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Synthesis and characterization of biphasic liquid crystalline polysiloxanes containing 4-undecanyloxy-4′-cyanobiphenyl side-groups

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Summary

The synthesis and characterization of liquid crystalline polysiloxanes and copolysiloxanes containing 4-undecanyloxy-4′-cyanobiphenyl side-groups is presented. The polysiloxane presents a single glass transition temperature followed by a Sc and a SA mesophase. Copolysiloxanes presenting around 50% weight fraction of side-groups exhibit two glass transition temperatures i.e., one due to the independent motion of the main chain and the other due to the cooperative but independent motion of the side groups, and in addition to the Sc and SA phases exhibited by the homopolymer, present also side-chain crystallization.

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Correspondence to Virgil Percec.

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Hsu, C.S., Percec, V. Synthesis and characterization of biphasic liquid crystalline polysiloxanes containing 4-undecanyloxy-4′-cyanobiphenyl side-groups. Polymer Bulletin 18, 91–98 (1987). https://doi.org/10.1007/BF00261884

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Keywords

  • Polymer
  • Crystallization
  • Transition Temperature
  • Glass Transition
  • Glass Transition Temperature