Polycarbonate melt flow testing

Melt flow index, tensile and impact polycarbonate data were used to test the applicability of equations (41) and (41a), presented theoretically in Fig. 3. It should be noticed that, through all this work, when the property cannot be determined from the virgin polymer, equations (xxa), were used to fit the data. Consequently, the counting of the processing cycles started with n= 1. 

Figure 6.15 Melt Flow Index variation with filler composition for polycarbonate/glass fibers composite at 290°C and 1.2 kg test load condition for MFI using data from Ref. 31. (Reprinted from Ref. 51 with kind permission from Steinkopff Veriag Darmstadt, Germany.)...

ASTM D1238 standards were attempted when melt flow index testing the material and ground parts, but were found to be inadequate for the two polycarbonates and the ABS because the materials would not flow through the indexer. The materials were tested to find new temperatures to test the polycarbonates and ABS at so they would flow through the melt index tester at the desired speed. 

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