HETEROGENEOUS THIOL-ENE CLICK MODIFICATIONS OF SOLID POLYSACCHARIDE-BASED MATERIALS

摘要

This invention concerns the first environmentally benign heterogeneous modification of polysaccharide-based material in native solid state by thiol-ene “click chemistry”. The direct reaction of a thiol with an un-activated double or triple bond by thiol-ene and thiol-enyne click modification is thermally or photochemically catalyzed and is completely metal-free and allows for a highly modular approach to modifications of fibers and fiber-based materials.

主权项

1. A method for the heterogeneous modification of solid polysaccharide-based material comprising the steps of
(ib) providing a solid polysaccharide-based material with terminal double or triple unsaturated hydrocarbon bonds; and (iib) bringing said terminal double or triple unsaturated hydrocarbon bonds to react with a molecule containing an terminal thiol group,wherein the solid polysaccharide-based material with double or triple unsaturated hydrocarbon bonds is provided by
(i) providing a solid polysaccharide-based material; (ii) providing a modifying agent comprising double or triple unsaturated hydrocarbon bonds; (iii) optionally providing a catalyst which is an acid catalyst, or a nucleophilic catalyst; and (iv) reacting the solid polysaccharide-based material with the modifying agent, optionally in the presence of said catalyst,wherein the modifying agent comprising double or triple unsaturated hydrocarbon bonds is chosen from among acids, alkyl ketene dimers, acid chlorides, epoxides, alkoxysilanes, chlorosilanes, and anhydrides containing alkene or alkyne functionality.