title: Photochemically reversible liquefaction and solidification of multiazobenzene sugar-alcohol derivatives and application to reworkable adhesives.
abstract: Multiazobenzene compounds, hexakis-O-[4-(phenylazo)phenoxyalkylcarboxyl]-D-mannitols and hexakis-O-[4-(4-hexylphenylazo)phenoxyalkylcarboxyl]-D-mannitols, exhibit photochemically reversible liquefaction and solidification at room temperature. Their photochemical and thermal phase transitions were investigated in detail through thermal analysis, absorption spectroscopy, and dynamic viscoelasticity measurements, and were compared with those of other sugar-alcohol derivatives. Tensile shear strength tests were performed to determine the adhesions of the compounds sandwiched between two glass slides to determine whether the compounds were suitable for application as adhesives. The adhesions were varied by alternately irradiating the compounds with ultraviolet and visible light to photoinduce phase transitions. The azobenzene hexyl tails, lengths of the methylene spacers, and differences in the sugar-alcohol structures affected the photoresponsive properties of the compounds.
authors.affiliation: Nanosystem Research Institute, National Institute of Advanced Industrial Science and Technology (AIST) , Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan.
authors.forename: Haruhisa
authors.initials: H
authors.lastname: Akiyama
authors.forename: Satoshi
authors.initials: S
authors.lastname: Kanazawa
authors.forename: Yoko
authors.initials: Y
authors.lastname: Okuyama
authors.forename: Masaru
authors.initials: M
authors.lastname: Yoshida
authors.forename: Hideyuki
authors.initials: H
authors.lastname: Kihara
authors.forename: Hideki
authors.initials: H
authors.lastname: Nagai
authors.forename: Yasuo
authors.initials: Y
authors.lastname: Norikane
authors.forename: Reiko
authors.initials: R
authors.lastname: Azumi
mesh_terms: D000269:Adhesives / Q000737:chemistry*; D000438:Alcohols / Q000737:chemistry*; D001391:Azo Compounds / Q000737:chemistry*; D002241:Carbohydrates / Q000737:chemistry*; D004548:Elasticity; D007536:Isomerism; D008027:Light; D044367:Phase Transition; D044366:Transition Temperature; D014466:Ultraviolet Rays; D014783:Viscosity
chemical_list: D000269:Adhesives; D000438:Alcohols; D001391:Azo Compounds; D002241:Carbohydrates; C009850:azobenzene