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Effect of Functionalization of MWCNT on the Electrical Conductivity of CNT-Polymer Composites

Author(s):

Jyoti Bajpai , Department of Physics, DBS College, Kanpur, India; Barkha Awasthi, National Centre for Nanosciences & Nanotechnology, University of Mumbai, India; R S Yadav, DAV PG College, Kanpur, India; Nikhil Rastogi, School of Sciences, IFTM University, Moradabad, India

Keywords:

Functionalization of CNTs, Composites, Conductivity

Abstract

the chemical functionalization of CNTs is a well-known approach to control and engineer the interface for CNT-Polymer composites and surface functionalization of CNTs has been one of the important reasons for diverse results in reinforced CNT-polymer composites. The present work, the influence of functionalization of CNTs on the conductivity of CNT-Polymer composite has been studied systematically. CVD prepared MWCNTs are purified and then functionalized by three types of functionalizations, the hydroxyl OH, carboxyl COOH and the Silane O-Si-O. Further, composites with two polymers Polymethyl methacrylate (PMMA) and Polycarbonate (PC) are prepared using functionalized MWCNT with varying concentrations to see the effect on the conductivity of CNT-Polymer composites. Conductivity results show that for all cases of functionalizations, the conductivities for the PC polymer matrix are higher compared to the polymer matrix. Also, non-covalent functionalization adopted for the MWCNT (by –Si-O group) favors for achieving the enhancement in conductivity of the composites by about one order of magnitude compared to covalently bonded (OH and COOH groups). The other conclusion from the results is that the lowest percolation threshold does not ensure high value for the conductivity as observed for the case of composites with OH-MWCNT fillers. Waviness and geometric structure of CNTs, the extent of dispersion of CNTs in the polymer matrix also play a role on the conductivity of composites.

Other Details

Paper ID: IJSRDV5I21530
Published in: Volume : 5, Issue : 2
Publication Date: 01/05/2017
Page(s): 1817-1820

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