Accession Number:

ADA248288

Title:

Molecular Engineering of Liquid Crystalline Polymers by Living Polymerization. 23. Synthesis and Characterization of AB Block Copolymers

Descriptive Note:

Technical rept.,

Corporate Author:

CASE WESTERN RESERVE UNIV CLEVELAND OH DEPT OF MACROMOLECULAR SCIENCE

Personal Author(s):

Report Date:

1992-03-27

Pagination or Media Count:

28.0

Abstract:

This paper describes the synthesis and characterization of AB block copolymers based on w-4-cyano-4-biphenyloxyalkyl vinyl ether 6-n with alkyl being ethyl 6-2, propyl 6-3, nonyl 6-9 and undecanyl 6-11 with 1H, 1H, 2H, 2H-perfluorodecyl vinyl ether CF8, poly6-n-b-CF8XY where XY refers to the weight ratio of the two segments, and of 2-4-biphenyloxyethyl vinyl ether BEVE with 1H, 1H, 2H, 2H-perfluoeodecyl vinyl ether, polyBEVE-b- CF8XY. They were prepared by living cationic polymerization and exhibit a narrow molecular weight distribution. All block copolymers display a microphase separated morphology when the A segment is in the liquid crystalline phase. Block copolymers based on 6-2, 6-3 and BEVE with CF8 exhibit a microphase separated morphology also in the melt phase of A and B block.

Subject Categories:

  • Polymer Chemistry

Distribution Statement:

APPROVED FOR PUBLIC RELEASE