Affiliation:
1. Industrial Material Institute National Research Council of Canada 75 de Mortagne Blvd, Boucherville Quebec, J4B 6Y4, Canada
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.
Subject
Materials Chemistry,Polymers and Plastics,General Chemistry
Cited by
14 articles.
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