首先采用壳聚糖(CS)与2-氯乙醇反应制备了羟乙基壳聚糖(HECS),然后通过本体开环聚合法,以辛酸亚锡为催化剂,CS和HECS为大分子引发剂引发消旋-丙交酯开环聚合制备了一系列CS-g-PDLLA和HECS-g-PDLLA共聚物,用FTIR、1H NMR、XRD、TG和溶解实验对产物的结构与性能进行了分析表征.结果表明,与CS相比,HECS明显具有较高的反应活性,当n(D,L-LA):n(aminoglucoside) 投料比从10:1增大到40:1,对应CS-g-PDLLA和HECS-g-PDLLA共聚物的接枝率分别从24.01%和77.42%上升到114.85%和380.51%,而两者中的聚乳酸侧链上的平均乳酰单元数也相应从0.61和2.51分别上升到2.48和12.31.另外,原料投料比对共聚物的组成与性能有显著影响,随n(D,L-LA):n(aminoglucoside)值增大,共聚物的接枝率和聚乳酸侧链上的平均乳酰单元数也逐渐增大,共聚物的结晶性能下降,起始热分解温度有所降低.与CS-g-PDLLA相比,HECS-g-PDLLA在常用有机溶剂中的溶解性能有所改善.
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