Solid State Science and Technology, Vol. 17, No 1 (2009) 12-21

ISSN 0128-7389



Mahnaz M.Abdia, Anuar B. Kassima, H.N.M. Ekramul Mahmudb, Wan Mahmood Mat Yunusc, Zainal Abidin Talibc

aDepartment of Chemistry, Faculty of Science, Universiti Putra Malaysia,

43400 Serdang, Selangor, Malaysia

bFaculty of Chemical Engineering, Universiti Teknologi MARA,

40450 Shah Alam, Selangor, Malaysia

cDepartment of Physics, Faculty of Science, Universiti Putra Malaysia,

43400 Serdang, Selangor, Malaysia



The polypyrrole-chitosan (PPy-CHI) composite films formed by electrochemical polymerization were studied by electrical and mechanical techniques. The electromagnetic interference shielding effectiveness (EMI SE) at the frequencies range from 8-12 GHz was also studied. It is shown by electrical conductivity measurement and DMA (dynamic mechanical analysis) that the enhanced conductivity and mechanical properties of the prepared films are due to the presence of CHI in the composite film. Most of the composite films had more than 98% shielding of electromagnetic energy. The EMI SE shown through reflection and absorption increased with the increase in conductivity and relative shielding efficiency by reflection and absorption can be easily controlled by the electrical conductivity.



[1]. H. K. Kim, M. S. Kim, S. Y. Chun, Y. H. Park, B. S. Jeon and J. Y. Lee (2003). Characteristics of electrically conducting polymer-coated textiles. Mol. Cryst. Liq. Cryst. 405, 161169.

[2]. Y. H. Park and J. S. Cheung (1989). Preparation electrical properties of Nylon6/PVA/Polypyrrole composites. J. Kor. Soc. Tex. Eng. Chem. 26, 6574.

[3]. M.S. Kim, H.K. Kim, S.W. Byun, S.H. Jeong, Y.K. Hong, J.S. Joo, K.T. Song, J.K. Kim, C.J. Lee, J.Y. Lee (2002). PET fabric/polypyrrole composite with high electrical conductivity for EMI shielding. Synth. Met. 126, 233239.

[4]. D.D.L. Chung (2001). Electromagnetic interference shielding effectiveness of carbon materials. Carbon, 39, 279285.

[5]. S. Yang, K. Lozano, A. Lomeli, H. D. Foltz and R. Jones (2005). Electromagnetic interference shielding effectiveness of carbon nanofiber/LCP composites. Composites: Part A, 36, 691697

[6]. V.V Sadchikov and Z.G Prudnikova (1997). Amorphous materials in electromagnetic shields. Stal. 4, 669.

[7]. C.S. Zhang, Q.Q. Ni, S.Y. Fu and K. Kurashiki (2007). Electromagnetic interference shielding effect of nanocomposites with carbon nanotube and shape memory polymer. Composites Science and Technology. 67, 29732980

[8]. S. Tan, M. Zhang and H. Zeng (1998). Electroconductive polymer composite for shielding EMI. Cailiao Gongcheng/ J Mater Eng. 5, 69.

[9]. Y. Wang and X. Jing (2005). Intrinsically conducting polymers for electromagnetic interference shielding. Polym Adv Technol. 16, 34451.

[10]. G. Lu, X. Li and H. Jiang (1996). Electrical and shielding properties of AB

resin filled with nickel-coated carbon fibers. Compos Sci Technol. 56, 193200.

[11]. F. Mohammad (1998). Compensation behaviour of electrically conductive polythiophene and polypyrrole. J Phys. D: Appl. Phys. 31, 951-959.

[12]. H.N.M.E. Mahmud, A.B. Kassim, Z. Zainal, W.M. Mat Yunus (2005). Electronic Conducting Polymer Composite Films with Enhanced Mechanical Properties. ScienceAsia. 31, 313-317.

[13]. P. Chandrasekhar and K. Naishadham (1999). Broadband microwave absorption and shielding properties of a poly (aniline). Synth. Met. 105, 115-120.