一种水溶性疏水缔合聚合物二临界缔合行为研究

Research on Two Critical Concentrations Behavior of a Hydrophobic Associating Copolymer

对三元共聚疏水缔合聚合物(丙烯酰胺/十八烷基二甲基烯丙基氯化铵/苯乙烯)的临界缔合浓度进行研究,发现其具有二临界缔合现象以及其在二临界缔合浓度附近不同的耐温抗盐的流变行为。研究结果表明,该疏水缔合聚合物的第一临界缔合浓度(C1*)为500mg/L,第二临界缔合浓度(C2*)为2400mg/L;C2*附近聚合物溶液的耐温性能较差;抗盐性能表现出三种不同的情况:随着盐质量浓度的增加,C<C1*时,溶液粘度下降;C1*<C<C2*时,溶液粘度先增加后下降;C>C2*时,溶液粘度先快速增加,后缓慢增加,最后下降。

This research finds that the hydrophobic associating water-soluble copolymer of poly-acylamide/ actodeci alkyl dimethyl allyl ammonium chloride/styrene has two critical concentrations at which there are different behavior of temperature resistance and salt tolerance. The first critical associating concentration （ C1^＊ ）is 500mg/L, the second critical associating concentration （ C2^＊ ） is 2400mg/L. When the concentration of solution polymer is near C2^＊ , the performance of temperature tolerance is low. With the concentration of salt increasing, the influence of salt behaves three different status： when C 〈 C1^＊ , the solution viscosity decreases; when C1^＊ 〈 C 〈 C2^＊ , the viscosity firstly increases, then decreases; when C 〉 C2^＊ , the viscosity firstly increases rapidly, then increases slowly, and decreases in the end.