反相微小乳液合成速溶高分子量聚丙烯酸钠

以聚异丁烯丁二酰亚胺、十二烷基硫酸钠为乳化剂,采用反相微小乳液法合成了速溶高分子量聚丙烯酸钠.研究了乳化剂和pH值对聚合体系稳定性的影响以及(NH4)2S2O8—甲基丙烯酸—N、N—二甲氨基乙酯(DMAEMA)—NaHSO3引发剂、单体浓度、烯丙醇对聚合物性能的影响.结果表明,最佳的实验条件:pH值等于10;乳化剂用量为5%(油相);引发剂浓度分别为0.06%、0.04%、0.02%(W单体);烯丙醇的浓度为0.08%(W单体);单体浓度为40%(水相).在最佳实验条件下,合成聚合物分子量超过2×107,且溶解性能优于溶液聚合和反相悬浮聚合所得产品.

Synthesis of Quick Dissolving High Molecular Weight Polyacrylate Sodium by Reverse Microlatex

Synthesized quick dissolving high molecular weight polyacrylate sodium by reverse microlatex with polyisobutylene succimide and sodium dodecyl sulfate as emulsifying agent. The effect of emulsifying agent and pH on the stability of the polymeric system was investigated. The effect of (NH_4)_2S_2O_8-DMAEMA-NaHSO_3 initiator and concentration of monomer and allyl alcohol on the performance of the products was also investigated. It is shown that the optimal experimental conditions are pH, 10; emulsifying agent use level, 5%(oil system); initiator concentration, 0.06%, 0.04%, 0.02%(monomer weight);allyl alcohol concentration,0.08%(monomer weight); monomer concentration, 40%(water system), respectively. The molecular weight of the synthesized product at the optimal experimental conditions is greater than 2×10~7. The solubility of the product is better than that synthesized by reverse suspension and solution polymerization.