Anisotropic Photomechanical Response of Stretched Blend Film Made of Polycaprolactone-Polyvinyl Ether with Azobenzene Group as Side Chain

作者：Tanaka Shimon; Kim Hyun Kyoung; Sudo Astushi; Nishida Haruo; Endo Takeshi^*

来源：Macromolecular Chemistry and Physics, 2008, 209(20): 2071-2077.

DOI：10.1002/macp.200800215

• anisotropic photomechanical response
• azo polymers
• poly(vinyl ethers)

A rapid and reversible aniscitropic photomechanical response of polymer film was achieved by using uniaxially stretched blend film composed of polycaprolactone and poly(vinyl ether) with azobenzene moiety (Azo-PVE) as a side chain. The photomechanical response behavior of the film was studied under a constant tensile stress. The deformation or recovery was rapidly completed within at most 0.1 min of UV + Vis light irradiation being switched on or off, respectively. The anisotropy of deformation was confirmed on a stretched film subjected to light irradiation. The deformation was observed as a contraction in a direction parallel to the stretching direction and as an elongation in the perpendicular direction. The anisotropy of the photoresponse was remarkably observed with increase in the stretching ratio, reflecting the binding between amorphous areas by Azo-PVE long chains.

• 出版日期2008-10-22