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以N-(3-二甲氨基丙基)甲基丙烯酰胺(DMAPMA)和丙烯酰胺(AM)为单体,以过硫酸铵和亚硫酸氢钠为引发剂进行自由基聚合,合成了一种CO_2/N_2开关响应型聚合物P(DMAPMA-AM)。通过单因素实验得出最佳合成条件为:n(AM)∶n(DMAPMA)=4∶1、单体总质量分数为25%、n[(NH_4)_2S_2O_8]∶n(NaHSO_3)=2∶3、引发剂加入量为单体总质量的0.2%、反应温度40℃、反应时间4 h。用FTIR、1HNMR对产物进行了结构表征,测量了质量分数为0.2%的聚合物水溶液在通入CO_2/N2前后的电导率、Zeta电位和平均粒径,并对其乳化性能进行了考察。结果表明:在通入CO_2后,溶液的电导率由12.6μs/cm上升到40.7μs/cm,Zeta电位由1.25 m V上升到10.11 m V,平均粒径由708.6 nm降低到137.1 nm,而向溶液改通N2后溶液的电导率降到14.2μs/cm,Zeta电位下降到1.96 m V,平均粒径上升到589.8 nm,表明P(DMAPMA-AM)具有可逆的CO_2/N2开关响应性能。扫描电镜测试发现,通入CO_2/N_2前后聚合物线团的尺寸以及疏水颗粒的数目发生了显著变化。CO_2/N2能将聚合产物存在的油水混合体系进行有效的破乳/乳化。
A series of free radical polymerization of N- (3-dimethylaminopropyl) methacrylamide (DMAPMA) and acrylamide (AM) with ammonium persulfate and sodium bisulfite as initiator CO_2 / N_2 switch responsive polymer P (DMAPMA-AM). The optimum synthesis conditions were as follows: n (AM): n (DMAPMA) = 4:1, the total mass fraction of monomer was 25%, n [(NH 4) 2 S 2 O 8] 3, the amount of initiator added 0.2% of the total mass of the monomer, the reaction temperature is 40 ℃, the reaction time 4 h. The structure of the product was characterized by FTIR and 1HNMR. The conductivity, Zeta potential and average particle size of the polymer aqueous solution with 0.2% mass fraction before and after CO 2 / N 2 pass were measured. The emulsifying properties were also investigated. The results showed that the conductivity of the solution increased from 12.6μs / cm to 40.7μs / cm after the introduction of CO_2, the zeta potential increased from 1.25 mV to 10.11 mV, and the average particle size decreased from 708.6 nm to 137.1 nm. The conductivity decreased to 14.2μs / cm and the Zeta potential decreased to 1.96 mV and the average particle size increased to 589.8 nm after the solution was turned on N2, indicating that P (DMAPMA-AM) possesses reversible CO_2 / N2 switching response. Scanning electron microscopy results showed that the size of the polymer coil and the number of hydrophobic particles changed significantly before and after CO 2 / N 2 introduction. CO_2 / N2 can effectively demulsify / emulsify the oil-water mixing system in which the polymerization product is present.