Citation: Nan Li, Wei Cheng, Kun Ren, Feng Luo, Ke Wang, Qiang Fu. OSCILLATORY SHEAR-ACCELERATED EXFOLIATION OF GRAPHITE IN POLYPROPYLENE MELT DURING INJECTION MOLDING[J]. Chinese Journal of Polymer Science, ;2013, 31(1): 98-109. doi: 10.1007/s10118-013-1204-0 shu

OSCILLATORY SHEAR-ACCELERATED EXFOLIATION OF GRAPHITE IN POLYPROPYLENE MELT DURING INJECTION MOLDING

Received Date: 9 May 2012
Revised Date: 9 July 2012

Fund Project: The work was financially supported by the National Natural Science Foundation of China (No. 21074075) and the program for the new century excellent talents of ministry of education of China (NCET-11-0348).

In this study, good dispersion status of graphite in a nonpolar, intractable polymer, i.e. polypropylene (PP), was realized in melt processing by using a specific dynamic packing injection molding (DPIM) technique. The exfoliation extent of graphite increased remarkably from the skin zone to the core zone of the molded part, as confirmed by combination of WAXD, SEM and TEM analyses, indicating an accelerated exfoliation occurred during the DPIM processing. This phenomenon is due to decreased melt flow channel and increased melt viscosity as the solidification takes place from the wall into the center, which leads to greatly increased shear force. The good dispersion of graphite results in obvious reinforcements of both tensile strength and impact strength by adding moderate amount of graphite. The present study proposes a promising route for realizing the large-scale fabrication of structural parts of polymer/exfoliated-graphite nanocomposites with excellent mechanical properties.
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