The role of conductivity and molecular mobility on the photoanisotropic response of a new azo-polymer containing sulfonic groups

Sakinah Mohd Alauddin, Nurul Fadhilah Kamalul Aripin, T. S. Velayutham, Irakli Chaganava, Alfonso Martinez-Felipe* (Corresponding Author)

*Corresponding author for this work

Research output: Contribution to journalArticle

Abstract

We report the preparation of a new light-responsive side-chain terpolymer containing azobenzenes, as chromophoric components, sulfonic groups, as polar components, and methacrylate groups, as film forming components, and we provide a detailed characterisation of its thermal parameters, photoanisotropic character, dielectric response and optoelectronic properties. The poly[(4-methoxyazobenzene -4′-oxy) methacrylate]-co-poly[2-acrylamido-2-methyl-1-propanesulfonic acid]-co-poly[methyl methacrylate], MeOAzB/AMPS/MMA, was prepared by radical copolymerisation, possesses high thermal stability and is amorphous. Its high glass transition (Tg = 151 °C) is explained by steric effects (induced by the bulky azobenzenes) and hydrogen bonding (promoted by the polar sulfonic groups) near the polymeric backbone, which may also reduce the photoanisotropic efficiency. The transition between the energy levels of the azobenzenes (MeOAzB) in the terpolymer is controlled by p-type conductivity, and can be associated to motions in the side-chains containing the sulfonic groups (AMPS), which are locally activated below the MeOAzB/AMPS/MMA glass transition.
Original languageEnglish
Article number112268
Number of pages9
JournalJournal of Photochemistry and Photobiology A: Chemistry
Volume389
Early online date30 Nov 2019
DOIs
Publication statusPublished - 15 Feb 2020

    Fingerprint

Keywords

  • Azo-Polymers
  • Dielectric spectroscopy
  • UV-Vis spectrophotometry
  • Photoanisotropy
  • Trans-to-cisphotoisomerisation
  • Conductivity
  • CRYSTALLINE SIDE-CHAIN
  • METHYL-METHACRYLATE
  • BEHAVIOR
  • LIGHT
  • COPOLYMERS
  • DIELECTRIC-RELAXATION
  • PHOTOCHROMIC POLYMERS
  • VOLUME HOLOGRAPHIC STORAGE
  • THERMAL-PROPERTIES
  • AZOBENZENE
  • Trans-to-cis photoisomerisation

Cite this