Synthesis of Side Chain Liquid Crystal Polymers by Living Ring Opening Metathesis Polymerization. 2. Influence of Molecular Weight, Polydispersity, and Flexible Spacer Length (n=9-12) on the Thermotropic behavior of the Resulting Plymers

Abstract

The living ring opening metathesis polymerization of 5-carbo(n-(4'- METHOXY-4BIPHENYLYLoxyalkyl)bicylco2.2.1hept-2-ene (1-n, n=9-12) with Mo(CH-t- Bu)(NAr) (0-t-Bu)2 (Ar=2,6-C6H3-i-Pr2) is described. Polymers with degrees of polymerization from 5 to 100 and narrow molecular weight distributions (Mw/Mn=1. 07-1.28) were obtained in high yield. All polymers exhibit side chain crystallization along with a nematic mesophase. Isotropization temperatures increase with increasing molecular weight and then become independent of molecular weight at approximately 30-50 repeat units. Side chain crystallization is suppressed as molecular weight increases.

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Mar 31, 1992
Accession Number
ADA248700

Entities

People

  • Coleen Pugh
  • Richard R. Schrock
  • Zen Komiya

Organizations

  • Massachusetts Institute of Technology

Tags

Communities of Interest

  • Weapons Technologies

DTIC Thesaurus Topics

  • Alcohols
  • Chemical Synthesis
  • Chemistry
  • Crystallization
  • Crystals
  • Glass Transition Temperature
  • Liquid Crystal Polymers
  • Liquid Crystals
  • Macromolecules
  • Massachusetts
  • Military Research
  • Molecular Weight
  • Phase Transformations
  • Polymers
  • Tank Guns
  • Transition Temperature
  • United States

Fields of Study

  • Chemistry

Readers

  • Polymer Science and Technology