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Chemistry International

The News Magazine of IUPAC

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Volume 33, Issue 2


Relation between Rheological Properties and Foam Processability for Polypropylene

Published Online: 2011-03-01 | DOI: https://doi.org/10.1515/ci.2011.33.2.22b

Relation between Rheological Properties and Foam Processability for Polypropylene

Polypropylene (PP) foam is in great demand in industry for a variety of applications (e.g., automobile parts, food trays and packaging, insulators, and shock absorbers) because of its heat resistance, stiffness, and recyclability. However, it is difficult to obtain low-density foams with fine cell structure, especially from uncross-linked PP, because of the lack of melt elasticity. In this project, a newly developed processing modifier, acrylic-modified polytetrafluoroethylene (PTFE), will be employed to enhance the strain-hardening in elongational viscosity of PP. PTFE deforms into a fibrous structure during mixing in a molten PP, and the interdigitated network structure of the PTFE fibers is responsible for the marked strain-hardening. As a result, PP containing a small amount (0.5–5 wt%) of the modifier exhibits prominent melt tension with a small increase in shear viscosity. Further, foaming processability will be evaluated by various processing operations as follows: chemical blowing agent microfoaming by supercritical CO2, batch foaming, and continuous extrusion foaming.

For more information, contact Task Group Chair Masayuki Yamaguchi <m_yama@jaist.ac.jp>.


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About the article

Published Online: 2011-03-01

Published in Print: 2011-03-01

Citation Information: Chemistry International -- Newsmagazine for IUPAC, Volume 33, Issue 2, Pages 22–23, ISSN (Online) 1365-2192, ISSN (Print) 0193-6484, DOI: https://doi.org/10.1515/ci.2011.33.2.22b.

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