Synthesis and characterization of novel liquidcrystalline polyurethanes
- 1 February 1993
- journal article
- preliminary communications
- Published by Taylor & Francis in Liquid Crystals
- Vol. 13 (2) , 295-300
- https://doi.org/10.1080/02678299308026302
Abstract
Novel polyurethanes have been synthesized by the condensation of two rigid diols, biphenyl-4,4′-diol (BPH(4,4′)D) and 4-hydroxyphenyl-4-hydroxybenzoate (4HPH4′HB), with the flexible hexamethylene diisocyanate (HDI). Their phase diagrams were established by means of differential scanning calorimetry, nuclear magnetic resonance and polarizing optical microscopy. Poly(4HPH4′HB/HDI) was found to display a nematic phase between 140 and 199°C; poly (BPH(4,4′)D/HDI) also exhibits a mesomorphic phase, but so far the nature of this phase has not been established.Keywords
This publication has 6 references indexed in Scilit:
- Polymers from multifunctional isocyanates. 5. Synthesis of liquid-crystalline polyurethanes from (methyl-substituted)diisocyanato-substituted benzoatesMacromolecules, 1991
- Development of crystallinity in a polyurethane containing mesogenic units. 1. Morphology and mechanismMacromolecules, 1990
- Thermal and rheological properties of a liquid-crystalline polyurethaneMacromolecules, 1989
- Infrared and x-ray diffraction studies of a semirigid polyurethaneMacromolecules, 1989
- Liquid crystalline polyurethane. Polyurethanes containing bis-(p-oxymethylphenyl) terephthalateJournal of Macromolecular Science: Part A - Chemistry, 1987
- NMR study of some thermotropic nematic polyesters with mesogenic elements and flexible spacers in the main chainMacromolecules, 1983