000			01429nam a2200145Ia 4500
008			220216s9999 xx 000 0 und d
100			_aFukushima Yuichi
245		0	_aSynthesis of graft copolymers from highly deproteinised natural rubber
260			_bJournal of Rubber Research _c1998
300			_a154-166
520			_aHighly 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 centrigugation 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 trtbutyl hydroperoxie/tetraethylenepentamine (TBHPO-TEPA) as an organic redoex initiator.The styrene content, grafting efficiency and molecular weight of grafted polystyrene were significantly increased by deproteinisation. The number of grafting sites for 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.
700			_aKawahara Seiichi
700			_aTanaka Yasuyuki
942			_cJS
999			_c70149 _d70149