1968-02-01

Chemical and Functional Responses to Brake Lining Cure Variations 680416

A study was made of the responses of pyrolytic gas chromatography (PGC) and the friction assessment screening test (FAST) to variations in curing conditions for a liquid, oil-modified, phenolic resin system. Both PGC, which characterizes the organic resin, and FAST, which characterizes the friction and wear properties, show systematic variations with changes in cure time and temperature. A linear relationship exists between the area of one PGC peak (phenol) and the wear as determined by the FAST procedure.
A chemical kinetic model is postulated which relates the concentration of phenol produced on pyrolysis to a function of cure time and temperature. An index of cure is introduced which defines the curing conditions in terms of a single parameter. The PGC phenol peak area, FAST friction, and FAST wear correlate well with this index of cure.

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