Molecular engineering of liquid-crystalline polymers by living polymerization. Part 13.—Synthesis and living cationic polymerization of (S)-(–)-2-methylbutyl 4′-(ω-vinyloxy)alkoxybiphenyl-4-carboxylate with undecanyl and hexyl alkyl groups
- 1 January 1991
- journal article
- Published by Royal Society of Chemistry (RSC) in Journal of Materials Chemistry
- Vol. 1 (4), 611-619
- https://doi.org/10.1039/jm9910100611
Abstract
The synthesis and living cationic polymerization of (S)-(–)-2-methylbutyl 4′-(11-vinyloxy)undecyloxybiphenyl-4-carboxylate (13–11) and (S)-(–)-2-methylbutyl 4′-(6-vinyloxy)hexyloxybiphenyl-4-carboxylate (13–6) are described. Polymers with degrees of polymerization from 4 to 26 and polydispersities ⩽ 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(13–11) exhibits 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(13–11) with degrees of polymerization ⩽ 10 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. Regardless of the thermal history of the sample, poly(13–16) exhibits an enantiotropic sA phase, and the polymers with degrees of polymerization > 12 exhibit an enantiotropic sX mesophase as well.Keywords
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