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|Title:||Investigation of the effect of an ether moiety on the liquid crystallinity by thin film polymerization|
Liquid-crystalline polymers (LCP)
|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. https://doi.org/10.1002/1521-3935(20020101)203:13.0.CO;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|
|Appears in Collections:||Staff Publications|
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