Journal of Science  and Technology of Composites

Journal of Science and Technology of Composites

Effect of mixing time on rheological behavior and homogeneity of highly filled composites

Document Type : Research Paper

Authors
Department of Chemical Engineering, Imam Hossein University, Tehran, Iran.
Abstract
Highly filled composites consist of two components of polymer matrix and different fillers with a weight fraction of more than 30%. There are different methods for studying the slurry flow behavior. In this article, the effect of pre-shear on the viscosity and homogeneity of the composite slurry and the final product has been investigated. The Viscosity of highly filled composite slurry with different shear rates in the temperature range of 40˚C after mixing in composites binder / aluminum / ammonium perchlorate and (binder / aluminum / ammonium perchlorate with Cross-linking agent) with the use of a Brookfield rotary viscometer was measured. It was observed that the viscosity and its dependence on the shear rate correspond to the behavior of the pseudoplastic fluid. Using the equation of power law, determining and analyzing the parameters of viscosity index (k) and pseudoplastic index (n), it was shown that the rheological behavior of highly filled composite depends significantly on the physical interactions between the filler and the matrix. it was observed that after adding the curing agent, the viscosity of the highly filled composite increases rapidly, and this increase in viscosity is due to smaller solid particles, an increase in molecular weight, and the formation of crosslinks in the prepolymer structure. Investigating the effect of mixing time on product homogeneity showed that the most homogeneous product was obtained during the entire mixing process of 135 minutes.
Keywords

Subjects


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