title: Helical nanocomposites from chiral block copolymer templates.
abstract: Three-dimensional hexagonally packed PLLA nanohelices in the PS matrix were formed in the self-assembly of PS-PLLA chiral block copolymer. After hydrolysis of the PLLA blocks, PS with hexagonally packed helical nanochannels can be fabricated and treated as the template for the following sol-gel process. Subsequently, silica precursor mixture was introduced into the PS template by a pore-filling process. Well-defined helical nanocomposites with SiO(2) inorganic nanohelices orderly dispersed in polymeric matrix can be successfully obtained after the sol-gel process. As a result, with the combination of the self-assembly of degradable block copolymers and sol-gel chemistry, we suggest a novel method for the preparation of the helical nanocomposites with ordered texture.
authors.affiliation: Department of Chemical Engineering, National Tsing Hua University, Hsinchu 30013, Taiwan.
authors.forename: Wen-Hsien
authors.initials: WH
authors.lastname: Tseng
authors.forename: Chun-Ku
authors.initials: CK
authors.lastname: Chen
authors.forename: Yeo-Wan
authors.initials: YW
authors.lastname: Chiang
authors.forename: Rong-Ming
authors.initials: RM
authors.lastname: Ho
authors.forename: Satoshi
authors.initials: S
authors.lastname: Akasaka
authors.forename: Hirokazu
authors.initials: H
authors.lastname: Hasegawa
mesh_terms: D008855:Microscopy, Electron, Scanning; D046529:Microscopy, Electron, Transmission; D053761:Nanocomposites / Q000737:chemistry* / Q000648:ultrastructure*; D011108:Polymers / Q000737:chemistry*; D013057:Spectrum Analysis; D013237:Stereoisomerism
chemical_list: D011108:Polymers