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
Abstract
The synthesis and characterization of several copolymers based on the monomer pairs of 11-(4-methoxy-(4'-oxy)-alpha-methylstilbene)undecanyl methacrylate (4-11-MA) and 11-(4-oxy-(4'-methoxy)-alpha-methylstilbene)undecanyl methacrylate (4'-11-MA), 11-(4-methoxy-(4'-oxy)-alpha-methylstilbene)undecanyl acrylate (4-11-AC) and 11-(4-oxy-(4'-methoxy)-alpha-methylstilbene)undecanyl acrylate (4'11-AC), and 8-(4-methoxy-(4'-oxy)-alpha-methylstilbene(octyl acrylate (4-8-AC) nd 8-(4-methoxy-(4'-oxy)-alpha-methylstilbene(octyl acrylate (4-8-AC) and 8-(4-oxy-(4'methoxy)-alpha-methylstilbene)octyl 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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 21, 1988
- Accession Number
- ADA209066
Entities
People
- D. Tomazos
- Virgil Percec
Organizations
- Case Western Reserve University