Thermotropic polyesters: modelling of the meridional diffraction patterns of poly( p-oxybenzoate- co- p-phenylene isophthalate) fibres

Previous work has shown that poly( p-oxybenzoate- co- p-phenylene isophthalate) ( 50 50 and 67 33 ) fibres spun from nematic mesophase are highly oriented but lack crystalline order. Heat treatment of these ‘as-made’ fibres results in structure regarded as a mosaic of thin crystalline regions consis...

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Bibliographic Details
Published in:Polymer (Guilford) 1990, Vol.31 (1), p.8-14
Main Authors: Johnson, D.J., Karacan, I., Tomka, J.G.
Format: Article
Language:English
Subjects:
Applied sciences
aromatic polyesters
chain modelling
Exact sciences and technology
liquid crystalline
nematic
Organic polymers
Physicochemistry of polymers
Properties and characterization
Structure, morphology and analysis
thermotropic
X-ray diffraction
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Summary:Previous work has shown that poly( p-oxybenzoate- co- p-phenylene isophthalate) ( 50 50 and 67 33 ) fibres spun from nematic mesophase are highly oriented but lack crystalline order. Heat treatment of these ‘as-made’ fibres results in structure regarded as a mosaic of thin crystalline regions consisting of p-phenylene isophthalate sequences in a paracrystalline matrix. This work is concerned with atomic modelling of the copolymer chains. One-dimensional Fourier transforms generated from the models are compared with the observed meridional diffraction traces of the ‘as-made’ fibres. A good match is obtained for the extended chain models containing ‘ trans’ conformations of p-oxybenzoate and p-phenylene dioxy units.
ISSN:0032-3861
1873-2291
DOI:10.1016/0032-3861(90)90340-5