COMPUTATIONAL STUDY OF SHEAR-INDUCED CRYSTALLIZATION IN POLYMERS
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Processing conditions play an important role in the structure-property relationship of semicrystaltine polymers. The temperature and the deformation rate history can affect the growth and nucleation rate of crystallization for a semicrystalline polymer. The flout and heat transfer during processing can be strongly coupled to the equations of material kinetics for the polymer. In this study, the effect of this coupling on the crystallization of a semicrystalline polymer is studied in a driven cavity under nonisothermal conditions. The transient analysis of the flow of a polymeric melt is modeled as a power law fluid with temperature dependent viscosity. Results are shown for the evolution of crystallinity and strain rate with time for various velocities of the moving plate and aspect ratios of the cavity for polyethylene, a fast crystallizing polymer. The importance of coupling the effects of shear-induced crystallization, flow, and temperature is shown. © 1998, Taylor & Francis Group, LLC. All rights reserved.
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