Accession Number:

ADA229772

Title:

Molecular Engineering of Liquid Crystalline Polymers by Living Polymerization. 6. Influence of Molecular Weight on the Phase Transitions of a 1/1 Copolymer of 2-(4-Cyano-4'-Biphenyl)oxy)ethyl Vinyl Ether and 8-((4-Cyano- 4'-Biphenyl)oxy)octyl Vinyl Ether

Descriptive Note:

Technical rept.

Corporate Author:

CASE WESTERN RESERVE UNIV CLEVELAND OH DEPT OF MACROMOLECULAR SCIENCE

Personal Author(s):

Report Date:

1990-10-16

Pagination or Media Count:

10.0

Abstract:

A 11 molar ratio of 2-4-cyano-4-biphenyloxyethyl vinyl ether 6-2 and 8-4-cyano-4biphenyloxyoctyl vinyl ether 6-8 was cationically copolymerized with the initiating system CF3SO3HCH32S in methylene chloride at 0C. All copolymers present narrow molecular weight distributions, and number average molecular weights which exhibit a linear dependence on Msub zeroIsub zero. Copolymers with degrees of polymerization lower than 14 exhibit an enantiotrpic nematic mesophase regardless of the thermal history of the sample. Copolymers with higher molecular weights exhibit an inverse monotropic smectic-A and an enantiotropic nematic mesophase in the first heating scan and only enantiotropic nematic mesophase in the subsequent heating scans. TR

Subject Categories:

  • Organic Chemistry

Distribution Statement:

APPROVED FOR PUBLIC RELEASE