Abstract
The realization of the outstanding properties of CNTs (carbon nanotubes) is constrained by their inherent tendency to agglomerate. Emulsion polymerization was used for synthesizing poly(styrene)/CNT nanocomposites with functionalized CNTs. Chain transfer agents (CTAs) were incorporated to control polymer molar mass and end-use properties. Data from electrical impedance spectroscopy (EIS) at variable frequencies were analyzed to characterize and elucidate the electrical characteristics of poly(styrene) (PS)/CNT nanocomposites. The incorporation of CNT in the polymer matrix even at modest concentrations enhanced the electrical properties of the non-conductive poly(styrene) significantly as revealed by EIS spectra. The use of CTA enabled modulation of polymer molar mass and variation in the electrical properties for PS/CNT relative to composites with no CTA. The electrical behavior of PS/CNT dispersion has been shown to depend both on the CNT concentration and molecular weight of the substrate. The equivalent electrical circuit (EEC) analyses with the corresponding system parameters enabled determination of relative CNT arrangements for different types of PS/CNT composites. TEM images confirmed the CNT positions within the composites and helped support interpretation of EIS/EEC data.
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Dumitrescu L, Wilson NR, Macpherson JV (2007) Functionalizing single-walled carbon nanotube networks: effect on electrical and electrochemical properties. J Phys Chem 111:12944–12953
Katz E, Willner I (2004) Biomolecule-functionalized carbon nanotubes: applications in nanobioelectronics. ChemPhysChem 5:1084–1104
Moniruzzaman M, Winey KI (2006) Polymer nanocomposites containing carbon nanotubes. Macromolecules 39:5194–5205
Olivé-Monllau R, Esplandiu MJ, Bartrolí J, Baeza M, Céspedes F (2010) Strategies for the optimization of carbon nanotube/polymer ratio in composite materials: applications as voltammetric sensors. Sensors Actuators B 146:353–360
Philip B, Abraham JK, Chandrasekhar A, Varadan VK (2003) Carbon nanotube/PMMA composite thin films for gas-sensing applications. Smart Mater Struct 12:935–939
Frankland SJV, Caglar A, Brenner DW, Griebel M (2002) Molecular simulation of the influence of chemical cross-link on the shear strength of CNT-polymer interface. J Phys Chem 106:3046–3048
Yu J, Grossiord N, Koning CE, Loos J (2007) Controlling the dispersion of multi-wall carbon nanotubes in aqueous surfactant solution. Carbon 45:618–623
Wang Y, Iqbal Z, Mitra S (2005) Rapidly functionalized, water-dispersed carbon nanotubes at high concentration. J Am Chem Soc 128:95–99
Khan MU, Gomes VG, Altarawneh IS (2010) Synthesizing polystyrene/carbon nanotube nanocomposites by emulsion polymerization with non-covalent and covalent functionalization. Carbon 48:2925–2933
Altarawneh I, Gomes VG, Srour M (2009) Polymer chain extension in semibatch emulsion polymerization with RAFT-based transfer agent: the influence of reaction conditions on polymerization rate and product properties. J Appl Polym Sci 114(4):2356–2372
O’Donnell KJ, Eric W (2010) Reversible addition–fragmentation chain transfer in microemulsions: effect of chain transfer agent aqueous solubility. Macromolecules 43(4):1730–1738
Akat H, Atilla MT, Filip DP, Yusuf Y (2008) Synthesis and characterization of polymer/clay nanocomposites by intercalated chain transfer agent. Eur Polym J 44:1949–1954
Volkov AA, Prokhorov AS (2003) Broadband dielectric spectroscopy of solids. Radiophys Quantum Electron 46:657–665
Cai M, Park SM (1996) Oxidation of zinc in alkaline solutions studied by electrochemical impedance spectroscopy. J Electrochem Soc 143:3895–902
Sherif EM, Park SM (2006) Effects of 1,4-naphthoquinone on aluminum corrosion in 0.50 M sodium chloride solutions. Electrochima Acta 51:1313–21
Scully JR (2000) Polarization resistance method for determination of instantaneous corrosion rates. Corrosion 56:199–218
Mansfeld F (1995) Use of electrochemical impedance spectroscopy for the study of corrosion protection by polymer coatings. J Appl Electrochem 25:187–202
Danzer MA, Hofer EP (2009) Analysis of the electrochemical behaviour of polymer electrolyte fuel cells using simple impedance models. J Power Sources 190:25–33
Vu QT, Pavlik M, Hebestreit N, Rammelt U, Plieth W, Pfleger J (2005) Nanocomposites based on titanium dioxide and polythiophene: structure and properties. React Funct Polym 65:69–77
Coster HGL, Chilcott TC, Coster ACF (1996) Impedance spectroscopy of interfaces, membranes and ultrastructures. Bioelectroch Bioener 40:79–98
Gojny FH, Wichmann MHG, Köpke U, Fiedler B, Schulte K (2004) Carbon nanotube-reinforced epoxy-composites—enhanced stiffness and fracture toughness at low nanotube contents. Compos Sci Technol 64:2363–71
Song PC, Liu CH, Fan SS (2006) Improving the thermal conductivity of nanocomposites by increasing the length efficiency of loading carbon nanotubes. Appl Phys Lett 88:153111-(1–3)
Jordan J, Jacob KI, Tannenbaum R, Sharaf MA, Jasiuk I (2005) Experimental trends in polymer nanocomposites—a review. Mater Sci Eng A 393:1–11
Benyahia B, Latifi MA, Fonteix C, Pla F, Nacef S (2010) Emulsion copolymerization of styrene and butyl acrylate in the presence of a chain transfer agent. Part 1: modelling and experimentation of batch and fedbatch processes. Chem Eng Sci 65:850–869
Gomes VG, Tjiam C (2014) Optimal operating strategies for emulsion polymerization with chain transfer agent. Ind Eng Chem Res 53:7526–7537
Mamunya Y (2011) Carbon nanotubes as conductive filler in segregated polymer composites—electrical properties. In Yellampalli S (ed) Carbon Nanotubes - Polymer Nanocomposites, Publisher:InTech. doi:10.5772/18878
Abouzari MRS, Berkemeier F, Schmitz G, Wilmer D (2009) On the physical interpretation of constant phase elements. Solid State Ionics 180:922–927
West AR, Sinclair DC, Hirose N (1997) Characterization of electrical materials, especially ferroelectrics, by impedance spectroscopy. J Electroceram 1:65–71
Chilcott TC, Wong ELS, Coster H, James M (2009) Ionic double layer of atomically flat gold formed on mica templates. Electrochim Acta 54:3766–3774
Abdollahi Z, Ghasemi S, Darestani M, Gomes VG (2014) Characterizing colloidal behavior of non-ionic emulsifiers in non-polar solvents using electrical impedance spectroscopy. Colloid Polym Sci 292:2695–2705
Ghasemi S, Abdollahi Z, Darestani M, Gomes VG (2015) Online monitoring of emulsion polymerization using electrical impedance spectroscopy. Polym Int 64:66–75
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The authors acknowledge the support from the Australian Research Council and fruitful discussions with Prof. Hans Coster.
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Khan, M.U., Darestani, M.T. & Gomes, V.G. Structure and electrochemical properties of polystyrene/CNT nanocomposites. J Solid State Electrochem 19, 3145–3156 (2015). https://doi.org/10.1007/s10008-015-2943-3
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DOI: https://doi.org/10.1007/s10008-015-2943-3