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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..
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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 photoexpanding hard actuators were expected to apply in the wide fields because they do not contain vaporable matters such as solvents and were much more thermoresistant than conventional ones. ....

Kosuke Okeyoshi , Hideyuki Murata , Tatsuo Kaneko , Gottfried Wagener , Timothy Deming , Kenji Takada , National Meeting , Research Assistant Professor Amit Kumar , Japan Advanced Institute Of Science , Chemical Society Of Japan , Hokkaido University , Japan Advanced Institute , Professor Tatsuo Kaneko , Assistant Professor Kenji Takada , Professor Hideyuki Murata , Associate Professor Kosuke Okeyoshi , Research Assistant Professor Amit , Biobased Polyesters , Mechanism Analysis , Time Resolved Measurements , Amorphous Polycinnamate Hard , Tokyo Tech , Polymer Chemistry , Assis Prof , Hokkaido Univ , Kagoshima Univ ,