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.
|Number of pages||9|
|Journal||Journal of Photochemistry and Photobiology A: Chemistry|
|Early online date||30 Nov 2019|
|Publication status||Published - 15 Feb 2020|
Bibliographical noteThis work was supported by the University Malaya under the UMRG grant RP038B-17AFR. NFKA and AMF would like to thank the Royal Academy of Engineering, U.K., and Academy of Science, Malaysia, for the grant NRCP1516/4/61, from the Newton Research Collaboration Programme, and the University of Aberdeen, for the award of the grant SF10192, corresponding to the Global Challenge Research Fund Internal Pump Priming Fund Round 2. AMF would like to acknowledge the Carnegie Trust for the Universities of Scotland for the award of one Scottish Research
Incentive Grant (RIG008586).
- Dielectric spectroscopy
- UV-Vis spectrophotometry
- CRYSTALLINE SIDE-CHAIN
- PHOTOCHROMIC POLYMERS
- VOLUME HOLOGRAPHIC STORAGE
- Trans-to-cis photoisomerisation