Quick determination of dry rubber content in natural rubber latex by low-resolution pulsed NMR technique

Gambhir P.N., . and Joshi D.K., . and Tiwari P.N., . and Mani J., . Quick determination of dry rubber content in natural rubber latex by low-resolution pulsed NMR technique. pp. 208-212. ISSN 0127-7065

Proton Nuclear Magnetic Resonance technique using a spin-echo sequence has been used for quick determination of dry rubber content (DRC) of natural rubber latex. The measurement is based on the fact that the relaxation rates of solid and aqueous phases of the latex are markedly different. The combined signal of the two phases is obtained by sampling the free induction decay (FID) following a 90 pulse (immediately after the dead time of the receiver) in a spin-echo sequence. The echo signal representing the aqueous phase is measured when the solid phase signal has decayed the negligible value. Using these two signal values and correction factor to account for the difference in hydrogen content in the solid and liquid phases DRC of twenty amminiated latex samples were determined. The DRC values obtained by this method are in good agreement with those obtained by the standard laboratory method (R20.991 P0.001). The study shows the feasibility of a quick and precise NMR method of DRC determination without requiring any preparation or weighing of sample or a calibration curve

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Abstract

Proton Nuclear Magnetic Resonance technique using a spin-echo sequence has been used for quick determination of dry rubber content (DRC) of natural rubber latex. The measurement is based on the fact that the relaxation rates of solid and aqueous phases of the latex are markedly different. The combined signal of the two phases is obtained by sampling the free induction decay (FID) following a 90 pulse (immediately after the dead time of the receiver) in a spin-echo sequence. The echo signal representing the aqueous phase is measured when the solid phase signal has decayed the negligible value. Using these two signal values and correction factor to account for the difference in hydrogen content in the solid and liquid phases DRC of twenty amminiated latex samples were determined. The DRC values obtained by this method are in good agreement with those obtained by the standard laboratory method (R20.991 P0.001). The study shows the feasibility of a quick and precise NMR method of DRC determination without requiring any preparation or weighing of sample or a calibration curve

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Item Type:	Article
Additional Information:	Summary (En)
AGROVOC Term:	LATEX
AGROVOC Term:	CONTENIDO DE MATERIA SECA
AGROVOC Term:	ESPECTROSCOPIA RMN
AGROVOC Term:	MEDICION
AGROVOC Term:	METODOS
AGROVOC Term:	EXPERIMENTACION EN LABORATORIO
Depositing User:	Ms. Norfaezah Khomsan
Last Modified:	24 Apr 2025 05:56
URI:	http://webagris.upm.edu.my/id/eprint/20694

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