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>Wall slip velocity measurement of molten polypropylene in capillary flow based on length-corrected Mooney technique
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Wall slip velocity measurement of molten polypropylene in capillary flow based on length-corrected Mooney technique
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机译：Wall slip velocity measurement of molten polypropylene in capillary flow based on length-corrected Mooney technique
In this study, to measure wall slip velocity of molten polypropylene (PP) by using different length-to-diameter (L/D) ratios of capillary dies with fixed diameter, a length-corrected Mooney technique was proposed. Moreover, the effects of pressure, temperature, and L/D ratio were considered to better represent wall slip mechanism. To verify the feasibility of the length-corrected Mooney technique, a series of capillary rheological experiments for molten PP were carried out. Meanwhile, the power-law quantitative equations of slip velocity were established by shear stress. Moreover, the effects of L/D ratio and temperature on rheological properties of PP were investigated. In addition, numerical simulations for slip velocity and rheological properties of PP were performed. Numerical results validated that the length-corrected Mooney technique, and the power-law quantitative equations of slip velocity were available. Results showed that wall slip velocity of molten PP decreased with the capillary die's L/D ratio, but increased with the temperature and shear rate. (C) 2016 Wiley Periodicals, Inc.
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