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机构地区:[1]大连理工大学精细化工国家重点实验室 [2]大连轻工业学院化工系,辽宁大连116034 [3]大连轻工业学院化工系
出 处:《化工学报》2004年第2期325-327,共3页CIESC Journal
摘 要: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.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 are 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 are 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 2.4×10-4 mol·L-1, reaction temperature is 45-50°C, and reaction time is 6 hours. When mixed emulsifers concentration is 6%, the intrinsic viscidity reaches 1100 mi·g-1.
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