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化学学报
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化学学报 ›› 2006, Vol. 64 ›› Issue (10): 1093-1096. 上一篇    

研究简报

三嵌段共聚物PS-PHB-PS的原子转移自由基聚合

张雪勤*,1，张书彬1，郑云1，杨琥1
谢鸿峰1，王治流1，程镕时*,1,2   

  1. (1南京大学化学化工学院 介观化学教育部重点实验室 高分子科学与工程系 南京 210093)
    (2华南理工大学材料学院高分子研究所 广州 510640)
  • 投稿日期:2005-08-25 修回日期:2006-01-25 发布日期:2006-05-25
  • 通讯作者: 程镕时

Atom Transfer Radical Polymerization of PS-PHB-PS Triblock Copolymers

ZHANG Xue-Qin*,1 ZHANG Shu-Bin1, ZHENG Yun1, YANG Hu1, XIE Hong-Feng1, WANG Zhi-Liu1, CHENG Rong-Shi*,1,2   

  1. (1 Key Laboratory for Mesoscopic Chemistry, Ministry of Education; Department of Polymer Science and Engineering,
    College of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093)
    (2 College of Material Science and Engineering, Polymer Institute, South China University of Technology,
    Guangzhou 510640)
  • Received:2005-08-25 Revised:2006-01-25 Published:2006-05-25
  • Contact: CHENG Rong-Shi

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1071

被引次数

18

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13C NMR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.

关键词: 原子转移自由基聚合, 聚β-羟基丁酸酯, 三嵌段共聚物

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"-pentamethyldiethylenetriamine) as the catalyst system. The chain architectures of the triblock copolymers were confirmed by the 1H 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.

Key words: atom transfer radical polymerization, poly(β-hydroxybutyrate), triblock copolymer