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The influence of fillers on the post‐extrusion swelling (Barus effect) of polymer melts is explored with the use of three model fillers in poly(styrene–acrylonitrile). The filler effect is shown to be more complex than simple dilution of the polymer. The role of such factors as melt rigidity, tendency toward plug flow, trapping of matrix in filler aggregates, and filler migration are considered.
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Newman et al. (1965) studied this question.
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