中文摘要：

用季戊四醇引发ε-己内酯（ε-CL）开环聚合得到四臂星形PCL，将其末端羟基转变为O-乙基黄原酸酯，以此为大分子链转移剂调控N-乙烯基己内酰胺（NVCL）的RAFT聚合，合成了以季戊四醇为核、以PCL为内臂、PNVCL为外臂的两亲性星形嵌段共聚物，用1HNMR谱证明了所得聚合物的结构。

英文摘要：

Four - arm star poly （ ε-caprolactone） （PCL） was first synthesized by the ring - opening polymerization （ROP） of s -caprolactone （ε-CL） using pentaerythritol as initiator. The resulting hydroxyl end group was converted to a macro - chain transfer end group （ 0 - ethyl xanthate）, yielded PCL - CTA used as macro - chain transfer agent for the xanthatemediated RAFT polymerization of NVCL. Finally, well - defined amphiphilic four - arm star diblock copolymers with pentaerythritol as core, PCL and PNVCL structure was characterized by 1H NMR spectra. as fist and second arm were successfully synthesized. Its