抗盐丙烯酰胺非线型共聚物的合成及溶液特性

实验室合成了长链大单体4-乙烯基辛烷基酚聚氧乙烯(14)醚(SMA)，并以丙烯酰胺(AM)为主要原料，引入单体SMA、4-乙烯基联苯(VB)和2-丙烯酰胺基-2-甲基丙磺酸(AMPS)，采用水溶液自由基胶束聚合法合成了抗盐丙烯酰胺非线型共聚物(PPSA)。采用核磁共振氢谱(¹H-NMR)和红外光谱(FT-IR)对PPSA进行了表征。考察了聚合物质量浓度、NaCl含量和温度对共聚物溶液表观黏度的影响。结果表明：PPSA在NaCl水溶液中显示出优异的盐增稠和热增稠效应；当PPSA质量浓度为2000 mg/L时，在53 ℃下质量分数为10%NaCl水溶液中表观黏度达到1210 mPa·s，显示了优异的增黏和抗盐性能；且在80 ℃下质量分数为10%NaCl水溶液中的表观黏度仍达到100.3 mPa·s，显示了良好的耐温性；扫描电镜(SEM)照片显示PPSA在高浓度NaCl水溶液中形成了超分子网络结构。

Synthesis and Solution Properties of Salt Resistant Acrylamide Non-Linear Copolymers

A long chain macromonomer allyl-capped octylphenoxy poly(ethylene oxide) (degree of polymerization 14) (SMA) was synthesized in the laboratory. The salt resistant acrylamide copolymers (PPSA) were synthesized by acrylamide (AM), SMA, 4-vinylbiphenyl (VB) and 2-acrylamido-2-methylpropanesulfonic acid (AMPS) with the micelle free radical copolymerization technique. Then, the synthesized copolymers were characterized with ¹H-NMR and FT-IR. Effects of polymer mass concentration, NaCl content and temperature on the apparent viscosity of copolymer solution were investigated. Experimental results indicate that the copolymers can exhibit good salt-thickening and heat-thickening properties. At the temperature of 53 ℃ and PPSA mass concentration of 2000 mg/L, the liquid apparent viscosity in mass fraction of 10%NaCl solution can be up to 1210 mPa·s. This indicates that the synthesized copolymers demonstrate excellent thickening and salt resistance properties. At the temperature of 80 ℃, liquid apparent viscosity with mass fraction of 10% NaCl solution is still 100.3 mPa·s, which suggest the copolymers have good heat resistance. Scanning electron microscope (SEM) results show that supramolecular network structure has been formed for PPSA in high concentration brine solution.