Dielectric properties of natural rubber latex at frequencies from 200 MHz to 2500 MHz

Kaida Khalid, . and Wan Mohamad Daud, . Dielectric properties of natural rubber latex at frequencies from 200 MHz to 2500 MHz. pp. 281-289. ISSN 0127-7065

Experimental results for dielectric properties of natural rubber latex at 26C over a frequency range of 200 MHz to 2500 MHz are presented. The study includes the variation of dielectric constant and dielectric loss factor with moisture content ranging from 40 to 100 (wet basis). A series of solution with various moisture contents were prepared from latex concentrate diluted latex concentrate freshly tapped latex and diluted fresh latex. Measurement of the dielectric properties was done by using open-ended co-axial line sensor and automated network analyser. Interesting results such as transition in the form of dielectric loss from conductive mechanism possibly due to interfacial polarisation to dipole orientation of water molecules at about 2 GHz were observed. A substantial conduction effect due to ammonia solution and conducting phases in the latex was also observed in the lower frequency region of the spectrum. However the dielectric constant parameter showed a good relationship with moisture content and the effect of conducting phases and preservative is not detectable i.e. independent of the type of solutions. A suggestion for future design of moisture content sensor for Hevea latex in this range of frequency is indicated.

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Abstract

Experimental results for dielectric properties of natural rubber latex at 26C over a frequency range of 200 MHz to 2500 MHz are presented. The study includes the variation of dielectric constant and dielectric loss factor with moisture content ranging from 40 to 100 (wet basis). A series of solution with various moisture contents were prepared from latex concentrate diluted latex concentrate freshly tapped latex and diluted fresh latex. Measurement of the dielectric properties was done by using open-ended co-axial line sensor and automated network analyser. Interesting results such as transition in the form of dielectric loss from conductive mechanism possibly due to interfacial polarisation to dipole orientation of water molecules at about 2 GHz were observed. A substantial conduction effect due to ammonia solution and conducting phases in the latex was also observed in the lower frequency region of the spectrum. However the dielectric constant parameter showed a good relationship with moisture content and the effect of conducting phases and preservative is not detectable i.e. independent of the type of solutions. A suggestion for future design of moisture content sensor for Hevea latex in this range of frequency is indicated.

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Item Type:	Article
AGROVOC Term:	Natural rubber
AGROVOC Term:	Hevea rubber
AGROVOC Term:	Latex
AGROVOC Term:	Electrical conductivity
AGROVOC Term:	Dielectric properties
AGROVOC Term:	Distribution of frequency
AGROVOC Term:	Dielectric constant
AGROVOC Term:	Moisture content
AGROVOC Term:	Polarization
Geographical Term:	Malaysia
Depositing User:	Ms. Suzila Mohamad Kasim
Last Modified:	28 Apr 2025 04:33
URI:	http://webagris.upm.edu.my/id/eprint/23464

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