Abstract
An annular shear cell has been deployed to explore the influence of polymer structure on bulk attrition for various grades of high-density polyethylene, these grades differing in molecular weight and degree of chain branching. Decreased bulk attrition of coarse material was found, provided that the molecular weight was high. Polymer branching also served to reduce bulk attrition at low shear strain. The process of attrition caused fine products to be pressed into the clefts of large particles in addition to the general formation of free fine materials. Particles of intermediate size were made by fragmentation. The kinetics of attrition were not first order; an empirical formulation due to Gwyn was more satisfactory.
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