Synthesis of Side Chain Liquid Crystal Polymers by Living Ring Opening Metathesis Polymerization. 2. Influence of Molecular Weight, Polydispersity, and Flexible Spacer Length (n=9-12) on the Thermotropic behavior of the Resulting Plymers
MASSACHUSETTS INST OF TECH CAMBRIDGE DEPT OF CHEMISTRY
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The living ring opening metathesis polymerization of 5-carbon-4- METHOXY-4BIPHENYLYLoxyalkylbicylco2.2.1hept-2-ene 1-n, n9-12 with MoCH-t- BuNAr 0-t-Bu2 Ar2,6-C6H3-i-Pr2 is described. Polymers with degrees of polymerization from 5 to 100 and narrow molecular weight distributions MwMn1. 07-1.28 were obtained in high yield. All polymers exhibit side chain crystallization along with a nematic mesophase. Isotropization temperatures increase with increasing molecular weight and then become independent of molecular weight at approximately 30-50 repeat units. Side chain crystallization is suppressed as molecular weight increases.
- Organic Chemistry
- Polymer Chemistry