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Abstract When a stick-slip transition of an extremely large magnitude occurs in capillary flow of a highly entangled melt, a significant flow can be generated in the barrel. At a constant piston pressure, this barrel flow reduces the actual pressure available at the die entry that produces the capillary flow in the die. Experiments on linear monodisperse polybutadienes (PBd) show that a significant...
Abstract A systematic experimental investigation is carried out to clarify the nature of a well-known capillary flow phenomenon in linear monodisperse polybutadienes (PBd). By varying the surface condition and the die diameter, it is alluded that a spurt-like stick-slip transition actually results from a breakdown of chain entanglement between adsorbed and next-layer unbound chains. In other words,...
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