title: Hyperbranched polycoumarates with photofunctional multiple shape memory.
abstract: 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; Tg =glass transition temperature).
authors.affiliation: School of Materials Science, Advanced Institute of Science and Technology, 1-1Asahidai, Nomi, Ishikawa 923-1292 (Japan).
authors.forename: Si-Qian
authors.initials: SQ
authors.lastname: Wang
authors.forename: Daisaku
authors.initials: D
authors.lastname: Kaneko
authors.forename: Maiko
authors.initials: M
authors.lastname: Okajima
authors.forename: Katsuaki
authors.initials: K
authors.lastname: Yasaki
authors.forename: Seiji
authors.initials: S
authors.lastname: Tateyama
authors.forename: Tatsuo
authors.initials: T
authors.lastname: Kaneko
mesh_terms: D017076:Computer-Aided Design; D003373:Coumaric Acids / Q000138:chemical synthesis / Q000737:chemistry*; D055668:Photochemical Processes; D011108:Polymers / Q000138:chemical synthesis / Q000737:chemistry*
chemical_list: D003373:Coumaric Acids; D011108:Polymers
keywords: coumarates; photochemistry; polymers; smart materials