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Phase identifications and monotropic transition behaviors in a thermotropic main-chain liquid crystalline polyether
Journal article   Peer reviewed

Phase identifications and monotropic transition behaviors in a thermotropic main-chain liquid crystalline polyether

Alexander J. Jing, Orawan Taikum, Christopher Y. Li, Frank W. Harris and Stephen Z.D. Cheng
Polymer (Guilford), v 43(12), pp 3431-3440
2002
DOI: https://doi.org/10.1016/S0032-3861(02)00159-3

Abstract

Main-chain liquid crystalline polyether Monotropic phase transition Phase structure
A thermotropic liquid crystalline (LC) polyether was synthesized by condensation polymerization of 1-(4-hydroxyphenyl-2-(2-methyl-4-hydroxypheyl)ethane) and α,ω-dibromononane, and abbreviated as MBPE-9. Multiple phase transitions were found via differential scanning calorimetry (DSC) upon heating and cooling. Based on wide-angle X-ray diffraction (WAXD) and polarized light microscopy (PLM) experiments, two monotropic LC nematic (N) and smectic phases and three crystalline (orthorhombic K 1, triclinic K 2 and triclinic K 3) phases were identified. A study on kinetics showed that only when the N phase formation rate was faster than the crystallization rate of K 1 phase which directly grew from the melt, the presence of the N phase could accelerate both the overall crystallization and the linear crystal growth rates of K 1 phase. In a narrow temperature region, two distinct crystal growth rates could be observed: one was directly from the isotropic melt, and another was from the N phase.

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Domestic collaboration
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Polymer Science
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