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The use of birefringence for predicting the stiffness of injection moulded poly...
Neves, N. M.; Pouzada, A. S.; Voerman, J. H.; Powell, P. C.Polycarbonate discs were injection molded with different sets of molding conditions. The parameters studied were the flow rate, melt- and mold-temperature. The discs were subjected to three point support flexural tests. Those tests are specially intended for injection molded discs because of their inherent non-flatness. The through-thickness molecular orientation was assessed by birefringence measurements along...
On the effect of the fiber orientation on the flexural stiffness of injection m...
Neves, N. M.; Isdell, G.; Pouzada, A. S.; Powell, P. C.The through-thickness fiber orientation distribution of injection molded polycarbonate plates was experimentally determined by light reflection microscopy and manual digitization of polished cross sections. Fiber length distribution was determined by pyrolysis tests followed by image analysis. A statistical analysis was done to determine the confidence limits of the fiber orientation results. The fiber orientat...
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