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• Tangboriboon, N
• Uttanawanit, N
• Longtong, M
• Wongpinthong, P
• Sirivat, A
• Kunanuruksapong, R
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• Tangboriboon, N
• Uttanawanit, N
• Longtong, M
• Wongpinthong, P
• Sirivat, A
• Kunanuruksapong, R
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• Tangboriboon, N
• Uttanawanit, N
• Longtong, M
• Wongpinthong, P
• Sirivat, A
• Kunanuruksapong, R

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Materials 2010, 3(1), 656-671; doi:10.3390/ma3010656

Article

Electrical and Electrorheological Properties of Alumina/Natural Rubber (STR XL) Composites

Nuchnapa Tangboriboon ¹ , Nuttapot Uttanawanit ¹ , Mean Longtong ¹ , Piraya Wongpinthong ¹ , Anuvat Sirivat ^2,*  and Ruksapong Kunanuruksapong ²

¹ Department of Materials Engineering, Faculty of Engineering, Kasetsart University, Bangkok 10900, Thailand ² 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

(This article belongs to the Special Issue Composite Materials)

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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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