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Study of Transcrystallization in Polymer Composites

Published online by Cambridge University Press:  21 February 2011

Benjamin S. Hsiao  and
J. H. Eric
Benjamin S. Hsiao
Affiliation:
E. I. du Pont de Nemours & Company, Inc., Fibers Department, Pioneering Research Laboratory, Experimental Station, P.O. Box 80302, Wilmington, Delaware 19880-0302
J. H. Eric
Affiliation:
E. I. du Pont de Nemours & Company, Inc., Fibers Department, Pioneering Research Laboratory, Experimental Station, P.O. Box 80302, Wilmington, Delaware 19880-0302
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Abstract

Transcrystallization of semicrystalline polymers, such as PEEK, PEKK and PPS, in high performance composites has been investigated. It is found that PPDT aramid fiber and pitch-based carbon fiber induce a transcrystalline interphase in all three polymers, whereas in PAN-based carbon fiber and glass fiber systems, transcrystallization occurs only under specific circumstances. Epitaxy is used to explain the surface-induced transcrystalline interphase in the first case. In the latter case, transcrystallization is probably not due to epitaxy, but may be attributed to the thermal conductivity mismatch. Plasma treatment on the fiber surface showed a negligible effect on inducing transcrystallization, implying that surface-free energy was not important. A microdebonding test was adopted to evaluate the interfacial strength between the fiber and matrix. Our preliminary results did not reveal any effect on the fiber/matrix interfacial strength of transcrystallinity.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 170: Symposium N – Interfaces in Composites , 1989 , 117
Copyright
Copyright © Materials Research Society 1990

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