Novel method for grafting chitosan onto 2-acrylamido-2-methylpropanesulfonic acid (AMPS)

Abstract

The invention relates to a novel preparation method for a chitosan graft copolymer, which belongs to the field of modification technology for natural polymers. According to the method, chitosan is used as a raw material, amino acid hydrochloride ionic liquid is used as a reaction solvent, AMPS is used as a monomer, ceric ammonium nitrate is used as an initiator, benzoquinone is used as a polymerization inhibitor, a reaction is carried out at 50 to 60 DEG C in a water bath for 2.5 to 3.5 h, and then separation and purification and vacuum drying are successively carried out so as to obtain a chitosan / AMPS graft copolymer. The graft copolymer is cross-linking-state gel, has a grafting ratio of 180%, is hard to dissolve under acidic, neutral and alkaline conditions and has certain swelling properties. The chitosan / AMPS graft copolymer prepared by using the method has the characteristics of simple process, short reaction time, a high grafting ratio, easily controllable reaction conditions, no addition of organic solvents, etc. and has wide application prospects in fields like medicine and environmental protection.

Description

technical field [0001] The invention belongs to the technical field of natural macromolecular substances, in particular to a new method for preparation of chitosan graft copolymerization by means of ionic liquid green reaction solvent. Background technique [0002] Chitosan is the N-deacetylated product of chitin. It has good biocompatibility, non-toxicity and biodegradability. It has been widely concerned in many fields such as food, medicine and water treatment. In practical applications, various monomers are often grafted onto its surface to expand the application range. However, when grafting monomers to the surface of polymers, the homopolymers produced by the homopolymerization of monomers often affect the improvement of the grafting rate, and even the grafting reaction cannot continue due to too many homopolymers. How to improve or prevent monomer homopolymerization and increase the grafting rate in chitosan grafting process is an important issue. At present, the gr...

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Problems solved by technology

[0004] At present, there are some reports about the dissolution of chitosan in ionic liquids, but there are few reports on the modification of chitosan in ionic liquids.

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