New side-chain liquid crystalline terpolymers with anhydrous conductivity: effect of azobenzene substitution on light response and charge transfer

Sakinah Mohd Alauddin, A. Ramadan Ibrahim, Nurul Fadhilah Kamalul Aripin, Thamil Selvi Velayutham, Osama K. Abou-Zied, Alfonso Martinez-Felipe

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

We have prepared and characterised a series of side-chain liquid crystalline homopolymers and terpolymers containing different azobenzene derivatives (RAzB), sulfonic groups (2- acrylamido-2-methyl-1-propanesulfonic acid, AMPS), and methyl(methacrylate) groups (MMA), as monomeric units. We have evaluated the effect of different para-substitutes of 6- (4-azobenzene -4’-oxy)hexyl methacrylate, at the side chains, OCH3, NO2 and H, on the phase behaviour and conductivity of the new polymers. The copolymers can form smectic and nematic phases, depending on their composition, and have light responsiveness, conferred by the azobenzene chromophores. The terpolymer with methoxy terminations, MeOAzB/AMPS/MMA, exhibits the highest conductivity values of the series (10-2/10-3 S·cm-1 range) through liquid crystalline phases and with signs of decoupling from polymeric segmental motions. These materials are promising candidates to develop new light responsive polymeric electrolytes for electrochemical conversion devices in which ionic conductivity under anhydrous conditions can be controlled by their nanostructure.
Original languageEnglish
Article number110246
Number of pages10
JournalEuropean Polymer Journal
Volume146
Early online date5 Jan 2021
DOIs
Publication statusPublished - 5 Mar 2021

Keywords

  • side-chain liquid crystal polymers
  • Ionic conductivity
  • azobenzene
  • energy conversion
  • Polymer electrolytes

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