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A one pot one step combined radical and ring-opening route for the dual functionalization of starch in aqueous medium
Abstract : Starch based materials are attractive bio-based alternative to fully synthetic polymers. Native starch has however limited thermoprocessability and properties and must be modified. In order to improve the properties of starch-graft-poly(butyl-acrylate-co-styrene) copolymers via a process as green as possible, we report herein a new method for the dual functionalization of the polysaccharide via a one pot one step reaction in aqueous medium combining free radical polymerizations and ring-opening chemistry. Poly(butyl acrylate) / poly(butyl acrylate-co-styrene) (ca. 60 000 g/mol) and oligo(-caprolactone) were grafted on starch with a grafting percentage up to 75 %. The copolymers show two glass transition temperatures: one around 55-60°C related to starch and a second attributed to the grafted vinyl polymers, from -46°C to 20°C depending on butyl acrylate/styrene ratio). The resulting dual functionalized materials exhibit excellent mechanical properties, with elongation at break in the range 20-210 %, while single functionalized starch shows less than 5 %.
https://hal.univ-lille.fr/hal-03010026
Contributeur : Lilloa Université de Lille <>
Soumis le : mardi 17 novembre 2020 - 15:19:50
Dernière modification le : jeudi 26 novembre 2020 - 03:24:12
Contributeur : Lilloa Université de Lille <>
Soumis le : mardi 17 novembre 2020 - 15:19:50
Dernière modification le : jeudi 26 novembre 2020 - 03:24:12