中文摘要：

为了克服聚β-羟基丁酸酯（PHB）的弱点,得到性能良好的新材料,本文利用原子转移自由基聚合方法,以Br-PHB-Br为大分子引发剂,苯乙烯为单体,在CuBr/N,N,N＇,N＂,N＂-五甲基-二乙基三胺（PMDETA）催化体系作用下合成了一种新的三嵌段共聚物聚苯乙烯-聚β-羟基丁酸酯-聚苯乙烯（PS-PHB-PS）.共聚物的链结构利用^1H NMR和13CNMR进行了表征,分子量特性和链段组成利用凝胶渗透色谱（SEC）方法进行了测定.聚合物的分子量随单体转化率的增加而线性增加,分子量分布指数相对较窄.这些特征都满足原子转移自由基活性聚合的理想要求.所得到的共聚物PS-PHB-PS具有较好的生物相容性,与PHB相比具有良好的耐热性.

英文摘要：

To overcome the drawback of poly（β-hydroxybutyrate） （PHB） and obtain some useful new materials based on PHB, a new ABA type triblock copolymer of PS-PHB-PS has been successfully synthesized by ATRP （atom transfer radical polymerization） method with Br-PHB-Br as macroinitiator, styrene as monomer and CuBr/PMDETA （N,N,N＇,N＂,N＂-pentamethyldiethylenetriarnine） as the catalyst system. The chain architectures of the triblock copolymers were confirmed by the IH NMR and ^13C NMR spectra. SEC （size exclusion chromatography） analysis was used to estimate the molecular weight characteristics and the lengths of the PHB and PS blocks of the copolymers. The molecular weight Mp was increased linearly with conversion and these triblock copolymers showed relatively narrow polydispersities, indicating that the system displayed characteristics of a living radical polymerization. The obtained triblock copolymers had good biocompatibility and better thermal properties than those of PHB homopolymer.