对丙烯酰胺(AM)和甲基丙烯酰氧乙基三甲基氯化铵(DMC)的水溶液聚合进行了研究与分析,采用复配引发体系,成功聚合出了阳离子型聚丙烯酰胺P(DMC-AM)。在成功聚合出所需的聚合物后,分析研究了不同工艺条件对聚合反应的影响;并通过红外光谱...对丙烯酰胺(AM)和甲基丙烯酰氧乙基三甲基氯化铵(DMC)的水溶液聚合进行了研究与分析,采用复配引发体系,成功聚合出了阳离子型聚丙烯酰胺P(DMC-AM)。在成功聚合出所需的聚合物后,分析研究了不同工艺条件对聚合反应的影响;并通过红外光谱和核磁对聚合物的结构进行了确认。得到较好的工艺参数是:在偶氮化合物和氧化还原剂组合的复合体系作用下,阳离子单体量为16%,偶氮引发剂量为0.013%,氧化还原剂用量是0.015%,EDTA 2Na质量分数0.1%,尿素质量分数0.1%,得到特性粘度为10.59 d L/g,溶解时间为20 min。展开更多
以丙烯酰胺(AM)、2-丙烯酰胺-2-甲基丙磺酸(AMPS)、甲基丙烯酸N,N-二甲基氨基乙酯(DMAEMA)为单体,采用氧化还原-水溶性偶氮复合引发体系制备AM/AMPS/DMAEMA三元磺化共聚物。利用FT-IR与核磁氢谱(1 H NMR)对共聚物进行结构表征,进行耐温...以丙烯酰胺(AM)、2-丙烯酰胺-2-甲基丙磺酸(AMPS)、甲基丙烯酸N,N-二甲基氨基乙酯(DMAEMA)为单体,采用氧化还原-水溶性偶氮复合引发体系制备AM/AMPS/DMAEMA三元磺化共聚物。利用FT-IR与核磁氢谱(1 H NMR)对共聚物进行结构表征,进行耐温抗盐性能、抗老化性能、溶解性能与抗剪切性能评价。结果表明:AMPS、DMAEMA的引入能显著改善丙烯酰胺类聚合物的耐温抗盐性能,合成的三元磺化共聚物在80℃、矿化度2%(质量分数)的盐溶液下放置90d后,其溶液的表观黏度仍能达到11.9mPa·s,相同条件下工业用部分水解聚丙烯酰胺(3 500万)溶液表观黏度仅为0.9mPa·s,表现出更好的抗老化性。展开更多
The diphenyliodonium salt (DPIOC)/triethylamine (TEA) is used as photoinitiator for radical photopolymerization. It was found that a ground state CT complex formed between DPIOC as electron acceptor and TEA as electro...The diphenyliodonium salt (DPIOC)/triethylamine (TEA) is used as photoinitiator for radical photopolymerization. It was found that a ground state CT complex formed between DPIOC as electron acceptor and TEA as electron donor, which results in extending the photosensitivity range of DPIOC/TEA system up to above 500nm compared with DPIOC alone. The kinetic studies on photopolymerization of methyl methacrylate (MMA) were carried out in CH_3CN: H_2O (14: 1, v/v) mixture solution at 30℃ by dilatometer. The results obtained show that the polymerization rate (R_p) increases with increasing concentrations of DPIOC and TEA with exponent 0. 65 and 0. 62 respectively. The activation energy E_a and k_p/k_^(1/2) value were determined to be 4.1 Kcal mol^(-1) and 0.045 respectively. The other influence factors and reaction mechanism were also discussed.展开更多
文摘对丙烯酰胺(AM)和甲基丙烯酰氧乙基三甲基氯化铵(DMC)的水溶液聚合进行了研究与分析,采用复配引发体系,成功聚合出了阳离子型聚丙烯酰胺P(DMC-AM)。在成功聚合出所需的聚合物后,分析研究了不同工艺条件对聚合反应的影响;并通过红外光谱和核磁对聚合物的结构进行了确认。得到较好的工艺参数是:在偶氮化合物和氧化还原剂组合的复合体系作用下,阳离子单体量为16%,偶氮引发剂量为0.013%,氧化还原剂用量是0.015%,EDTA 2Na质量分数0.1%,尿素质量分数0.1%,得到特性粘度为10.59 d L/g,溶解时间为20 min。
文摘以丙烯酰胺(AM)、2-丙烯酰胺-2-甲基丙磺酸(AMPS)、甲基丙烯酸N,N-二甲基氨基乙酯(DMAEMA)为单体,采用氧化还原-水溶性偶氮复合引发体系制备AM/AMPS/DMAEMA三元磺化共聚物。利用FT-IR与核磁氢谱(1 H NMR)对共聚物进行结构表征,进行耐温抗盐性能、抗老化性能、溶解性能与抗剪切性能评价。结果表明:AMPS、DMAEMA的引入能显著改善丙烯酰胺类聚合物的耐温抗盐性能,合成的三元磺化共聚物在80℃、矿化度2%(质量分数)的盐溶液下放置90d后,其溶液的表观黏度仍能达到11.9mPa·s,相同条件下工业用部分水解聚丙烯酰胺(3 500万)溶液表观黏度仅为0.9mPa·s,表现出更好的抗老化性。
文摘The diphenyliodonium salt (DPIOC)/triethylamine (TEA) is used as photoinitiator for radical photopolymerization. It was found that a ground state CT complex formed between DPIOC as electron acceptor and TEA as electron donor, which results in extending the photosensitivity range of DPIOC/TEA system up to above 500nm compared with DPIOC alone. The kinetic studies on photopolymerization of methyl methacrylate (MMA) were carried out in CH_3CN: H_2O (14: 1, v/v) mixture solution at 30℃ by dilatometer. The results obtained show that the polymerization rate (R_p) increases with increasing concentrations of DPIOC and TEA with exponent 0. 65 and 0. 62 respectively. The activation energy E_a and k_p/k_^(1/2) value were determined to be 4.1 Kcal mol^(-1) and 0.045 respectively. The other influence factors and reaction mechanism were also discussed.
