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Flow‐induced crystallization of linear polyethylene above its normal melting point
Author(s) -
Tan Victor,
Gogos Costas G.
Publication year - 1976
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.760160709
Subject(s) - crystallization , materials science , linear low density polyethylene , rheometer , shear rate , melting point , polyethylene , viscosity , volumetric flow rate , thermodynamics , shear flow , flow (mathematics) , composite material , rheology , mechanics , physics
The phenomenon of flow‐induced crystallization was investigated using a linear polyethylene above its normal melting point flowing continuously in a Biconical Rheometer. It was found that the resin crystallized in the superheated state at rates which increased with increasing shear rate and decreasing temperature. A method of analysis of the temperature dependence of the various stages of flow induced crystallization is proposed. It deals with and attempts to explain the experimental fact that a higher viscosity enhances the rate of flow‐induced crystallization in contrast to the effect of viscosity on the rate of quiescent crystallization. Some of the flow‐induced crystallization samples were transparent and exhibited a high DSC thermogram “tail”.