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Microcellular foamed polypropylene (PP)/SiO2composites were prepared by using micro-SiO2and nano-SiO2particles. The effects of the particle size of SiO2on the foaming behavior and mechanical properties of the composites were studied based on heterogeneous nucleation theory. The results showed that the silica facilitated the cell nucleation to some extent. The average cell size of 16.3 µm and the cell density of 4.46 × 107cells/cm3were achieved for the composite foam at the silica content of 4 wt.%. The plastic deformation of the PP was strongly constrained due to the presence of the nano-silica. The tensile and impact strength of the nano-SiO2composite foam are larger than those of the micro-SiO2composite foam due to the high crack propagation resistance in the microcellular PP/nano-SiO2composite.
From W. Gong 1 2 3 | K. J. Liu 3 | C. Zhang 2 | J. H. Zhu 2 | L. He 2
1Department of Material and Building Engineering, Guizhou Normal University, Guiyang, PRC
2National Engineering Research Center for Compounding and Modification Polymeric Materials, Guiyang, PRC
3School of Materials Science and Engineering, Shanghai Institute of Technology, Shanghai, PRC
2National Engineering Research Center for Compounding and Modification Polymeric Materials, Guiyang, PRC
3School of Materials Science and Engineering, Shanghai Institute of Technology, Shanghai, PRC
(Received 02.12.2010; accepted 26.06.2011)
Appeared in International Polymer Processing 2012/02, Page 181-186
DOI: 10.3139/217.2458
Direct link: http://www.polymer-process.com/IPP2458
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Foaming Behavior and Mechanical Properties of Microcellular PP/SiO2 Composites [387 KB]
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