一种疏水缔合聚合物的合成及溶液性能

将十八烷基-二甲基甲代烯丙基氯化铵(C18DMMAAC)作为疏水单体,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,通过1HNMR和红外光谱对其结构进行了表征。最佳的聚合反应条件为:n(AM)∶n(AA)∶n(C18DMMAAC)=74.94∶25∶0.06,AA的摩尔中和度为95%,单体总质量分数为20%,引发剂质量分数为0.05%(以单体总质量计),温度45℃,反应时间12 h。研究表明,聚合物溶液的临界缔合质量浓度为2 g/L;聚合物溶液对温度较为敏感,80℃时黏度保留率为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1 h后黏度保留率达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。

Synthesis and Solution Properties of A Hydrophobically Association Polymer

Hydrophobic associated copolymer HAPAM-18 was synthesized by copolymerization of hydrophobic monomer(C18DMMAAC) with acrylic acid(AA) and acrylamide(AM) in aqueous solution by free radical copolymerization.The structure of HAPAM-18 is characterized by means of 1HNMR and infrared spectrum.HAPAM-18 solution has a higher value of apparent viscosity under the conditions of n(AM)∶n(AA)∶n(C18DMMAAC)=74.94∶25∶0.06,AA neutralized to 95% by NaOH,monomer mass fraction 20%,initiator mass fraction 0.05% of the monomer mass,temperature 45 ℃,and reaction time 12 h.The study shows that the critical associating mass concentration of the copolymer solution is 2 g/L,the polymer solution is sensitive to temperature,and the viscosity reserved rate is 70.93% at 80 ℃.The polymer solution is pseudoplastic fluid,yet exhibiting excellent shear resistance,with the viscosity reserved rate being 115% after one hour of sustained shear rate.Since HAPAM-18 contains lots of anionic function groups,the salt resistance of the polymer is poor.