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Keywords:

  • atom transfer radical polymerization (ATRP);
  • dynamic light scattering;
  • graft copolymers;
  • morphology;
  • photoluminescence;
  • polythiophene

Abstract

Diethyleneglycol methylethermethacrylate(MeO2MA) and oligoethylene glycol methylethermethacrylate(OEGMA) are polymerized on polythiophene(PT) backbone to produce water-soluble PT-g-PMeO2MA(PTD) and PT-g-P(MeO2MA-co-OEGMA)(PTDO) using atom transfer radical polymerization. They are characterized by 1H NMR and GPC techniques. TEM micrographs indicate that PT-chains self-organize as nanospheres, and atomic force micrographs suggest that aggregated PT-chains are present at the centre surrounded by dispersed PMeO2MA fibers producing miceller-type aggregates. Dynamic light scattering study indicates an initial decrease followed by sharp increase of Z-average particle size of PTD with temperature for attaining lower critical solution temperature (LCST) at 20 °C. The LCST increases with OEGMA concentration in PTDO. The temperature dependent PL emission of PTD shows a minimum at 19 °C, followed by a sharp increase till 21 °C, and in the cooling cycle, it shows a complete reversibility. In the PTDO copolymers, the PL intensity shows the hike at progressively higher temperatures due to the increase of LCST with increasing OEGMA concentration. © 2012 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2013