Synthesis of Block Copolymer with Self-immorative Block and Development of nano-structure

嵌段共聚物可以形成数十纳米尺度的有序自组装结构，可以应用于纳米结构物体的制备。 本研究合成了一种具有自分解结构的嵌段共聚物，即一个嵌段可以被光分解。 以端官能化聚氨酯为引发剂，通过端官能化聚氨酯的缩聚反应和甲基丙烯酸甲酯的原子转移自由基聚合反应（ATRP）制备了嵌段共聚物。 只有聚氨酯部分被365 nm紫外光照射分解和聚（甲基丙烯酸甲酯）部分被选择性地保留。 另一方面，通过250-400 nm的UV光照射，聚氨酯和聚（甲基丙烯酸甲酯）都被分解。

Block copolymer can form well-ordered self-assembled structure with tens of nanometer length scale, which can apply creation of nanostructure object. In this study, Novel block copolymer with a self-immolative moiety, that one block can decompose by light, was synthesized. The block copolymer was prepared by the polycondensation of end-functionalized polyurethane and atom transfer radical polymerization (ATRP) of methyl methacrylate by using the polyurethane as an initiator. Only polyurethane moiety was decomposed by 365 nm UV light irradiation and poly(methyl methacrylate) moiety was selectively remained. On the other hand, both of polyurethane and poly(methyl methacrylate) was decomposed by UV light irradiation of 250-400 nm.