Physical-Chemical Studies of Solutions Processing of Nematic Polymers

Abstract

Investigations have involved solutions of the rodlike chain poly(1,4- phenylene-2,6-benzobisthiazole), PBT, and related copolymers containing a small fraction of the phenylene replaced by bipyridyl ether. Studies include: 1) The kinetics of polymerization of PBT in the nematic phase; 2) The supramolecular structure of PBT in solution; 3) The phase equilibria of blends of PBT and nylon in solution; 4) The rheological properties of blends of PBT and nylon in solution; and 5) The properties of fully aligned monodomains if nematic solutions of PBT. The polymerization kinetics of PBT did not show any change in rate at the isotropic to an anisotropic phase transition for the solutions studied. At higher conversions (above 90%), the polymerization rate constant decreased markedly. This is attributed to effects on the diffusion of the chains along their axes, and comparisons are made to available theoretical models.

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Document Details

Document Type
Technical Report
Publication Date
Feb 08, 1989
Accession Number
ADA205921

Entities

People

  • Guy C. Berry

Organizations

  • Carnegie Mellon University

Tags

DTIC Thesaurus Topics

  • Chemical Engineering
  • Chemistry
  • Composite Materials
  • Copolymers
  • Kinetics
  • Light Scattering
  • Macromolecules
  • Materials
  • Materials Engineering
  • Materials Science
  • Mechanical Properties
  • Molecules
  • Phase Transformations
  • Polymers
  • Scattering
  • Transitions
  • Viscosity

Fields of Study

  • Chemistry

Readers

  • Polymer Science and Technology

Technology Areas

  • Microelectronics