The Effect of Thermal Treatment on the Interface Strength in Graphite/ Polycarbonate Composites
MONSANTO RESEARCH CORP ST LOUIS MO
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Pronounced effects of thermal treatment on the properties of graphite Polycarbonate composites have been demonstrated and studied. At a 20 percent volume loading of random-in-plane, discontinuous fiber, both specimen strength and modulus were found to be very sensitive to initial molding temperature and to subsequent heat treatments. Scanning electron micrographs of tensile fracture surfaces show that the matrix adheres to the fibers more tenaciously and in greater quantities as the tensile strength increases. Preliminary diffraction evidence indicates that the polycarbonate has epitaxially crystallized on and around the graphite fibers in the case of the annealed samples. The increase in composite strength are attributed to increases in interface strength which arise from better wetting and partial crystallization of the interface.
- Laminates and Composite Materials