The effect of die geometries and extrusion rates on melt strength of high melt strength polypropylene

Gupta, R and Bhattacharya, S 2007, 'The effect of die geometries and extrusion rates on melt strength of high melt strength polypropylene', Journal of Polymer Engineering, vol. 27, no. 2, pp. 89-105.


Document type: Journal Article
Collection: Journal Articles

Title The effect of die geometries and extrusion rates on melt strength of high melt strength polypropylene
Author(s) Gupta, R
Bhattacharya, S
Year 2007
Journal name Journal of Polymer Engineering
Volume number 27
Issue number 2
Start page 89
End page 105
Total pages 17
Publisher Freund Publishing House
Abstract The effect of die geometry on the melt strength of conventional and high melt strength polypropylene (HMS PP) was studied. It was found that the melt strength of highly elastic PP is sensitive to changes in die geometry and that die diameter has greater effect on melt strength than on the length of the die. The effect of die entrance angle on melt strength was also studied. No significant difference in melt strength was observed when die with different entrance angles was used. This may be because dies with high L/D ratio used in this study helped to relax the polymer and dissipate stresses caused by different entrance angles. Higher extrusion rates enhance the melt strength of PP because higher molecular orientations are developed in the entrance region of the die.
Subject Composite and Hybrid Materials
Polymers and Plastics
Keyword(s) Polyethylene
Behavior
Flow
Extensibility
Blends
ISSN 0334-6447
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Citation counts: TR Web of Science Citation Count  Cited 4 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 4 times in Scopus Article | Citations
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