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Photochemical [2+2] cycloaddition of biobased latexes for composites with microfibrillated cellulose

Abstract : A biobased latex was obtained by copolymerization in emulsion of ethoxy dihydroeugenyl methacrylate (EDMA) and coumarin methacrylate (CMA). Thin films of poly(EDMA-co-CMA) were irradiated with UV light at 365 nm, to promote the [2+2] photocycloaddition reaction of the coumarin moieties. The advancement of the reaction was followed by monitoring the intensity of the UV-Vis absorbance at 320 nm, characteristic of coumarin, after different irradiation times. Complete dimerization of the coumarin moieties could be achieved. A microfibrillated cellulose (MFC) reinforcement was added to the poly(EDMA-co-CMA) latexes to prepare composite materials. The permeability of the composite films to oxygen, before and after crosslinking, was assessed. For the non-crosslinked films, increasing the cellulose content from 5 wt% to 30 wt% decreased the oxygen transmission rate (OTR) by approximately 70%. When 1 wt% CMA moieties were present in the polymer backbone the OTR was approximately 50 % lower with respect to poly(EDMA) composites. A further slight decrease of permeability was observed upon crosslinking of the composite poly(EDMA-co-CMA)/MFC films.
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https://hal.archives-ouvertes.fr/hal-03735509
Contributor : Sylvain Caillol Connect in order to contact the contributor
Submitted on : Thursday, July 21, 2022 - 2:20:06 PM
Last modification on : Tuesday, September 27, 2022 - 4:09:33 AM

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Sara Dalle Vacche, Samantha Molina-Gutiérrez, Vincent Ladmiral, Sylvain Caillol, Roberta Bongiovanni, et al.. Photochemical [2+2] cycloaddition of biobased latexes for composites with microfibrillated cellulose. Chemical Engineering Transactions, AIDIC, 2022, 92, pp.277-282. ⟨10.3303/CET2292047⟩. ⟨hal-03735509⟩

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