Soluble-protein-free radiation-vulcanised natural rubber latex


Citation

Ratnayake U., . and Makuuchi K., . and Yoshii F., . Soluble-protein-free radiation-vulcanised natural rubber latex. pp. 153-163. ISSN 1511-1768

Abstract

The effect of water-soluble polymers (WSPs) such as polyvinyl alcohol (PVA) and polyvinyl pyrolidone (PVP) on radiation-vulcanised natural rubber latex (RVNRL) was investigated. Extractable protein measurements showed that mixing of WSP into RVNRL followed by centrifugation effectively reduced the extractable protein from RVNRL. However extractable protein could be further effectively removed from RVNRL by adding low-molecular-weight PVA (LMW-PVA) and PVP (LMW-PVP). It was further observed that using 3 p.h.r. of either LMW-PVA or LMW-PVP followed by 20 min leaching in 1 ammonia solution was sufficient to produce RVNRL free of soluble proteins. Based on these results a new process has been developed by the incorporation of LMW-WSP into RVNRL and centrifugation followed by leaching. Tensile properties such as tensile and tear strength were comparable to those of conventional RVNL. Fourier Transform Infrared measurements showed that most of the WSP was removed from RVNRL during the centrifugation process. The viscosity of the RVNRL was not much affected by the addition of LMR-WSP.


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Abstract

The effect of water-soluble polymers (WSPs) such as polyvinyl alcohol (PVA) and polyvinyl pyrolidone (PVP) on radiation-vulcanised natural rubber latex (RVNRL) was investigated. Extractable protein measurements showed that mixing of WSP into RVNRL followed by centrifugation effectively reduced the extractable protein from RVNRL. However extractable protein could be further effectively removed from RVNRL by adding low-molecular-weight PVA (LMW-PVA) and PVP (LMW-PVP). It was further observed that using 3 p.h.r. of either LMW-PVA or LMW-PVP followed by 20 min leaching in 1 ammonia solution was sufficient to produce RVNRL free of soluble proteins. Based on these results a new process has been developed by the incorporation of LMW-WSP into RVNRL and centrifugation followed by leaching. Tensile properties such as tensile and tear strength were comparable to those of conventional RVNL. Fourier Transform Infrared measurements showed that most of the WSP was removed from RVNRL during the centrifugation process. The viscosity of the RVNRL was not much affected by the addition of LMR-WSP.

Additional Metadata

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Item Type: Article
AGROVOC Term: Natural rubber
AGROVOC Term: Radiation
AGROVOC Term: Polymers
AGROVOC Term: Solubility
AGROVOC Term: Latex
AGROVOC Term: Proteins
AGROVOC Term: Centrifugation
AGROVOC Term: Allergies
AGROVOC Term: Hydrocarbons
AGROVOC Term: Protein content
Geographical Term: Malaysia
Depositing User: Ms. Suzila Mohamad Kasim
Last Modified: 28 Apr 2025 03:24
URI: http://webagris.upm.edu.my/id/eprint/23196

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