一种疏水缔合聚合物的合成及溶液性能

Synthesis and Solution Properties of A Hydrophobically Association Polymer

摘要:

通过官能团设计，合成出具有一定表面活性的长链季铵盐疏水单体——十八烷基-二甲基甲代烯丙基氯化铵（C18DMMAAC），用1H-NMR对其结构进行了表征。C18DMMAAC与丙烯酸（AA）、丙烯酰胺（AM）在水溶液中通过自由基聚合得到疏水缔合聚合物HAPAM-18，最佳的聚合反应条件为：n(AM):n(AA):n(C18DMMAAC)=74.94:25:0.06，AA的中和度为95%，单体总质量分数为20wt%，引发剂浓度为单体质量的0.05wt%，温度45℃，反应时间12h。研究表明，聚合物溶液的临界缔合浓度为2000mg/L；聚合物溶液对温度较为敏感，80℃时粘度保留率为70.93%；聚合物溶液仍为剪切变稀的假塑性流体，但表现出良好的抗剪切性能，剪切1h后粘度保留率达115%；由于设计为含较多阴离子的聚合物，该聚合物的抗盐性较差。

Abstract:

Through the design of the functional group, a long-chain quaternary ammonium salts of hydrophobic monomer—C18DMMAAC was synthesized. The structure of C18DMMAAC is charactered by 1H-NMR . Hydrophobically associating copolymer HAPAM-18 was synthesized by copolymerization of C18DMMAAC and acrylic acid (AA), acrylamide (AM) in aqueous solution by free radical copolymerization . HAPAM-18 solution have a higher value of apparent viscosity under the condition of n (AM): n (AA): n (C18DMMAAC ) = 74.94:25:0.06 , AA neutralized to 95% by NaOH, monomer concentration 20wt%, initiator concentration 0.05 wt% of the monomer mass, temperature 45 ℃, and reaction time 12h. The study showed that the critical associating concentration of the copolymer solution is 2000mg / L; the polymer solution is sensitive to temperature, and the viscosity reserved rate is to 70.93% at 80 ℃; the polymer solution is pseudoplastic fluid ,but it performs shear tolerance, and viscosity reserved rate is 115% under shear rate sustaining 1 hour. Since HAPAM-18 contains lots of anionic function groups, the salt resistance of the polymer is poor.