Dynamic-Mechanical Behavior of Hybrid Thermotropic Liquid Crystalline Block Copolymers

S. H. Wang, F. M.B. Coutinho

Research output: Contribution to journalArticlepeer-review

Abstract

The preparation and the dynamic-mechanical behavior of a novel class of liquid crystalline block copolymers is described. In a first step, hydroxyl terminated oligoesters were obtained by polycondensation reaction of methylhydroquinone and 4,4'-dicarboxy-1,10-dibenzoyloxydecane in pyridine solution in the presence of tosyl chloride and dimethylformamide. Hydroxyl terminated oligoesters were then further polymerized with 4,4'-azo-bis(4-cyanopentanoyl chloride) and, in a third step, the macroinitiators obtained were employed in the free-radical polymerization of styrene. The DMA analysis showed that the two different blocks were only partly compatible in the glassy and melt phases and underwent distinct phase transitions. The nematic-isotropic transition temperature of the polyester block was constant throughout the whole composition range and the phase transition enthalpy was directly proportional to the percent of the polyester block.

Original languageEnglish
Pages (from-to)405-413
Number of pages9
JournalMolecular Crystals and Liquid Crystals
Volume261
Issue number1
DOIs
Publication statusPublished - Mar 1995
Externally publishedYes

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