Abstract
Transition of the agglomerated state of particles in a molten polymer was investigated in dispersion and re‐agglomeration processes. Moreover, the relationship between the number of agglomerated particles and shear viscosity was discussed. A steady shear was applied to the molten polymer containing spherical fine particles by using a cone plate type rheometer. Then, the number of agglomerated particles in a solidified polymer was evaluated. It was found that the dispersion behavior of agglomerated particles could well explain with strain, i.e. the deformation of a polymer. In the re‐agglomeration process, the agglomerated number increased slowly compared with shear viscosity in case the shear rate in dispersion was large. It suggests that the inner structure of the polymer was maintained to a relatively high shear rate by coexistence of particles. When dispersed at further high shear rate, the agglomerated structure after the dispersion changed significantly and, as a result, the re‐agglomeration rate was drastically reduced.
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