Journal
JOURNAL OF APPLIED POLYMER SCIENCE
Volume 80, Issue 10, Pages 1814-1824Publisher
JOHN WILEY & SONS INC
DOI: 10.1002/app.1277
Keywords
linear polycarbonate; branched polycarbonate; mechanical property; melt viscosity; melt tension
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A study of the mechanical and rheological properties of linear and branched polycarbonates blends is presented. Phase separations of the blends were checked through DSC and SEM, and, subsequently, mechanical and rheological properties were investigated. Phase separations were not observed in the blends. The mechanical properties were examined through tensile, flexural, and impact tests. All the mechanical properties of the blends were relatively independent of the compositions. For study of the rheological properties, melt viscosity, storage and loss moduli, and melt tension of the blends with various compositions were examined at various temperatures. The dependence of the viscosity on the molecular weight was also studied. As the content of branched polycarbonate increases, the dependence of the viscosity on the molecular weight and the shear thinning behavior became more marked. Melt tensions were also increased as the branched polycarbonate content increased in the blends for all tested temperatures. In this study, the blend systems which have same mechanical properties but different rheological properties can be obtained through blending of linear and branched polycarbonates. (C) 2001 John Wiley & Sons, Inc.
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