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Digitale Medien

Thermal expansion of oriented liquid crystal copolyesters (1990)

Green, D. I. ; Orchard, G. A. J. ; Davies, G. R. ; [weitere]

Bognor Regis [u.a.] : Wiley-Blackwell

Journal of Polymer Science Part B: Polymer Physics 28 (1990), S. 2225-2231

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ISSN: 0887-6266

Schlagwort(e): Chemistry ; Polymer and Materials Science

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie , Physik

Notizen: The axial thermal expansion coefficients of a series of highly oriented thermotropic liquid crystal copolyesters with random phenylene-naphthalene main-chain sequences are reported. In common with many other highly oriented polymers the values are negative. Generally, there are two transitions in the slope of the expansion-temperature curves. The positions of these transitions are correlated with high activation energy relaxations in the mechanical spectra. Comparison of the thermal expansion properties determined by x-ray and macroscopic techniques on two of the samples reveals little difference between the bulk material and a unit with a segmental length of ten monomers.

Zusätzliches Material: 2 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/polb.1990.090281205

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Digitale Medien

Mechanical and dielectric relaxations in liquid crystalline copolyesters (1990)

Green, D. I. ; Davies, G. R. ; Ward, I. M. ; [weitere]

New York, NY : Wiley-Blackwell

Polymers for Advanced Technologies 1 (1990), S. 41-47

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ISSN: 1042-7147

Schlagwort(e): Chemistry ; Polymer and Materials Science

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie , Maschinenbau

Notizen: Dynamic mechanical measurements in tension and torsion on oriented tapes and monofilaments of a range of liquid crystalline polyesters have been combined with dielectric measurements to obtain a molecular understanding of the relaxation processes.This paper extends our previous work [1,2,3] on polyesters of hydroxybenzoic acid (HBA) and hydroxynaphthoic acid (HNA) to related polymers containing dihydroxynaphthalene (DHN) and terephthalic acid (TPA) or biphenyl (BP) and TPA in place of the HNA. It confirms the association of the β and γ processes with naphthyl and phenyl moieties but shows that the processes cannot be due simply to the independent motions of single units.

Zusätzliches Material: 9 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/pat.1990.220010107

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