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Synthesis and characterization of polystyrene-polyester liquid crystalline block copolymers

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Summary

Liquid crystalline (LC) block copolymers comprising polystyrene and LC polyester blocks were obtained by a three-step procedure. In a first step, hydroxyl-terminated oligoesters were obtained by polycondensation reaction of methylhydroquinone and 4,4′-dicarboxy-1, 10-dibenzoyloxydecane in pyridine solution in the presence of tosyl chloride and dimethylformamide. Hydroxyl-terminated oligoesters were then further polymerized with 4,4′-azo-bis(4-cyanopentanoyl chloride) to form azo-macroinitiators which, in a third step, were employed in the free-radical polymerization of styrene to form block copolymers. The thermal and LC properties of the copolymers are presented and discussed in terms of the dependence upon the molecular weight of the polystyrene block.

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Authors and Affiliations

  1. Instituto de Macromoléculas, Universidade Federal do Rio de Janeiro, PO Box 68525, 21945-970, Rio de Janeiro, Brazil

    S. H. Wang & F. M. B. Coutinho

  2. Dipartimento di Chimica e Chimica Industriale, Università di Pisa, Via Risorgimento 35, I-56126, Pisa, Italy

    G. Galli & E. Chiellini

Authors
  1. S. H. Wang
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  2. F. M. B. Coutinho
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  3. G. Galli
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  4. E. Chiellini
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Wang, S.H., Coutinho, F.M.B., Galli, G. et al. Synthesis and characterization of polystyrene-polyester liquid crystalline block copolymers. Polymer Bulletin 34, 531–537 (1995). https://doi.org/10.1007/BF00423348

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  • DOI: https://doi.org/10.1007/BF00423348

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