Kinetic studies on hot-stretching of polyacrylonitrile-based carbon fibers by using internal resistance heating Part 1 Changes in resistivity and strain

Author: Kim H.S.   Shioya M.   Takaku A.  

Publisher: Springer Publishing Company

ISSN: 0022-2461

Source: Journal of Materials Science, Vol.34, Iss.14, 1999-07, pp. : 3299-3306

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Abstract

The effects of the stretching stress applied during high temperature heat-treatment of polyacrylonitrile(PAN)-based carbon fibers on the structural development and the properties of the fibers were investigated kinetically using internal resistance heating. The temperature-time superposition could be applied to the changes in structural parameters, resistivity and tensile strength during heat-treatment using the same shift factors. The application of the stretching stress effectively reduced the fractions of slower rate processes and the activation energy of the structural development in the temperature region below about 1800°C, and also influenced on the structural features. The longitudinal strain induced during heat-treatment increased in proportion to the logarithmic treatment time, showing different kinetics from that of the structural development.

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