Accession Number:

ADA242350

Title:

Molecular Engineering of Liquid Crystal Polymers by Lining Polymerization. 16. Tailor-Made sC* Mesophase in Copolymers of 4-((S-(-)-2- Methyl-1-Butyl)Oxycarbonyl)-4'-omega-Oxyalkyl-1-Vinyl Ether)Biphenyl With Undecanyl and Octyl Alkyl Groups

Descriptive Note:

Technical rept.,

Corporate Author:

CASE WESTERN RESERVE UNIV CLEVELAND OH DEPT OF MACROMOLECULAR SCIENCE

Report Date:

1991-10-30

Pagination or Media Count:

29.0

Abstract:

The synthesis and living cationic polymerization of 4-S--2- methyl-1-butyloxycarbonyl-4-8-oxyoctyl-1-vinyl etherbiphenyl are described. Polymers with degree of polymerization lower than 40 and polydispersities were synthesized and characterized by differential scanning calorimetry DSC and thermal optical polarized microscope. All polymers exhibit enantiotropic s sub A and s sub C mesophases. Polymers with degrees of polymerization higher than 17 exhibit also an enantiotropic unidentified s sub X mesophase. Copolymers of 14-8 with 4-S--2-methyl-1-butyloxycarbonyl-4-11-oxyundecanyl-1-vinyl ether biphenyl were synthesized to cover the entire range of composition at a degree of polymerization of 15. The phase behavior of these copolymers was investigated and demonstrated a behavior similar to an ideal solution derived from the structural units. This copolymerization experiment allowed the synthesis of copolymers exhibiting, depending on the composition, a s sub C mesophase from below 10 deg C to up to 50-80 deg C.

Subject Categories:

  • Polymer Chemistry

Distribution Statement:

APPROVED FOR PUBLIC RELEASE