Synthesis and characterization of novel liquidcrystalline polyurethanes

M. T. Cidade; J. C. M. Bordado; J. Figueirinhas; A. F. Martins

doi:10.1080/02678299308026302

Synthesis and characterization of novel liquidcrystalline polyurethanes

M. T. Cidade, J. C. M. Bordado, J. Figueirinhas, A. F. Martins

DCM - Departamento de Ciência dos Materiais

Research output: Contribution to journal › Article › peer-review

10 Citations (Scopus)

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.

Original language	English
Pages (from-to)	295-300
Number of pages	6
Journal	Liquid Crystals
Volume	13
Issue number	2
DOIs	https://doi.org/10.1080/02678299308026302
Publication status	Published - 1 Jan 1993

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AU - Cidade, M. T.

AU - Bordado, J. C. M.

AU - Figueirinhas, J.

AU - Martins, A. F.

PY - 1993/1/1

Y1 - 1993/1/1

N2 - 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.

AB - 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.

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Synthesis and characterization of novel liquidcrystalline polyurethanes

Abstract

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