Photocrosslinking of an original biobased and semi-aromatic unsaturated polyester by combined thiol-ene and cycloaddition routes
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 (K¨onig hardness: 14.8 ± 0.8 s, Tg = 34 ◦C) were produced after 1 h under UV irradiation at 30 ◦C with 0.1 equivalent of MMC.
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BibTeX
@article{jastak2026photocrosslinking,
title = {{Photocrosslinking of an original biobased and semi-aromatic unsaturated polyester by combined thiol-ene and cycloaddition routes}},
author = {Klara Jastak and Fabrice Burel and Laurence Lecamp and Nicolas Desilles},
journal = {Reactive and Functional Polymers},
year = {2026},
month = sep,
doi = {10.1016/j.reactfunctpolym.2025.106166},
url = {https://hal.science/hal-05612612v1},
note = {CC BY 4.0},
}
RIS
TY - JOUR
TI - Photocrosslinking of an original biobased and semi-aromatic unsaturated polyester by combined thiol-ene and cycloaddition routes
AU - Klara Jastak
AU - Fabrice Burel
AU - Laurence Lecamp
AU - Nicolas Desilles
PY - 2026
DA - 2026/09/08
JO - Reactive and Functional Polymers
DO - 10.1016/j.reactfunctpolym.2025.106166
UR - https://hal.science/hal-05612612v1
AB - 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 (K¨onig hardness: 14.8 ± 0.8 s, Tg = 34 ◦C) were produced after 1 h under UV irradiation at 30 ◦C with 0.1 equivalent of MMC.
SN - 1381-5148
SN - 1873-166X
ER -