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Hyperbranched Polycoumarates with Photofunctional Multiple Shape Memory
Author(s) -
Wang SiQian,
Kaneko Daisaku,
Okajima Maiko,
Yasaki Katsuaki,
Tateyama Seiji,
Kaneko Tatsuo
Publication year - 2013
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201305647
Subject(s) - cycloaddition , elastomer , shape memory alloy , materials science , glass transition , shape memory polymer , composite material , irradiation , shape change , chemical engineering , polymer , chemistry , organic chemistry , physics , biophysics , nuclear physics , engineering , biology , catalysis
In good shape : The films of hyperbranched polycoumarate derivatives can undergo a reversible [2+2] cycloaddition under irradiation of UV light and behave like photomechanical elastomers. From a predetermined original shape A the photonically and thermally memorized shapes B and C were obtained. The original shape was recovered by photoirradiation (see picture; T g =glass transition temperature).