Polymer Liquid Crystals and Their Blends

Abstract

This chapter discusses structures and properties of polymer liquid crystals (PLC) and their blends. The molecular and phase structures, current and potential applications of PLCs are discussed. The hierarchical structures, LC phases, thermophysical, tribological, rheological, electrical, magnetic and optical properties are described. The existence of a number of LC phases and of hierarchical structures of LC materials has a number of consequences, including the following: phase diagrams of LC-containing systems are quite complicated. The blends have even more complicated phase diagrams, as found for blends of poly(ethylene terephthalate) (PET)/p-hydroxybenzoic acid (0.6PHB) with engineering polymers (EPs), for instance with polycarbonate. As for EP + PLC blends sometimes fillers (and/or other additives) are used as well. The elastic modulus and tensile strength of copolymers, blends exhibit typically similar behavior: an increase in the concentration of the LC component enhances the mechanical properties along the orientation direction first, but a further increase worsens these properties because of higher brittleness. Similarity between pure PLC copolymers and PLC-containing blends shows in results of cold working. Similar effects are observed when subjecting to drawing EP + PLC blends. Polymeric materials for optical applications have significant advantages in comparison with inorganic materials: low weights of optical components, good mechanical properties, and the ease of manufacturing parts even with complex geometries. Advantages of computer simulations and molecular dynamics (MD) simulations of PLCs are summarized.

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Title
Polymer Liquid Crystals and Their Blends
Book Title
Physical Properties of Polymers Handbook
Book DOI
10.1007/978-0-387-69002-5
Chapter DOI
10.1007/978-0-387-69002-5_41
Part of
Volume
Editors
  • James E. Mark Send Email (1)
  • Editor Affiliation
  • 1 Department of Chemistry, University of Cincinnati, Crosley Tower, Martin Luther King Drive, 45221-0172, Cincinnati, OH
  • Authors
  • Witold Brostow Send Email (2)
  • Author Affiliation
  • 2 Department of Materials Science and Engineering and Department of Physics, University of North Texas, 305310, 76203-5310, Denton, TX
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