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Polymers 2011, 3(2), 861-874; doi:10.3390/polym3020861
Article

Polarized Emission of Wholly Aromatic Bio-Based Copolyesters of a Liquid Crystalline Nature

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Received: 31 March 2011; in revised form: 3 May 2011 / Accepted: 12 May 2011 / Published: 16 May 2011
(This article belongs to the Special Issue Liquid Crystalline Polymers)
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Abstract: A novel thermotropic liquid crystalline polymers poly{3-benzylidene amino-4-hydroxybenzoic acid (3,4-BAHBA)-co-trans-4-hydroxycinnamic acid (4HCA: trans-coumaric acid)} (Poly(3,4-BAHBA-co-4HCA)), was synthesized by the thermal polycondensation of 4HCA and 3,4-BAHBA, which was synthesized by a reaction of 3-amino-4-hydroxybenzoic acid (3,4-AHBA) with benzaldehyde. When the 4HCA compositions of Poly(3,4-BAHBA-co-4HCA)s were above 55 mol%, the copolymers showed a nematic, liquid crystalline phase. Differential scanning calorimetry (DSC) measurements of the copolymers showed a high glass transition temperature of more than 100 °C, sufficient for use in engineering plastics. Furthermore, the copolymers showed photoluminescence in an N-methylpyrrolidone (NMP) solution under ultraviolet (UV) light with a wavelength of 365 nm. Oriented film of Poly(3,4-BAHBA-co-4HCA) with a 4HCA composition of 75 mol% emitted polarized light, which was confirmed by fluorescent spectroscopy equipped with parallel and crossed polarizers.
Keywords: copolymerization; liquid crystals; polarized light emission; fluorescence copolymerization; liquid crystals; polarized light emission; fluorescence
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

Kan, K.; Kaneko, D.; Kaneko, T. Polarized Emission of Wholly Aromatic Bio-Based Copolyesters of a Liquid Crystalline Nature. Polymers 2011, 3, 861-874.

AMA Style

Kan K, Kaneko D, Kaneko T. Polarized Emission of Wholly Aromatic Bio-Based Copolyesters of a Liquid Crystalline Nature. Polymers. 2011; 3(2):861-874.

Chicago/Turabian Style

Kan, Kai; Kaneko, Daisaku; Kaneko, Tatsuo. 2011. "Polarized Emission of Wholly Aromatic Bio-Based Copolyesters of a Liquid Crystalline Nature." Polymers 3, no. 2: 861-874.


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