Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7824912 | Polymer Testing | 2018 | 6 Pages |
Abstract
The influence of extrusion conditions (temperature ranging from 170 to 220â¯Â°C, loads varying from 1.2 to 12.5â¯kg) and high-density polyethylene (HDPE) content on swelling behavior of polyoxymethylene (POM)/ethylene-vinyl acetate copolymer (EVA)/HDPE blend melts was examined. It was found the melt die-swell ratio of the blends decreased approximately linearly with rise in temperature, while it increased as a quadratic function with increasing shear rate or shear stress. The melt die-swell ratio increased with increasing HDPE weight fraction under constant test temperature, and the effect of temperature on the sensitivity of the melt die-swell ratio to the HDPE weight fraction was insignificant, while the effect of load on the melt die-swell ratio was significant. The correlation between the melt die-swell ratio of the blends and the HDPE weight fraction followed a quadratic relation. The melt extrudate swell behavior mechanisms of the blends during the die extrusion flow are discussed.
Related Topics
Physical Sciences and Engineering
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Authors
Ji-Zhao Liang,