Citation
Fukushima Yuichi, . and Kawahara Seiichi, . and Tanaka Yasuyuki, . Synthesis of graft copolymers from highly deproteinised natural rubber. pp. 154-166. ISSN 1511-1768
Abstract
Highly deproteinised natural rubber (HDPNR) latex was prepared by incubation of commercial high-ammonia latex a proteolytic enzyme in the presence of surfactant followed by repeated centrifugation for two times. The nitrogen content of HDPNR was less than 0.02 percent suggesting the nearly complete removal of protein from the rubber. A graft copolymer of natural rubber with styrene was made from HDPNR latex using tertbutyl hydroperoxide/tetraethylenepentamine (TBHPO-TEPA) as an organic redox initiator. The styrene content grafting efficiency and molecular weight of grafted polystyrene were significantly increased by deproteinisation. The number of grafting sites for graft copolymer from HDPNR latex was about three times larger than that determined for graft copolymer from untreated natural rubber latex. The difference between the behaviour of HDPNR and untreated natural rubber was due to the removal of protein and of naturally occurring antioxidants present in untreated natural rubber latex.
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Abstract
Highly deproteinised natural rubber (HDPNR) latex was prepared by incubation of commercial high-ammonia latex a proteolytic enzyme in the presence of surfactant followed by repeated centrifugation for two times. The nitrogen content of HDPNR was less than 0.02 percent suggesting the nearly complete removal of protein from the rubber. A graft copolymer of natural rubber with styrene was made from HDPNR latex using tertbutyl hydroperoxide/tetraethylenepentamine (TBHPO-TEPA) as an organic redox initiator. The styrene content grafting efficiency and molecular weight of grafted polystyrene were significantly increased by deproteinisation. The number of grafting sites for graft copolymer from HDPNR latex was about three times larger than that determined for graft copolymer from untreated natural rubber latex. The difference between the behaviour of HDPNR and untreated natural rubber was due to the removal of protein and of naturally occurring antioxidants present in untreated natural rubber latex.
Additional Metadata
| Item Type: | Article |
|---|---|
| Additional Information: | Summary (En) |
| AGROVOC Term: | RUBBER |
| AGROVOC Term: | LATEX |
| AGROVOC Term: | PROTEINS |
| AGROVOC Term: | PROTEIN SYNTHESIS |
| AGROVOC Term: | ENZYMES |
| AGROVOC Term: | POLYMERS |
| AGROVOC Term: | AROMATIC HYDROCARBONS |
| AGROVOC Term: | POLYSTYRENE CAUCHO |
| AGROVOC Term: | LATEX |
| AGROVOC Term: | PROTEINAS |
| Depositing User: | Ms. Norfaezah Khomsan |
| Last Modified: | 24 Apr 2025 05:52 |
| URI: | http://webagris.upm.edu.my/id/eprint/17688 |
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