Starch / C4~C8 ring graft copolymer and prep. and use thereof

Abstract

The present invention is starch/C4-C8 cyclic monomer grafted copolymer and its preparation process. Starch of corn, beans, potato and grains in grain size of 1-20 microns or modified starch in 1-60 portions and one or several C4-C8 cyclic monomer p-dioxy cyclohexanone, 1, 5-dioxy suberyl-2-one, gamma-butyrolactone, beta-butyrolactone, delta-valerolactone, epsilon-caprolactone, diglycolide and lactide in 40-99 portions react in a reaction bottle under the protection of inert gas and in the presence of catalyst in 0.01-5 portions at 60-150 deg.c for 10-48 hr to produce grafted copolymer. The unreacted monomer and homopolymer are extracted separately with solvent, the product is vacuum dried to constant weight, and the monomer converting rate, grafting rate and grafting efficiency are measured.

Description

1. Technical field [0001] The present invention relates to a kind of starch or modified starch and C 4 ~C 8 The invention discloses a ring-opening graft copolymer, a preparation method and application thereof, and belongs to the field of modification of polymer materials. 2. Background technology [0002] Due to the increasingly serious environmental pollution caused by discarded plastic products, more and more researchers have focused their attention on the research of fully biodegradable polymers. The research on aliphatic polymers represented by polylactic acid, polycaprolactone, and polydioxanone is the most popular. The main chain of this type of polymer is connected by easily hydrolyzed ester bonds. In nature, it can decompose and metabolize with phenols in various microorganisms or animals and plants, and finally form carbon dioxide and water. Due to the high price, such polymers are mainly used as medical materials at present. [0003] Starch is a natural polymer...

AI Technical Summary

Problems solved by technology

[0006] 3. Graft copolymerization of starch and ethylene monomers has been widely studied. For ethylene, styrene, methyl methacrylate, methyl acrylate and butyl acrylate, the grafting reaction is usually completed in a solvent. Yu Jiugao, Tian Ruchuan, Liu Xiangdong, Journal of Tianjin University, No. 3, 1993, P71~77, B.Fanta et al.Polym.Eg.Si.17(5), P311, 1977, since it was carried out in a solution, it involved solvent recovery , Dealing with problems, the process is complex and cumbersome

This type of graft copolymer is often used as a super absorbent material, but because the branched chain is still a non-degradable polymer, it still pollutes the environment

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