Synthesis and Properties of Liquid Crystalline Polyurethanes from 4,4-bis (6-hydroxyhexoxy) Biphenyl and 3,3'-Dimethyl-4, 4’-Biphenylene Diisocyanate

Abstract:

A thermotropic liquid crystalline polyurethane (LCPU) was synthesized by the polyaddition reaction of 3,3'-dimethyl-4,4'-biphenylene diisocyanate (TODI) with 4,4-bis(6-hydroxyhexoxy)biphenyl (BHHBP). The liquid crystalline behavior of the polymer was investigated by differential scanning calorimetry (DSC), polarized optical microscopy (POM), wide angle X-ray diffraction (WAXD). The LCPU exhibited a nematic phase with a threaded texture and had a wide mesophase temperature range. And thermogravimetric analysis (TGA) indicated the decomposition temperature of the LCPU was >300°C. The observation of POM showed that the LCPU was a thermotropic nematic liquid crystalline polymer at certain temperature range.

• Periodical: Key Engineering Materials (Volumes 428-429)
• Pages: 144-149
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.428-429.144
• Online since: January 2010
• Authors: Xiao Dong Chen, Nan Qiao Zhou, Hai Zhang
• Keywords: Liquid Crystalline Polyurethane, Nematic Phase, Structure–Property Relations, Thermotropic Nematic Liquid Crystalline

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