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Effect of Physical Foaming Agents on the Viscosity of Various Polyolefin Resins

Journal of Cellular Plastics , Volume 40 (2): 131 – Mar 1, 2004

Details

Publisher
Sage Publications
Copyright
Copyright © 2004 by SAGE Publications
ISSN
0021-955X
eISSN
0021-955X
D.O.I.
10.1177/0021955X04041959
Publisher site
See Article on Publisher Site

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Effect of Physical Foaming Agents on the Viscosity of Various Polyolefin Resins

Abstract

The effect of temperature and type of physical foaming agent (HCFC-142b, n-pentane, and carbon dioxide) on the shear viscosity have been investigated for various types of polyolefin resins (PP, LLDPE, and HDPE). The viscosity changes have been monitored using a commercial on-line process control rheometer mounted on a twin-screw extruder. A plasticization index, based on the respective molecular weights of the foaming agent and the repeat unit of the polymer, is proposed. Comparison with an amorphous polymer, namely polystyrene, is also made for mixtures using the same physical foaming agents.
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