Abstract
The behavior of the particle agglomerate in a polymer melt in dispersion and agglomeration processes was investigated. In the dispersion process of particle agglomerates, number of agglomerated particles and shear viscosity of the mixture were decreased in a similar manner, and the agglomerated number was well correlated by applied strain. On the other hand, in the agglomeration process of having reduced the shear rate applied, agglomerated number was increased after the increase in shear viscosity, when the mixture contained particles at a high volume fraction. Such a delay will be caused by the interaction between polymer entanglement structure and agglomerated particles. The internal structure of the mixture of particle and polymer was discussed in the consideration of frequency dependency of tanδ. When applying shear at shear rate more than the frequency where tanδ showed the maximum, particle agglomerate was dispersed well, and the interaction between polymer and single particle mainly governs rheological behavior. In addition, if smaller shear rate was applied to the mixture after that, relaxation of entanglement structure will induce particle agglomeration.
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