Accession Number : ADA293115

Title :   Molecular Engineering of Liquid Crystalline Polymers by 'Living' Polymerization 30. Synthesis and 'Living' Cationic Polymerization of (2R, 3S)-2-Fluoro-3-Methylpentyl 4'-(8-Vinyloxyoctyloxy) Biphenyl-4 Carboxylate and Its Copolymerization with (2R, 3S)-2-Fluoro-3- Methylpentyl 4'-(11-Vinyloxyundecanyloxy) Biphenyl-4-Carboxylate.

Corporate Author : CASE WESTERN RESERVE UNIV CLEVELAND OH DEPT OF MACROMOLECULAR SCIENCE

Personal Author(s) : Percec, V. ; Oda, H.

PDF Url : ADA293115

Report Date : 03 APR 1995

Pagination or Media Count : 28

Abstract : The synthesis and 'living' cationic polymerization of (2R, 3S)-2-fluoro-3-methylpentyl 4'-(8-vinyloxyoctyloxy)biphenyl-4-carboxylate (11-8) are described. Poly(11-8)s with degrees of polymerization from 4.3 to 15.7 and polydispersities less than or equal to 1.19 were synthesized and characterized by differential scanning calorimetry (DSC) and thermal optical polarized microscopy. All poly(11-8)s exhibit an enantiotropic S(sub c*) and an unidentified smectic (S(sub 1) phase. Poly(11-8)s with DP less than or equal 11.5 exhibit an additional enantiotropic unidentified smectic (S(sub 2)) phase. No S(sub A) phase could be detected in any of poly(11-8)s. The nature of mesophases exhibited by poly(11-8) was confirmed by the investigation of the phase diagram of the copolymers prepared from 11-8 and (2R, 3S)-2- fluoro-3-methylpentyl 4'-( 11 vinyloxyundecanyloxy)biphenyl-4 carboxylate (11-11). The S(sub c*) phase of these copolymers displays a continuous dependence of copolymer composition. jg

Descriptors :   *CATIONS, *POLYMERIZATION, *LIQUID CRYSTALS, SCANNING, THERMAL PROPERTIES, POLARIZATION, METHYL RADICALS, SYNTHESIS, MOLECULES, POLYMERS, COPOLYMERS, DISPLAY SYSTEMS, MICROSCOPY, OXYGEN, OPTICAL ANALYSIS, FLUORIDES, PHASE DIAGRAMS, OCTYL RADICALS, VINYL RADICALS, CALORIMETRY, BIPHENYL, COPOLYMERIZATION.

Subject Categories : Polymer Chemistry
      Inorganic Chemistry
      Physical Chemistry
      Crystallography

Distribution Statement : APPROVED FOR PUBLIC RELEASE