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Wall slip velocity measurement of molten polypropylene in capillary flow based on length‐corrected Mooney technique
Author(s) -
Ren Zhong,
Huang Xingyuan,
Liu Hesheng
Publication year - 2017
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.44589
Subject(s) - slip (aerodynamics) , rheology , slip ratio , materials science , capillary action , power law , polypropylene , shear rate , shear stress , composite material , mechanics , thermodynamics , physics , mathematics , statistics
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. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134 , 44589.