articles must contain thorough molecular and material characterization data on synthesis of the above polymers in combination with their applications. Applications include but are not limited to catalysis, water or effluent treatment, separations and recovery, electronics and information storage, energy conversion, encapsulation, or adhesion.