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This paper studied the effects of the content and the orientation of the disk shape fillers on the modulus of PP composites. The experimental results were compared with the theoretical calculations which included the three dimensional ellipsoids and analyzed by two aspect ratios, and proposed by Lee and his researchers. Mica and talc were used as disk shape fillers in the composites. The shapes of mica and talc were observed by SEM and aspect ratios were statistically calculated. For the case of mica, the average aspect ratios were and , and for the case of talc, they were and . Also, the effects of two aspect ratios and the content of filler on the mechanical properties were studied: For 30 wt% of mica, increased up to about 2.7 times, and for the other case of talc, increased up to about 2.3 times, respectively.

Empirical Study on the Effects of the Content and the Orientation of the Disk Shape Fillers on the Modulus of PP Composites