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A thermotropic poly(ether ketone) based on the p-quaterphenyl unit: evidence for a smectic C phase

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Abstract

High-temperature polycondensation of 4,4′-(hexafluoroisopropylidene)diphenol with the homologous series of bis(fluoroaryl)diketones FArCO[Ar]xCOArF (Ar = 1,4-phenylene, x = 1, 2, 3 or 4) affords polyetherketones [–OArC(CF3)2ArOArCOArxCOAr–]n. The polymers with x = 1–3 are conventional amorphous thermoplastics, but when x = 4 much more complex and unusual phase behaviour is seen. The thermophysical characteristics of this polymer have been investigated by DSC and by X-ray powder and fibre diffraction. The results are accounted for on the basis that cooling from the isotropic melt (which is present above 375 °C) leads to rapid formation of a smectic-C-type mesophase at around 330 °C, with higher levels of order developing more slowly over a broad temperature range between ca. 300 and 230 °C.

Graphical abstract: A thermotropic poly(ether ketone) based on the p-quaterphenyl unit: evidence for a smectic C phase

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Publication details

The article was received on 24 Sep 2019, accepted on 19 Nov 2019 and first published on 20 Nov 2019


Article type: Paper
DOI: 10.1039/C9PY01441A
Polym. Chem., 2019, Advance Article

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    A thermotropic poly(ether ketone) based on the p-quaterphenyl unit: evidence for a smectic C phase

    F. O. Oladoyinbo, D. F. Lewis, D. J. Blundell and H. M. Colquhoun, Polym. Chem., 2019, Advance Article , DOI: 10.1039/C9PY01441A

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