This article presents an experimental study on the foaming behavior of recyclable high-melt-strength (HMS) branched polypropylene (PP) with CO 2 as a blowing agent. The foamability of branched HMS PP has been evaluated using a tandem foaming extruder system. The effects of CO 2 and nucleating agent contents on the final foam characteristics have been thoroughly investigated. Low density (i.e., 12-14-fold), fine-celled (i.e., 10 7 -10 9 cells/cm 3 ) PP foams were successfully produced using a small amount of talc (i.e., 0.8 wt%) and 5 wt% CO 2 .
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Kaewmesri et al. (2006) studied this question.
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