The effects of ultrahigh shear rate and shear duration on mechanical properties of commercial polymers

摘要

Material manufacturers are forced to theorize the maximum shear rate limit that a polymeric material can withstand. The true shear rate limit of a material is rarely known. For the study effects of high shear rates and increased time of shearing on mechanical properties have been analyzed by creating a high shear region within an injection mold. Ultrahigh shear rates were created by reducing runner thickness. The effects of shear duration were analyzed by changing the length of the high shear region in the mold. The research looks at both glass-filled and unfilled polypropylene, nylon, and polycarbonate resins.