Synthesis of graft copolymers from highly deproteinised natural rubber

Fukushima Yuichi, . and Kawahara Seiichi, . and Tanaka Yasuyuki, . Synthesis of graft copolymers from highly deproteinised natural rubber. pp. 154-166. ISSN 1511-1768

Highly deproteinised natural rubber (HDPNR) latex was prepared by incubation of commercial high-ammonia latex with a proteolytic enzyme in the presence of a surfactant followed by repeated centrifugation for two times. The nitrogen content of HDPNR was less than 0.02 suggesting the nearly complete removal of protein from the rubber. A graft copolymer of natural rubber with styrene was made from HDPNR latex using tert-butyl 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 with a proteolytic enzyme in the presence of a surfactant followed by repeated centrifugation for two times. The nitrogen content of HDPNR was less than 0.02 suggesting the nearly complete removal of protein from the rubber. A graft copolymer of natural rubber with styrene was made from HDPNR latex using tert-butyl 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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Item Type:	Article
AGROVOC Term:	Natural rubber
AGROVOC Term:	Latex
AGROVOC Term:	Polymers
AGROVOC Term:	Protein synthesis
AGROVOC Term:	Centrifugation
AGROVOC Term:	Polymerization
AGROVOC Term:	Ozonization
AGROVOC Term:	Nitrogen content
AGROVOC Term:	Polystyrene
AGROVOC Term:	Grafting
Depositing User:	Ms. Suzila Mohamad Kasim
Last Modified:	24 Apr 2025 06:28
URI:	http://webagris.upm.edu.my/id/eprint/23321

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