以2-苄基三硫代碳酸酯基乙醇为引发剂,在辛酸亚锡催化下引发丙交酯(LA)开环聚合,合成大分子链转移剂PLA macro-CTA,加入第二单体聚甲基丙烯酸N,N-二甲氨基乙酯(DMAEMA),通过可逆—加成—断裂链转移(RAFT)自由基聚合,得到两亲性嵌段共聚物PLA-b-PDMAEMA.采用核磁共振光谱(1HNMR和13 CNMR)、红外光谱(FT-IR)及凝胶色谱(GPC)对合成的共聚物化学结构进行表征,并通过接触角测试和热重分析(TGA)对其进行性能测试.结果表明成功合成了嵌段共聚物且分子量分布指数较窄；引入PDMAEMA链段后聚乳酸的热稳定性和亲水性得到提高.
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