Abstract
The distribution of fiber lengths in injection moldings of fiber reinforced composite materials was almost normal. Under the conditions for normal distribution, i. e., 3ν (standard deviation) ≅ L (average length), the equation of tensile strength reported by Yamaki becomes linear with regard to the parameter φ whichestimates the adhesion between filler and polymer and aspect ratio. According to this equation, the φ values of PC/GF and PP/GF prepared under various adhesive conditions were obtained. By using Cox's tensile strength equation assuming complete adhesion, φ0 was obtained and φ/φ0 was then caluculated. The results probably make possible the estimation of the effects of surface modifiers on adhesive conditions and the degree of adhesion.
