化学学报 ›› 2011, Vol. 69 ›› Issue (04): 497-502. 上一篇    

研究简报

结构可控的聚亚甲基/聚乳酸嵌段共聚物的合成及其性能研究

李启蒸1,2,张国艺2,黄晋2,赵巧玲2,魏柳荷1,何占航*,1,马志*,2   

  1. (1郑州大学化学系 郑州 450001)
    (2中国科学院上海有机化学研究所 上海 200032)
  • 收稿日期:2010-08-15 修回日期:2010-09-20 出版日期:2011-02-28 发布日期:2010-10-25
  • 通讯作者: 马志 E-mail:mazhi728@mail.sioc.ac.cn

Synthesis and Property of Well-defined Polymethylene/Polylactide Diblock Copolymer

Li Qizheng1,2 Zhang Guoyi2 Huang Jin2 Zhao Qiaoling2 Wei Liuhe1 He Zhanhang*,1 Ma Zhi*,2   

  1. (1 Department of Chemistry, Zhengzhou University, Zhengzhou 450001)
    (2 Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai 200032)
  • Received:2010-08-15 Revised:2010-09-20 Online:2011-02-28 Published:2010-10-25

报道了一种叶立德活性聚合与开环聚合(ROP)相结合的新型合成方法, 成功地合成了结构可控的聚亚甲基/聚乳酸嵌段共聚物(PM-b-PLA). 首先通过叶立德活性聚合方法合成了含有端羟基的聚亚甲基(PM-OH, Mn=1800 g•mol-1, PDI=1.18), 再以PM-OH为大分子引发剂, 以辛酸亚锡[Sn(Oct)2]为催化剂, 引发D,L-丙交酯(LA)的开环聚合, 通过核磁共振氢谱(1H NMR), 凝胶渗透色谱(GPC)和傅里叶变换红外光谱(FT-IR)证明了PM-b-PLA嵌段共聚物的形成|利用示差扫描量热仪(DSC)测试嵌段共聚物的结晶行为, 结果显示, 聚乳酸(PLA)嵌段的引入显著影响了聚亚甲基(PM)的结晶行为|扫描电子显微镜(SEM)观察结果表明: 在低密度聚乙烯(LDPE)/PLA二元共混体系中, PM-b-PLA嵌段共聚物可作为共混相容剂改善LDPE和PLA的界面相容性|PM-b-PLA嵌段共聚物还可通过呼吸图法制备成有序多孔薄膜.

关键词: 聚烯烃, 聚乳酸, 叶立德活性聚合, 开环聚合, 嵌段共聚物

Well-defined polymethylene/poly(D,L-lactide) diblock copolymers (PM-b-PLA) were synthesized via the combination of living polymerization of ylides and ring opening polymerization of D,L-lactide. The 1H NMR spectra, GPC traces and FT-IR spectra of diblock copolymers indicated the successful extension of PLA segment. The melting behavior of PM-b-PLA diblock copolymer was investigated by differential scanning calorimetry (DSC). The results indicated that the incorporation of PLA segments effectively influence the crystalline process of PM segments. Scanning electron microscopy (SEM) observation showed that PM-b-PLA can act as an efficient compatibilizer for LDPE/PLA blends. PM-b-PLA diblock copolymers can be fabricated to ordered porous films via the breath-figure (BF) method.

Key words: polyolefin, polylactide, living polymerization of ylides, ring-opening polymerization, diblock copolymer