Barus effect in nylon 6 polymer melts

摘要

AbstractThe maximum diameter of broadening of nylon 6 polymer melts due to the Barus effectdmaxwere measured under various conditions of spinneret die dimensions and polymer temperatures. The results obtained were formulated and compared with the typical past theories on the mechanism of occurrence of the Barus effect. The Barus effect was formulated by using the relation between stress and strain in the theory of rubber elasticity:documentclass{article}pagestyle{empty}begin{document}$$frac{{tau _{rm s} }}{T} = {rm const}.left( {lambda ^2 - frac{1}{lambda }} right) = {rm const}.left( {frac{{d_{max } }}{{d_0 }}} right)^4 - left( {frac{{d_0 }}{{d_{max } }}} right)^2 $$end{document}where τsis the shear stress generated inside the spinneret die,Tis the absolute temperature of polymer melts, λ is the elongation ratio parallel to the polymer stream, andd0is the diameter of spinneret die. This formula coincides with the experimental result