Effect of Polypyrrole on the Electrical, Dielectric and Mechanical Properties of Waterborne Epoxy Coatings

Thu Thuy Thai, Thuy Duong Nguyen, Thi Thu Trang Nguyen, Gia Vu Pham, Dai Lam Tran, Anh Son Nguyen


In this context, conducting composite based on waterborne epoxy system and polypyrrole (PPy) was investigated. The polypyrrole was synthesized by chemical oxidation polymerization. Its morphology and chemical structure were confirmed by using field emission scanning electron microscopy (FESEM) and Fourier transform infrared spectroscopy (FTIR). Then, PPy was well-dispersed in the epoxy coating and had a good compatibility with the matrix. The effects of PPy on dielectric, electrical and mechanical properties of epoxy/PPy composites was examined. The dielectric constant and electrical conductivity of the coatings increased with addition of PPy fillers. Over to 15 wt. % of PPy loading, the volume resistivity of samples slightly decreased from 6.7 × 1010 to 1.5 × 1010 Ω cm. In contrast, the presence of PPy diminished both impact and abrasion resistance of the epoxy/PPy composites, down to 160 kg cm and 10.2 L/mil, respectively, but they stayed acceptable for the coatings. The results reveal that the epoxy containing polypyrrole is suitable for various electrical and dielectric applications.


Polypyrrole, waterborne epoxy, dielectric, volume resistivity, impact strength, abrasion resistance.

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N. Kizildag, N. Ucar, A. Onen, I. Karacan. Polyacrylonitrile/polyaniline composite nanofiber webs with electrostatic discharge properties, Journal of composite materials, 50 (28) (2016) 3981-3994.

F. Shahzad, S.H. Lee, S.M. Hong, C.M. Koo. Segregated reduced graphene oxide polymer composite as a high performance electromagnetic interference shield, 44 (8) (2018) 4707-4719.

R. Schueler, J. Petermann, K. Schulte, H-P. Wentzel. Agglomeration and electrical percolation behavior of carbon black dispersed in epoxy resin, Journal of Applied Polymer Science, 63 (13) 1997, 1741-1746.

Y.J. Kim, T.S. Shin, H.D. Choi, J.H. Kwon, Y-C. Chung, H.G. Yoon. Electrical conductivity of chemically modified multiwalled carbon nanotube/epoxy composites, Carbon 43 (2005) 23-30.

H. Kim, Y. Miura, C.W. Macosko. Graphene/Polyurethane nanocomposites for improved gas barrier and electrical conductivity, Chemistry of Materials, 22 (2010) 3441-3450.

W.J. Kim, M. Taya, M.N. Nguyen. Electrical and thermal conductivities of a silver flake/thermosetting polymer matrix composite, Mechanics of Materials, 41 (2019) 1116-1124.

H. Deligoz, B. Tieke. Conducting composites of polyurethane resin and polypyrrole: solvent-free preparation, electrical, and mechanical properties, Macromolecular Material and Engineering, 291 (2006) 793-801.

A. Eftekhari. Enhanced stability and conductivity of polypyrrole film prepared electrochemically in the presence of centrifugal forces, Synthetic Metals 142 (2004) 305-308.

M-K. Song, Y-T. Kim, B-S. Kim, J. Kiim, K. Char, H-W. Rhee. Synthesis and characterization of soluble polypyrrole doped with alkylbenzensulfonic acids, Synthetic Metals, 141 (2004) 315-319.

P.Dutta, S.K. De. Electrical properties of polypyrrole doped with β-naphthalenesulfonicacid and polypyrrole-polymethyl methacrylate blends, Synthetic Metals, 139 (2003) 201-206.

A.F. Diaz, B. Hall. Mechanical properties of electrochemically prepared polypyrrole films, IBM Journal of Research and Development, 27 (4) (1983) 342-347.

X. Zhang, Z. Yan, J. Guo, Z. Liu, D. Jiang, Q. He, H. Wei, H. Gu, H.A. Colorado, X. Zhang, S. Wei, Z. Guo. Polypyrrole doped epoxy resin nanocomposites with enhanced mechanical properties and reduced flammability, Journal of Materials Chemistry C, 3 (2015) 162-176.

S. Abhijit, A.M. Prakash, V.A. Bambole. Effect of polypyrrole on the properties of conventional epoxy coatings, Pigment & Resin Technology, 42 (5) (2013) 317-325.

I.A. Mir, D. Kumar. Development of polypyrrole/epoxy composites as isotropically conductive adhesives, The Journal of Adhesion, 86 (4) (2010) 447-462.

C. Cassignol, M. Cavarero, A. Boudet, A. Ricard. Microstructure-conductivity relationship in conducting polypyrrole/epoxy composites, Polymer 40 (1999) 1139-1151.

F. Gubbels, S. Blacher, E. Vanlathem, R. Jerome. R. Deltour, F. Bouers, Ph. Teyssie. Design of electrical conductive composites: Key role of the morphology on the electrical properties of carbon black filled polymer blends, Marcomolecules, 28 (1995) 1559-1566.

M.D. Migahed, T. Fahmy, M. Ishra, A. Barakat. Preparation, characterization, and electrical conductivity of polypyrrole composite films, Polymer Testing 23 (2004) 361-365.

P. Dallas, D. Niarchos, D. Vrbanic, N. Boukos, S. Pejovnik, C. Trapalis, D. Petridis. Interfacial polymerization of pyrrole and in situ synthesis of polypyrrole/silver nanocomposites. Polymer, 48 (7) (2007) 2007-2013.

C-D. Liu, S-N. Lee, C-H. Ho, J-L. Han, K-H. Hsieh. Electrical properties of well-dispersed nanopolyaniline/epoxy hybrids prepared using an absorption-transferring process, The Journal of Physical Chemistry C, 112 (41) (2008) 15956-15960.

M. Rahman, C-W. Hsieh, C-T. Wang, B-R. Jian, W. Lee. Dielectric relaxation dynamics in liquid crystal-dye composites, Dyes and Pigments, 84 (2010) 128-133.

DOI: https://doi.org/10.15625/0868-3166/30/1/14582 Display counter: Abstract : 233 views. PDF : 115 views.


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