Accession Number:

ADA235791

Title:

Molecular Engineering of Liquid Crystal Polymers by Living Polymerization. 13. Synthesis and Living Cationic Polymerization of 4-((S(-)-2- Methyl-1-Butyl)Oxycarbonyl)-4'-(omega-Oxyalkyl-1-Vinyl Ether)Biphenyl with Undecanyl and Hexyl Alkyl Groups

Descriptive Note:

Technical rept.

Corporate Author:

CASE WESTERN RESERVE UNIV CLEVELAND OH DEPT OF MACROMOLECULAR SCIENCE

Personal Author(s):

Report Date:

1991-04-10

Pagination or Media Count:

33.0

Abstract:

The synthesis and living cationic polymerization of 4-S--2-methyl- 1-butyloxycarbonyl-411-oxyundecanyl-1-vinyl etherbiphenyl 12-11 and 4-S-- 2-methyl-1-butyloxycarbonyl-4-6-oxyhexyl-1-vinyl etherbiphenyl 12-6 are described. Polymers with degrees of polymerization from four to twenty six and polydispersities equal and lower than 1.10 were synthesized and characterized by differential scanning calorimetry DSC and thermal optical polarized microscopy. When determined from first heating and cooling DSC scans, poly exhibit monotropic SA, SC and SX unidentified mesophases over the entire range of molecular weights. When determined from second and subsequent heating and first and subsequent cooling scans, poly with degrees of polymerization equal to ten and lower than ten exhibit enantiotropic SA, SC and SX mesophases, and crystallization on the heating scan, while those with higher degrees of polymerization exhibit enantiotropic SA, SC and SX mesophases only.

Subject Categories:

  • Organic Chemistry
  • Polymer Chemistry

Distribution Statement:

APPROVED FOR PUBLIC RELEASE