Suppression of Side Chain Crystallization and Transformation of Monotropic Mesophases into Enantiotropic Mesophases by Copolymerization of the Parent Polymers' Monomer Pairs Containing Constitutional Isomeric Mesogenic Side Groups
CASE WESTERN RESERVE UNIV CLEVELAND OH DEPT OF MACROMOLECULAR SCIENCE
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The synthesis and characterization of several copolymers based on the monomer pairs of 11-4-methoxy-4-oxy-alpha-methylstilbeneundecanyl methacrylate 4-11-MA and 11-4-oxy-4-methoxy-alpha-methylstilbeneundecanyl methacrylate 4-11-MA, 11-4-methoxy-4-oxy-alpha-methylstilbeneundecanyl acrylate 4-11-AC and 11-4-oxy-4-methoxy-alpha-methylstilbeneundecanyl acrylate 411-AC, and 8-4-methoxy-4-oxy-alpha-methylstilbeneoctyl acrylate 4-8-AC nd 8-4-methoxy-4-oxy-alpha-methylstilbeneoctyl acrylate 4-8-AC and 8-4-oxy-4methoxy-alpha-methylstilbeneoctyl acrylate 4-8-AC are described. In the case of polymers with poly-methacrylate backbones, the copolymerization of the two constitutional isomeric mesogenic monomers cancels the side chain crystallization tendency characteristic of their parent homopolymers. Subsequently, the copolymer presents a broader mesophase temperature range than any of the two parent homopolymers. In the case of polymers with polyacrylate backbones, copolymerization suppresses the tendency towards side chain crystallization and subsequently, transforms one or even two monotropic mesophases into enantiotropic mesophases.
- Polymer Chemistry