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Title
Japanese: 
English:Self-Assembly of FlexibleーSemiflexibleーFlexible TriblockCopolymers 
Author
Japanese: 古賀舞都, 阿部宏平, 佐藤和徳, 幸喜順, 姜聲敏, 坂尻浩一, 渡邊順次, 戸木田雅利.  
English: Maito Koga, Kohei Abe, Kazunori Satoh, jun koki, Sungmin Kang, Koichi Sakajiri, junji watanabe, Masatoshi Tokita.  
Language English 
Journal/Book name
Japanese: 
English:Macromolecules 
Volume, Number, Page Vol. 47        pp. 4438-4444
Published date June 20, 2014 
Publisher
Japanese: 
English:ACS Publications 
Conference name
Japanese: 
English: 
Conference site
Japanese: 
English: 
DOI https://doi.org/10.1021/ma500798z
Abstract The self-assembly of ABA triblock copolymers comprising flexible amorphous poly(ethyl methacrylate) (PEMA, A block) and semiflexible liquid crystal (LC) polyester (B block) was investigated for amorphous block volume fractions (φ) ranging from 20% to 80%. Two copolymer series with different LC block molecular weights (Mn,LC) were examined. At φ < 55%, block copolymers with Mn,LC = 11 600 formed lamellar microdomains in which LC segments mostly extended along the lamella normal but folded to fit in the lamellae. When φ was augmented, the LC segment fold (Nfold) increased to enhance the interface between the LC and amorphous segments and counterbalanced the increase in amorphous lamella thickness by reducing the LC lamella thickness. When φ > 68%, the LC lamellae were divided into cubes, transforming into spheres in the PEMA matrix. When Mn,LC decreased to 6300, the copolymers showed similar morphology. However, the lamellae adopted zigzag configurations showing a greater tilting angle between the lamella normal to the LC chain axis with increasing φ. Thus, the LC and PEMA segments enhanced their interface by mutually sliding along the chain axis instead of increasing Nfold.

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