共聚物
偶氮苯
聚苯乙烯
高分子化学
材料科学
苯乙烯
偶氮化合物
聚合
聚合物
复合材料
作者
Carsten Frenz,Andreas Fuchs,Hans‐Werner Schmidt,Ulrich Theissen,D. Haarer
标识
DOI:10.1002/macp.200400046
摘要
Abstract Summary: Diblock copolymers with a photoaddressable dispersed phase containing p ‐methoxy substituted azobenzene side groups and a polystyrene matrix were synthesized and characterized. The block copolymers were prepared by a sequential living anionic polymerization of butadiene and styrene. The poly(1,2‐butadiene) segment was hydroborated and the hydroxy‐functions converted by a polymeranalogous reaction with the azo chromophore as side groups. The block copolymers were synthesized with different compositions by varying the length of the polystyrene segment and the length of the functionalized segment in order to obtain different morphologies. In this paper, for the first time a comparison of the cis‐trans photo‐isomerization behavior and photoaddressing with respect to different morphologies of the block copolymers is presented. To complete the comparison, the corresponding homopolymer and a statistical copolymer were also synthesized and investigated. A different photoaddressing behavior between homopolymer, statistical copolymer and the block copolymers was observed. One principal difference and advantage for photo addressable block copolymers is the lack of a formation of surface gratings which occurs in homopolymers and statistical copolymers. TEM of a poly(1,2‐butadiene)‐ block ‐polystyrene copolymer containing azobenzene side‐groups. magnified image TEM of a poly(1,2‐butadiene)‐ block ‐polystyrene copolymer containing azobenzene side‐groups.
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