Authors: García M.; Eguiazábal J.; Nazábal J.

Source: Polymer International, Volume 53, Number 3, March 2004 , pp. 272-278(7)

Publisher: John Wiley & Sons, Ltd.

Abstract:

Composites based on the polysulfone of bisfenol A (PSF) and a liquid-crystalline copolyester (Rodrun 5000) were obtained by two processing methods, (1) direct injection moulding (DI) and (2) extrusion followed by injection moulding (PI), across the whole composition range. The blends were immiscible and showed two pure amorphous phases. The inferior mechanical properties of PI blends, and their more difficult processing, meant that the PI procedure is not suitable in these blends. The generally linear relationship of the Young's modulus of the DI blends is due to the counteracting effects of the large orientation of the skin and its low thickness. The improvement in notched impact strength of PSF on the addition of small amounts of LCP indicated an important reduction in its notch sensibility. The tensile strength behaviour was close to linearity, with the exception of the 20/80 blend in which it was synergistic. This had been seen in previous thermoplastic/LCP blends, and depicts a behaviour reminiscent of rubber-toughened blends. Copyright © 2004 Society of Chemical Industry

Keywords: polysulfone; liquid crystal polymer; blends; mechanical properties

Document Type: Research article

DOI: http://dx.doi.org/10.1002/pi.1333

Affiliations: 1: Departamento de Ciencia y Tecnología de Polímeros and Instituto de Materiales Poliméricos ‘Polymat’, Facultad de Química, UPV-EHU, PO Box 1072, 20080 San Sebastián, Spain

Publication date: 2004-03-01

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