Estimation of Concentration of Particles in Polymerizing Fluid during Centrifugal Casting of Functionally Graded Polymer Composites |
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Authors: | S A R Hashmi U K Dwivedi |
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Affiliation: | (1) Polymer Composite Group, Regional Research Laboratory, Hoshangabad Road, Bhopal, 462026, India |
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Abstract: | The concentration of uniformly distributed particles in a fluid changes with time in the direction of gravitational or centrifugal
force to form a concentration gradient. The change in the concentration is an outcome of velocity variation of particles in
a fluid. A modified equation for terminal velocity, v
m of particles in polymerizing-fluid under centrifugal force is proposed to estimate the changes in the volume fraction of
particles in the graded composites. The proposed equation introduces the effect of cure kinetics of polymer and its effect
on particle movement in the model that was based on the modified Stoke’s law, considering the parameters related to particle
hindrance, centrifugal force, particle dimensions, viscosity variation etc. The model predictions of concentration changes
at the different locations of samples were compared with calcium carbonate filled polysulphide-modified-epoxy graded composites
prepared by centrifugal casting.. The effect of particle size, delayed curing rate of matrix were explored. The simulated
results are in good agreement with those of experiments. |
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Keywords: | centrifugal casting functionally graded composites epoxy resin concentration profile calcium carbonate particle motion |
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