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Electrical and Electrorheological Properties of Alumina/Natural Rubber (STR XL) Composites
Department of Materials Engineering, Faculty of Engineering, Kasetsart University, Bangkok 10900, Thailand
The Petroleum and Petrochemical College, Chulalongkorn University, Bangkok 10330, Thailand
* Author to whom correspondence should be addressed.
Received: 18 December 2009; in revised form: 19 January 2010 / Accepted: 21 January 2010 / Published: 22 January 2010
Abstract: The electrorheological properties (ER) of natural rubber (XL)/alumina (Al2O3) composites were investigated in oscillatory shear mode under DC electrical field strengths between 0 to 2 kV/mm. SEM micrographs indicate a mean particle size of 9.873 ± 0.034 µm and particles that are moderately dispersed in the matrix. The XRD patterns indicate Al2O3 is of the β-phase polytype which possesses high ionic conductivity. The storage modulus (G′) of the composites, or the rigidity, increases by nearly two orders of magnitude, with variations in particle volume fraction and electrical field strength. The increase in the storage modulus is caused the ionic polarization of the alumina particles and the induced dipole moments set up in the natural rubber matrix.
Keywords: natural rubber; dielectric elastomer; alumina
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Tangboriboon, N.; Uttanawanit, N.; Longtong, M.; Wongpinthong, P.; Sirivat, A.; Kunanuruksapong, R. Electrical and Electrorheological Properties of Alumina/Natural Rubber (STR XL) Composites. Materials 2010, 3, 656-671.
Tangboriboon N, Uttanawanit N, Longtong M, Wongpinthong P, Sirivat A, Kunanuruksapong R. Electrical and Electrorheological Properties of Alumina/Natural Rubber (STR XL) Composites. Materials. 2010; 3(1):656-671.
Tangboriboon, Nuchnapa; Uttanawanit, Nuttapot; Longtong, Mean; Wongpinthong, Piraya; Sirivat, Anuvat; Kunanuruksapong, Ruksapong. 2010. "Electrical and Electrorheological Properties of Alumina/Natural Rubber (STR XL) Composites." Materials 3, no. 1: 656-671.