Please use this identifier to cite or link to this item:;2-3
Title: Investigation of the effect of an ether moiety on the liquid crystallinity by thin film polymerization
Authors: Cheng, S.-X.
Chung, T.-S. 
Keywords: Liquid crystallinity
Liquid-crystalline polymers (LCP)
Thin films
Issue Date: 9-Jan-2002
Source: Cheng, S.-X.,Chung, T.-S. (2002-01-09). Investigation of the effect of an ether moiety on the liquid crystallinity by thin film polymerization. Macromolecular Chemistry and Physics 203 (1) : 122-128. ScholarBank@NUS Repository.;2-3
Abstract: The effect of an ether moiety on liquid crystallinity was determined by means of in situ thin film polymerization under a polarizing microscope with a heating stage. The polymerization system consists of p-acetoxybenzoic acid (ABA)/acetoxyacetanilide (AAA)/4,4′-oxybis(benzoic acid) (OBA). Because of the swivel structure introduced by the ether group in the OBA monomeric unit, there is a critical composition to form the mesogenic phase during the polymerization. Liquid crystallinity forms when the concentration of the OBA is lower than 25 mol-%. Surprisingly, both LC phase and crystalline phase appear simultaneously in the isotropic phase if the reaction system is at critical composition. In addition, we have observed the disclination strengths change from ±1 to ±1/2 with an increase in ether linkages in the polymerization systems where LC phases appear, which is quite different from the homopolymerization system containing rigid rod-like p-acetoxybenzoic acid (ABA) and other systems without ether linkages where their disclinations have strengths of ±1. Clearly, the chain structure not only determines the formation of liquid crystallinity but also affects the strength of disclinations and the annihilation process.
Source Title: Macromolecular Chemistry and Physics
ISSN: 10221352
DOI: 10.1002/1521-3935(20020101)203:13.0.CO;2-3
Appears in Collections:Staff Publications

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