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修饰的聚丙烯中的热量和流变学的研究
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Polyolefins are by far the most widely used plastics in the world. The pursuit of better material properties and more intricate part shapes have led to rapid changes in the compositions of these materials. Unfortunately, testing has not kept pace with material changes. For example, materials which may pass simple tests such as melt flow index (MFI) may not perform properly, either in the molding process or as finished parts. In this study, a series of calorimetric and rheological tests (on both solid materials and melts) are performed on a series of modified polypropylenes and the results of the tests compared against the material modifications. The results indicate that DMA (solids rheology) and DSC are both quite sensitive to the subtle differences in the materials. While similar trends can be observed in the low shear rheological properties of the polymer melts, there is less correlation of these properties to the MFI values than would be anticipated. The thermal and rheological properties observed can be related to material characteristics such as composition, molecular weight, and molecular weight distribution. |
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2017-02-27 10:30:59, 330.35 K
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