乙酰化淀粉/DL-丙交酯接枝共聚物的合成及降解性能研究  

STUDIES ON GRAFTING COPOLYMERIZATION OF ACETYLATING STARCH /DL-LACTIDE AND BIODEGRADABILITY

作　　者：由英才[1] 沈忻[1] 焦京亮[1] 李桢[1] 朱常英[1] 

机构地区：[1]南开大学化学系,南开大学吸附分离功能高分子材料国家重点实验室,天津300071

出　　处：《离子交换与吸附》2002年第1期58-63,共6页Ion Exchange and Adsorption

摘　　要：用醋酸乙烯酯和玉米淀粉反应制备出了不同取代度乙酰化淀粉,再用乙酰化淀粉同DL-丙交酯接枝共聚合成乙酰化淀粉/DL-丙交酯接枝共聚物。研究了原料配比,淀粉取代度对接枝反应单体转化率(C%),接枝率(G%)接枝效率(GE%)和接枝支链数均分子量(Mn)的影响,结果表明在给定的试验条件下接枝共聚反应的C%,G%,GE%和Mn可分别达到40%,225%,80%和1.4万。接枝共聚物在磷酸缓冲溶液和户外土壤掩埋降解实验表明, 在160天内样品失重率分别为71%和60%,表明合成的乙酰化淀粉/DL-丙交酯接枝共聚物具有很好的降解性能。The acetylating starch/DL-lactide grafting copolymer was synthesized in N,N dimethylacetamide (Me2NAC) in the presence of sodium bicarbonate. The effects of substitute degree of starch on monomer convention (C%), grafting (G%), grafting efficiency (GE%) and grafting side chain molecular weight have been studies. The C%, G% and GE% could approach 40%, 225% and 80% respectively while substitution degree of acetylating starch <0.4.The Fourier transform infrared (FTIR) spectroscopy was used to characterize the grafting side chain poly-DL-lactide. The FTIR spectrum shows an absorption band at 1750cm-1confirming the formation of ester bond, indicating the acetylating starch/DL-lactide grafting copolymer was synthesized. The degradability of grafting copolymer was tested with outdoor soil burial and in phosphorous buffer solution, the weight loss reached 60% and 71% respectively after 160 day for the copolymer, the result show the grafting copolymer has good biodegradability.

关 键 词：乙酰化淀粉 接枝共聚 磷酸缓冲溶液 DL-丙交酯 醋酸乙烯酯 合成 降解性能 接枝共聚物 生物降解材料 

分 类 号：O636.12[理学—高分子化学] X384[理学—化学]