Polystyrene adsorbed multi-walled carbon nanotubes incorporated polymethylmethacrylate composites with modified percolat
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MRS Advances © 2017 Materials Research Society DOI: 10.1557/adv.2017.625
Polystyrene adsorbed multi-walled carbon nanotubes incorporated polymethylmethacrylate composites with modified percolation phenomena Tajamal Hussain1, Tayyaba Malik1, Adnan Mujahid1, Ghulam Mustafa2 1
Institute of Chemistry, University of the Punjab, Lahore-54590, Pakistan
2
Suleman Bin Abdullah Aba Al-khail Centre for Interdisciplinary Research in Basic Sciences, International Islamic University, Islamabad-44000, Pakistan
ABSTRACT
Extensive work has been done on the modification of multi-walled carbon nanotubes (MWCNTs) to improve their characteristics. Here, polystyrene (PS) was adsorbed on the surface of MWCNTs by dispersion process, using toluene as medium. PS modified MWCNTs (PS-MWCNTs) have been dispersed in polymethylmethacrylate (PMMA) matrix to prepare composite, PS-MWCNTs/PMMA. It is expected that PS adsorbed at the surface of the MWCNTs will help in improving the interaction between MWCNTs and PMMA which results uniform and homogeneous dispersion of the former in later. Thus, synthesized composites were characterized by UV-Vis and FTIR spectroscopy to monitor the functionality of developed product. Electrical parameters including conductivity and dielectric properties were measured with the help of LCR meter. Electrical characters of the composites were explored by investigating the effect of contents of PS-MWCNTs on conductivity and dielectric properties. Percolation behaviour was examined and calculated value of percolation threshold was 0.1wt%.
INTRODUCTION Two decades before, the term carbon nanotubes was first used to introduce a new carbon material having a diameter of nano range [1]. Two main types of carbon nanotubes (CNTs) are single-walled carbon nanotubes (SWCNTs) and multi-walled carbon nanotubes (MWCNTs) [2]. Both SWCNTs and MWCNTs show extraordinary chemical, mechanical and electrical properties in the form of their remarkable stability, good flexibility, high modulus and excellent electrical conductivity [3]. Among these types, MWCNTs play an important role in a lot of potential applications like nanoelectronics, sporting items and in aerospace [4]. MWCNTs enhance the properties of polymer when used in form of filler in polymer composites. Composites containing MWCNTs as filler are of great interest in both research and industry because of their amazing thermal, electrical and mechanical properties, low density and high aspect ratio. Among all the composites containing MWCNTs, composites of polymethylmethacrylate (PMMA) have gained much attention and are used as electromagnetic interference shielding materials, transparent conducting films and in gas sensors etc. [5]. Composites
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with different concentrations of MWCNTs show different behaviour. The greater amount of MWC
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