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化学学报
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化学学报 ›› 2011, Vol. 69 ›› Issue (20): 2511-2517. 上一篇    下一篇

研究论文

Comb-coil型聚(苯乙烯-异戊二烯)共聚物在正烷烃中的自组装

鲍稔，李莉，邱枫*，杨玉良   

  1. (聚合物分子工程教育部重点实验室 复旦大学高分子科学系 上海 200433)
  • 投稿日期:2011-05-26 修回日期:2011-06-14 发布日期:2011-06-20
  • 通讯作者: 邱枫 E-mail:fengqiu@fudan.edu.cn
  • 基金资助:

    国家自然科学基金

Self-assembly Behaviors of Comb-Coil Poly(styrene-isoprene) Copolymers in Alkanes

BAO Ren, LI Li, QIU Feng, YANG Yu-Liang   

  1. (Key Laboratory of Molecular Engineering of Polymers, Ministry of Education, Department of Macromolecular Science, Fudan University, Shanghai 200433)
  • Received:2011-05-26 Revised:2011-06-14 Published:2011-06-20

PDF

898

被引次数

4

借助动态光散射(DLS)和原子力显微镜(AFM)研究了具有复杂结构的comb-coil型聚苯乙烯-异戊二烯嵌段共聚物(S-graft-I)-block-S在聚异戊二烯(PI)选择性溶剂正烷烃中的自组装行为. 结果表明comb-coil型分子在庚烷中形成球形胶束. 同时, 这些胶束的尺寸显示出独特的双分布现象. 除常见的PS-PI相分离机理外, 我们还提出一种comb-coil相分离机理. 这些双分布胶束的形成可能正是两种相分离机理共存的结果. 此外, 借助透射电镜(TEM)进一步研究了选择性、接枝度和接枝链长度对自组装行为的影响. 研究发现增加溶剂选择性或增加接枝链链长以及接枝度, 有利于两种尺寸的胶束的形成以及对应分布峰的完全分离.

关键词: comb-coil型共聚物, 自组装, 双分布, 选择性, 接枝度, 接枝链长度

The self-assembly of the comb-coil poly(styrene-isoprene) block copolymers (S-graft-I)-block-S in polyisoprene (PI) selective solvents was investigated using dynamic light scattering (DLS) and atomic force microscopy (AFM). The copolymers of this architecture can only micellize into spherical morphology in heptanes. And these spherical micelles exhibit an unexpected bimodal size distribution. Besides the traditional polystyrene(PS)-PI phase separation mechanism, a comb-coil phase separation mechanism is proposed. And the formation of these bimodal micelles is suggested originating from the coexistence of these two mechanisms. Furthermore, the effects of selectivity, branch number and branch length on the self-assembly behaviors were studied using DLS and transmission electron microscope (TEM).

Key words: comb-coil copolymer, self-assembly, bimodal distribution, selectivity, branch number, branch length