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E-Mail IMAGE: The UV-induced deformation of the polycinnamate was analyzed by time-resolved IR spectroscopy, and it was confirmed that photoexpansion occurred based on the trans-to-cis isomerization of main chain cinnamate units.... view more Credit: Image courtesy: Tatsuo Kaneko and Kenji Takada from Japan Advanced Institute of Science and Technology. A phenomenon of "photoexpansion" in hard plastic films with a high glass transition temperature in the dry state was established, which was essentially different from very soft actuators, such as elastomers or gels. The photoexpandi...