A superabsorbent resin was prepared through free-radical polymerization in aqueous solution,which used konjac glucomannan(KGM),acrylic acid(AA)and acrylamide(AM)as raw materials.Graft polymerization was initiated by p...A superabsorbent resin was prepared through free-radical polymerization in aqueous solution,which used konjac glucomannan(KGM),acrylic acid(AA)and acrylamide(AM)as raw materials.Graft polymerization was initiated by potassium persulfate(K2S2O8),with N,N′-methylene-bis-acrylamide(NMBA)was used as crosslinking agent .The relationships between the water absorption of the resin and the amounts of initiator,crosslinker,AA and AM as well as reaction temperature,reaction time were studied.This superabsorbent polymer was capable of absorbing distilled water up to 720 times and 0.9%NaCl solution 110 times in its saturated state at ambient temperature when the mass ratio of KGM to monomer was 1∶4,the amount of initiator was 0.35%(based on the weight of monomer),the neutralization degree of monomer was 80 %,the reaction temperature was 55～65℃,and the amount of crosslinker was 0.075%(based on the weight of monomer).Experimental results indicated that the introduction of nonionic group would be suitable for improving absorption ability and salt-resistance of the resulting hydrogels.展开更多
以磷钨酸和十六烷基三甲基溴化铵(CTAB)合成的磷钨杂多酸季铵盐为催化剂,以大豆油为原料、30%双氧水为氧源,在无羧酸条件下催化合成了环氧化大豆油,探讨了催化剂用量、双氧水用量、反应温度及时间对环氧化反应的影响。结果表明:采用0.3 ...以磷钨酸和十六烷基三甲基溴化铵(CTAB)合成的磷钨杂多酸季铵盐为催化剂,以大豆油为原料、30%双氧水为氧源,在无羧酸条件下催化合成了环氧化大豆油,探讨了催化剂用量、双氧水用量、反应温度及时间对环氧化反应的影响。结果表明:采用0.3 g自制催化剂,7.5 m L 30%双氧水,在45℃下反应100 min时,环氧值可达6%。展开更多
文摘A superabsorbent resin was prepared through free-radical polymerization in aqueous solution,which used konjac glucomannan(KGM),acrylic acid(AA)and acrylamide(AM)as raw materials.Graft polymerization was initiated by potassium persulfate(K2S2O8),with N,N′-methylene-bis-acrylamide(NMBA)was used as crosslinking agent .The relationships between the water absorption of the resin and the amounts of initiator,crosslinker,AA and AM as well as reaction temperature,reaction time were studied.This superabsorbent polymer was capable of absorbing distilled water up to 720 times and 0.9%NaCl solution 110 times in its saturated state at ambient temperature when the mass ratio of KGM to monomer was 1∶4,the amount of initiator was 0.35%(based on the weight of monomer),the neutralization degree of monomer was 80 %,the reaction temperature was 55～65℃,and the amount of crosslinker was 0.075%(based on the weight of monomer).Experimental results indicated that the introduction of nonionic group would be suitable for improving absorption ability and salt-resistance of the resulting hydrogels.
文摘以磷钨酸和十六烷基三甲基溴化铵(CTAB)合成的磷钨杂多酸季铵盐为催化剂,以大豆油为原料、30%双氧水为氧源,在无羧酸条件下催化合成了环氧化大豆油,探讨了催化剂用量、双氧水用量、反应温度及时间对环氧化反应的影响。结果表明:采用0.3 g自制催化剂,7.5 m L 30%双氧水,在45℃下反应100 min时,环氧值可达6%。
