Goseki Raita, Hirao Akira, Kakimoto Masa-Aki, Hayakawa Teruaki
Department of Organic, Polymeric Materials, Tokyo Institute of Technology, 2-12-1-S8-36 O-okayama, Meguro-ku, Tokyo 152-8552, Japan.
Institute of Polymer Science, Engineering, National Taiwan University, No. 1, Sec. 4, Roosevelt Road, Taipei 10617, Taiwan.
ACS Macro Lett. 2013 Jul 16;2(7):625-629. doi: 10.1021/mz400125t. Epub 2013 Jul 3.
A nanostructure consisting of rectangular polyhedral oligomeric silsesquioxane (POSS) nanodomains packed into a hexagonal lattice was observed in POSS-containing AB star-branched polymers. The AB star-branched polymers, which comprised polystyrene (A) and bulky POSS-containing poly(methacrylate) (PMAPOSS) (B) units, were synthesized by anionic polymerization and addition reaction. The self-assembled structures of the AB star-branched polymers were studied via transmission electron microscopy (TEM) and small- and wide-angle X-ray scattering (SAXS and WAXS, respectively). It was found that a rectangular nanostructure was packed into a hexagonal arrangement of nanodomains for a PMAPOSS volume fraction of 40 vol. % in the star-branched polymer. In addition, the cylinder-like nanostructure of bulky POSS observed, which is not observed in the case of PS--PMAPOSS diblock copolymers, was formed owing to the curvature effect, which is the result of the branched architecture of the copolymer.
在含倍半硅氧烷笼形齐聚物（POSS）的AB型星状支化聚合物中观察到一种纳米结构，该结构由填充成六方晶格的矩形多面体低聚倍半硅氧烷（POSS）纳米域组成。由聚苯乙烯（A）和含庞大POSS的聚甲基丙烯酸酯（PMAPOSS）（B）单元组成的AB型星状支化聚合物通过阴离子聚合和加成反应合成。通过透射电子显微镜（TEM）以及小角和广角X射线散射（分别为SAXS和WAXS）研究了AB型星状支化聚合物的自组装结构。研究发现，对于星状支化聚合物中PMAPOSS体积分数为40体积%的情况，矩形纳米结构以纳米域的六方排列形式堆积。此外，由于共聚物的支化结构所导致的曲率效应，形成了在PS-PMAPOSS二嵌段共聚物中未观察到的含庞大POSS的圆柱状纳米结构。
