2003•天津大学学报：英文版Requires access
Starch Modification by Graft Copolymerization of Acrylonitdle
刘瑞贤, Li Li, 茹宗玲, 张黎明, 高建平, 田汝川
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Abstract
The graft copolymerization of acrylonitrile ( AN ) onto starch under the initiation of potassium perman-ganate was investigated. The effect of various reaction conditions on the graft copolymerization was studied. The relationships between the grafting rate and the initiator concentration of potassium permanganate, monomer acuylonitrile and backbone starch, as well as reaction temperature were established. The oxidation reaction of starch with manganic ions and valence changes of manganic ions during the graft copolymerization were discussed. The results show that manganic ion Mn^7+ underwent a series of valence changes during the graft copolymerization:Mn(Ⅶ) → Mn(Ⅳ)→ Mn(Ⅲ ) → Mn( Ⅱ ). The grafting rate of the graft copolymerization of acrylonitrile onto starch is also given.