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Preparation of carbon black/polypropylene nanocomposite with low percolation threshold using mild blending method
Author(s) -
Li Wei,
Liu ZhengYing,
Yang MingBo
Publication year - 2009
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.30202
Subject(s) - materials science , carbon black , polypropylene , nanocomposite , percolation threshold , suspension (topology) , composite material , aqueous solution , percolation (cognitive psychology) , compounding , polymer chemistry , chemical engineering , electrical resistivity and conductivity , chemistry , natural rubber , mathematics , engineering , neuroscience , homotopy , pure mathematics , electrical engineering , biology
A new approach, mild blending method, to prepare carbon black (CB) filled polypropylene (PP) nanocomposite using CB aqueous suspension was reported in this study. In this compounding process, the CB particles were first dispersed in aqueous suspension by using an ultrasonic irradiation. Subsequently, the CB suspension was blended with melting PP using an extruder with low shear strength screw configuration, followed by removing the vapor from the vent by vacuum. The morphological observation showed that the CB particles were dispersed at a nanometer level in the nanocomposites as they were in aqueous suspension and distributed homogeneously in PP matrix. The CB/PP nanocomposite prepared by this method exhibited a very low percolation threshold, i.e., 2.49 vol %, and a high‐critical resistance exponent t ( t = 5.82). These phenomena, which deviated from the classical percolation theory, were likely to come down to the homogeneous distribution of CB particles and the tunneling conduction. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2010