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Effects of formulation and processing parameters on the morphology of extruded polypropylene‐(waste ground rubber tire powder) foams
Author(s) -
Xin Zhen Xiang,
Zhang Zhen Xiu,
Pal Kaushik,
Lu Bing Xue,
Deng Xu,
Lee Sung Hyo,
Kim Jin Kuk
Publication year - 2009
Publication title -
journal of vinyl and additive technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.295
H-Index - 35
eISSN - 1548-0585
pISSN - 1083-5601
DOI - 10.1002/vnl.20191
Subject(s) - blowing agent , polypropylene , materials science , extrusion , composite material , plastics extrusion , void (composites) , natural rubber , foaming agent , porosity , polyurethane
This paper presents an experimental study of the foaming behavior of polypropylene (PP)/(waste ground rubber tire powder) (WGRT) blends when using a chemical blowing agent in an extrusion foaming process. The effects of formulations (i.e., WGRT content, blowing agent content, compatibilizer) and the processing parameters (i.e., die temperature, screw speed) on the void fraction, average cell size, cell density, and cell morphology of the PP/WGRT foams were investigated. The blowing agent loading affected the cell structure of the foams and the average cell size, and the void fraction increased with increasing blowing agent loading. Both increasing the screw speed and decreasing the die temperature could establish a high pressure drop in the extruder die, and these were beneficial to the foaming extrusion. J. VINYL ADDIT. TECHNOL., 2009. © 2009 Society of Plastics Engineers