Abstract - Transition of Complex Permittivity Losses in Hevea Rubber Latex from Conductivity Losses to Dipolar Losses at 2.6 GHz


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	Publications of MRB Latest Publications MRB Digest Journal of Rubber Research 3^rd Qtr 2008 Vol 11(3) 2^nd Qtr 2008 Vol 11(2) 1^st Qtr 2008 Vol 11(1) 4^th Qtr 2007 Vol 10(4) 3^rd Qtr 2007 Vol 10(3) 2^nd Qtr 2007 Vol 10(2) 1^st Qtr 2007 Vol 10(1) 1^st Qtr 2006 Vol 9(1) 2^nd Qtr 2006 Vol 9(2) 3^rd Qtr 2006 Vol 9(3) 4^th Qtr 2006 Vol 9(4) Submit paper/article Order Form	Abstract Transition of Complex Permittivity Losses in Hevea Rubber Latex from Conductivity Losses to Dipolar Losses at 2.6 GHz J. Hassan, K. Khalid and W. M. D. Wan Yusoff Dielectric properties of Hevea rubber latex with moisture content 38%-98% were measured using the open-ended coaxial line sensor coupled to the Automated Network Analyser. Measurements were made at frequencies 0.2 GHz-20 GHz and at selected temperatures -30°C to 50°C. Complex permittivity losses or dielectric loss factor showed a very interesting phenomena at 0.2 GHz to 2.6 GHz where a transition occurred from conductivity losses to dipolar losses. Below 2.6 GHz, the losses were due to the conducting phases in the Hevea latex arising from proteins, fatty acid soaps, phospholipids and various types of ohmic species. Higher losses were achieved from latex concentrate due to the addition of ammonia as preservative. Above 2.6 GHz the losses were governed by orientation of the water molecules. The transition was clearly observed in the plots of dielectric losses versus temperature at 0.2, 0.6, 1.0, 1.4, 1.8, 2.2 and 2.6 GHz for latex concentrate, fresh latex, diluted fresh latex and deionised water at moisture contents 38%, 56% 89% and 100%, respectively. back
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