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Modifications in the mesogenic unit of poly(oxytetramethyleneoxycarbonyl-3-chloro-1,4-phenyleneoxyterephthaloyloxy-2-chloro-1,4-phenylenecarbonyl)

✍ Scribed by Javier del Pino; Marian A. Gómez; Gary Ellis; Carlos Marco; José G. Fatou

Publisher: John Wiley and Sons
Year: 1994
Tongue: English
Weight: 426 KB
Volume: 195
Category: Article
ISSN: 1022-1352
DOI: 10.1002/macp.1994.021950614

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✦ Synopsis

Abstract

The effect of asymmetrical chlorine substitution in the mesogenic unit of poly(oxytetramethyleneoxycarbonyl‐3‐chloro‐1,4‐phenyleneoxyterephthaloyloxy‐2‐chloro‐1,4‐phenylenecarbonyl) (1) has been studied by means of differential scanning calorimetry, optical microscopy and X‐ray diffraction. The polymer presents three‐dimensional ordering, in spite of the substitution, and shows a transition to a nematic mesophase at 274°C and to the isotropic melt at 319°C. As for the unsubstituted polymer poly(oxytetramethyleneoxycarbonyl‐1,4‐phenyleneoxyterephthaloyloxy‐1,4‐phenylenecarbonyl), two different crystalline forms have been observed and some information about their structure has been obtained by Fourier‐Transform Raman spectroscopy and ^13^C solid‐state nuclear magnetic resonance. First results indicate that the most important structural differences between both polymorphs occur in the mesogenic unit.

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