The hot water resistances of three kinds of short glass fiber or glass bead-reinforced plastics [polyphenyleneether (PPE), polyphenylenesulfide (PPS), and polyoxymethylene (POM)] were studied by hot water immersion tests and tensile tests. It was found that the tensile strengths of these plastics decreased and that the change of the strength was most remarkable in glass fiber-reinforced PPS (GF-PPS). Scanning electron microscope (SEM) observations of the tensile fracture surface revealed that the change in tensile strength was attributable to the deterioration of the interface between the glass fiber and the matrix resin. Although the change in the tensile strength of glass fiber-reinforced PPE (GF-PPE) was small compared with that of GF-PPS, debonding between the glass fiber and the matrix resin and surface cracks were observed on the surface of the GF-PPE specimens.
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