Thermoplastic matrix phase transitions in a carbon fiber composite, studied by contact electrical resistivity measurement of the interface between two unbonded laminae

The contact electrical resistivity of the interface between two unbonded laminae was measured. The phase transitions of the thermoplastic matrix were expected to affect the number of contacts, thereby allowing the contact resistivity to be a sensitive indicator of the occurence of a phase transition. The fractional change in contact resistivity for the as-received prepeg during heating. The effect of the annealing temperature was shown.