兼具有强阴离子性与疏水缔合性的丙烯酰胺三元共聚物

STUDY ON TERCOPOLYMER OF ACRYLAMIDE CONTAINING STRONG ANIONS AND HYDROPHOBIC ASSOCIATION BLOCKS

在微乳液介质中实施了丙烯酰胺 (AM)、苯乙烯 (St)、2 丙烯酰胺基 2 甲基丙磺酸钠 (NaAMPS)的共聚合 ,制备了既含有强阴离子性基团 (—SO3Na)又含有疏水基团 (St)的丙烯酰胺三元共聚物AM NaAMPS St;通过红外光谱法、紫外分光光度法及元素分析法对共聚物的结构及组成进行了表征 ;稀释外推粘度法测定了共聚物的特性粘数 ;测定了共聚物纯水溶液及盐水溶液的表观粘度 ;荧光探针法考察了三元共聚物的疏水缔合性以及离子基团对疏水缔合性的影响规律 .实验结果表明 ,在聚丙烯酰胺 (PAM )分子主链上同时引入强阴离子性基团与疏水基团后 ,阴离子的电粘效应与疏水基团的疏水缔合作用相互协同 ,会使共聚物水溶液的黏度显著提高 ;盐溶液对疏水缔合作用的增强效应与强阴离子基团对盐的较大容忍度相互结合 ,会使共聚物水溶液的抗盐性能明显得以提高 ;大分子链上的强阴离子基团磺酸根的存在 ,在一定程度上会削弱疏水基团之间的疏水缔合作用 ,即对疏水基团的疏水缔合行为会产生一定的负性影响 .

The copolymerization of acrylamide (AM), sodium 2-acrylamido-2-methyl-propane-sulfonate (NaAMPS) and styrene(St) was carried in microemulsion madium, and tercopolymer AM/NaAMPS/St containing strong anionic group -SO3Na and hydrophobic association group St was synthesized. The structure and composition of the copolymer were characterized by FTIR spectrum, UV spectrum and element analysis. The solution viscosity of the copolymers was determined using an Ubbelohde viscometer, and the intrinsic viscosities by which molecular weight can be indicated relatively were determined with the method of dilute extensional method. The apparent viscosities of aqueous solutions and brine of the copolymers were measured using a low shear rotational viscometer. The hydrophobically associating property and influence of ionic groups on the hydrophobic association property were investigated. The experimental results are as follows. After incorporating strong anions and hydrophobic groups at the same time in the backbone of polyacrylamide, the viscosity of the copolymer aqueous solution will increase obviously under coordination of electric viscosity of ions and hydrophobic association property of hydrophobic group and the salt resistance of the copolymer will increase evidently under the combining of strengthening hydrophobic association by salt and greater tolerating salt of strong anions. The hydrophobic association property of hydrophobic association group St is weakened and the critical associating concentration of the copolymer is increased due to existing of strong anionic groups in macromolecular chains.