The effect of oleates as emulsifiers on graft copolymerization of starch with acrylamide (AM) and acrylic acid (AA) in the inverse emulsion system is studied in this paper .The effect of the kinds of emulsifiers, the ...The effect of oleates as emulsifiers on graft copolymerization of starch with acrylamide (AM) and acrylic acid (AA) in the inverse emulsion system is studied in this paper .The effect of the kinds of emulsifiers, the proportion of mixed emulsifiers, the dosage of emulsifiers as well as the preparation methods of water-in-oil emulsion on monomer conversion, grafting ratio, and specific viscidity is discussed. The result indicates that calcium oleate or magnesium oleate as the emulsifier is better than sodium oleate or potassium oleate, and the mixture of oleic acid and its salt is better than any single compound.It is also concluded that monomer conversion reaches 99.7% and grafting ratio reaches 98.4% when m(oleic acid)/m(oleate sodium) is 60/40,m(starch)/m(monomers) is 1/1(among the monomers m(AM)/m(AA) is 4/1),v(oil phase)/v(water phase) is 1.2/1, initiator concentration is 2.4×10 -4mol·L -1,reaction temperature is 45～50℃,and reaction time is 6 hours.When mixed emulsifers concentration is 6%, the intrinsic viscidity reaches 1100ml·g -1.展开更多
The optimum conditions of grafting copolymerization reaction of acrylic acid(AA) onto polypropylene(PP) fiber was studied by using benzoyl peroxide(BPO) as initiator.The primary and secondary sequences of the grafting...The optimum conditions of grafting copolymerization reaction of acrylic acid(AA) onto polypropylene(PP) fiber was studied by using benzoyl peroxide(BPO) as initiator.The primary and secondary sequences of the grafting copolymerization reaction conditions was analysed. The results showed that grafting copolymerization reaction was greatly influenced by the temperature,reaction time, concentration of BPO and that of AA in the primary and secondary role as the above sequence. The optimum reaction conditions of gaining higher exchange capacity for the weak acidic cation-exchange fiber are as follows: the grafting temperature 80 ℃, the reaction time 7 h, the concentration of BPO 2% and AA 80%.展开更多
文摘The effect of oleates as emulsifiers on graft copolymerization of starch with acrylamide (AM) and acrylic acid (AA) in the inverse emulsion system is studied in this paper .The effect of the kinds of emulsifiers, the proportion of mixed emulsifiers, the dosage of emulsifiers as well as the preparation methods of water-in-oil emulsion on monomer conversion, grafting ratio, and specific viscidity is discussed. The result indicates that calcium oleate or magnesium oleate as the emulsifier is better than sodium oleate or potassium oleate, and the mixture of oleic acid and its salt is better than any single compound.It is also concluded that monomer conversion reaches 99.7% and grafting ratio reaches 98.4% when m(oleic acid)/m(oleate sodium) is 60/40,m(starch)/m(monomers) is 1/1(among the monomers m(AM)/m(AA) is 4/1),v(oil phase)/v(water phase) is 1.2/1, initiator concentration is 2.4×10 -4mol·L -1,reaction temperature is 45～50℃,and reaction time is 6 hours.When mixed emulsifers concentration is 6%, the intrinsic viscidity reaches 1100ml·g -1.
文摘The optimum conditions of grafting copolymerization reaction of acrylic acid(AA) onto polypropylene(PP) fiber was studied by using benzoyl peroxide(BPO) as initiator.The primary and secondary sequences of the grafting copolymerization reaction conditions was analysed. The results showed that grafting copolymerization reaction was greatly influenced by the temperature,reaction time, concentration of BPO and that of AA in the primary and secondary role as the above sequence. The optimum reaction conditions of gaining higher exchange capacity for the weak acidic cation-exchange fiber are as follows: the grafting temperature 80 ℃, the reaction time 7 h, the concentration of BPO 2% and AA 80%.
