Cylindrical Nanostructure of Rigid-Rod POSS-Containing Polymethacrylate from a Star-Branched Block Copolymer

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• 作者：Raita Goseki ; Akira Hirao ; Masa-aki Kakimoto ; Teruaki Hayakawa
• 刊名：ACS Macro Letters
• 出版年：2013
• 出版时间：July 16, 2013
• 年：2013
• 卷：2
• 期：7
• 页码：625-629
• 全文大小：287K
• 年卷期：v.2,no.7(July 16, 2013)
• ISSN：2161-1653

文摘

A nanostructure consisting of rectangular polyhedral oligomeric silsesquioxane (POSS) nanodomains packed into a hexagonal lattice was observed in POSS-containing A₂B star-branched polymers. The A₂B 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 A₂B 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-b-PMAPOSS diblock copolymers, was formed owing to the curvature effect, which is the result of the branched architecture of the copolymer.