Capturing the efficiency of a melt-mixing process for polymer processing

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Abstract

Polymer blends and composite materials are often produced by a melt-mixing process using equipment specially designed to mix high-viscosity fluids during laminar flow. The melt-mixing process can be classified into distributive and dispersive mixing. Distributive mixing includes stretching and folding of fluid elements and rearrangement of dispersed materials. Dispersive mixing is the size reduction of filler aggregates and/or liquid droplets in a matrix fluid. In order to optimize the design of a melt-mixing equipment, the evaluation of distributive and dispersive mixing is essential. In this paper, we consider fundamental aspects of melt-mixing, and experimental and computational approaches that have been reported in the literatures. Experimental observation of melt-mixing, by and large, provides rather limited information on the mixing process inside of equipment. Although a mixed material can be obtained under specified conditions and its physical properties can be directly measured, it is difficult for the mixing mechanism behind the final result to be inferred. Computational fluid dynamics complements this situation. Numerical simulation of a mixing process provides a non-invasive and detailed data in a equipment so that the quantitative measures for distributive and dispersive mixing can be obtained. We consider various quantitative measures that have been previously proposed to characterize distributive and dispersive mixing.

Original languageEnglish
Pages (from-to)831-839
Number of pages9
JournalJOURNAL OF CHEMICAL ENGINEERING OF JAPAN
Volume44
Issue number11
DOIs
Publication statusPublished - Nov 23 2011

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All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)

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