Photo-induced Microphase Separation in Azobenzene-containing Block Copolymers
발표자
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초록
내용
Photo-induced self-assembly in azobenzene containing block copolymer (BCP) films was studied to achieve long-range-ordered parallel cylinders. Poly(dimethylsiloxane)-b-poly((4(phenyldiazenyl)phenoxy) hexyl acrylates) (PDMS-b-PHeABs) were synthesized via an atom transfer radical polymerization. Especially for the PHeAB block, ultraviolet light irradiation causes the photo-isomerization from trans to cis form due to the torsional rotation of polymer chains, allowing the enhanced self-assemblies into long-range-ordered parallel cylinders. In addition, the glass transition temperature of soft PHeAB chains further decreases from 60 oC to 0 oC during this process. Our photo-induced self-assembly of azobenzene-containing BCP offers a facile directed orientation of microdomains upon a polarized light irradiation.