SYNTHESIS OF BLOCK COPOLYMERS CONTAINING POLY (METHYL METHACRYLATE) CHAIN

嵌段共聚物是一种新型的高分子材料，其合成需要选择合适的引发剂，使相应的单体发生活性聚合。我们已经发现金属卟啉是多种单体活性聚合的优良引发剂。本研究的目的是建立一种合成方法，含有甲基丙烯酸甲酯作为一个组成部分的嵌段共聚物，鉴于聚（甲基丙烯酸甲酯）的工业重要性。结果表明，以铝卟啉为引发剂，成功地合成了甲基丙烯酸甲酯与甲基丙烯酸烷基酯、丙烯酸烷基酯、甲基丙烯腈的嵌段共聚物。在这些嵌段共聚物中，甲基丙烯酸甲酯-甲基丙烯腈共聚物的性质特别令人感兴趣，因为它在适当的溶剂中形成胶束。该嵌段聚合物具有微相分离的结构，表明该嵌段聚合物有可能应用于新型聚合物材料。

Block copolymesrs with chains of defferent structures in a molecule are expected as new polymer materials, and the syntheses require the selection of appropriate initiators for the living polymerization of corresponding monomers. We have already found that metalloporphyrins are excellent initiators for the living polymerization of a wide variety of monomers. The purpose of the present research is to establish the method of synthesis of block copolymers containing methyl methacrylate as a component, in view of industrial importance of poly (methyl methacrylate). As the result, we succeeded in the syntheses of block copolymers from methyl methacrylate and other alkyl methacrylates, alkyl acrylates, and methacrylonitrile, using aluminium polphyrin as initiator. Among these block copolymers, the property of methyl methacrylate-methacrylonitrile copolymer is of particular interest, in that it forms micelles in appropriate solvents. The cast film exhibits a microphase separated structure, indicating the possibility of this block cspolymer for application to novel polymer materials.