Accession Number:

ADA248700

Title:

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

Descriptive Note:

Technical rept.,

Corporate Author:

MASSACHUSETTS INST OF TECH CAMBRIDGE DEPT OF CHEMISTRY

Report Date:

1992-03-31

Pagination or Media Count:

27.0

Abstract:

The living ring opening metathesis polymerization of 5-carbon-4- METHOXY-4BIPHENYLYLoxyalkylbicylco2.2.1hept-2-ene 1-n, n9-12 with MoCH-t- BuNAr 0-t-Bu2 Ar2,6-C6H3-i-Pr2 is described. Polymers with degrees of polymerization from 5 to 100 and narrow molecular weight distributions MwMn1. 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.

Subject Categories:

  • Organic Chemistry
  • Polymer Chemistry

Distribution Statement:

APPROVED FOR PUBLIC RELEASE