盐刺激响应疏水缔合聚合物溶液的流变性能

Salt stimulation responds to rheological properties of hydrophobic associating polymer solutions

摘要:

：以丙烯酰胺（AM）、十八烷基二甲基烯丙基氯化铵（ODAAC）和抗盐性非离子功能单体异构十烷聚氧乙烯醚丙烯酸酯（ECY）为原料，通过水溶液聚合反应合成了一种抗盐疏水缔合聚合物（HLMY）。通过黏度、荧光光谱、扫描电镜（SEM）和流变测试研究了HLMY在水溶液中的自组装缔合性能以及盐和温度对HLMY缔合行为的影响。结果表明，HLMY的临界缔合质量分数约为0.30%~0.35%。盐的加入增强了拟空间网络结构，同时，HLMY分子在NaCl溶液中比在CaCl2溶液中聚集得更紧密。在90、120和180 ℃，170 s-1下，将质量分数为0.6%HLMY溶液（以质量分数为5%NaCl盐溶液为溶剂）剪切时间小于500 s时，黏度随温度的升高而增加，说明HLMY在NaCl中具有优异的盐增稠能力，继续剪切2500 s时，黏度仍大于50 mPa·s。弹性模量（G′）随HLMY质量分数的增加而增大，体系的弹性增大，疏水结构单元数增加，形成密集的拟空间网络结构。

Abstract:

A novel salt-resistant hydrophobic polymer HLMY was synthesized from acrylamide (AM), octadecyldimethylpropyl ammonium chloride (ODAAC) and Salt-resistant Nonionic functional Iso-decane polyoxyethylene ether acrylate (ECY) by aqueous solution polymerization. The self-assembly association performance of HLMY in aqueous solution and the effects of salt and temperature on its association behavior were studied by viscosity, fluorescence, scanning electron microscopy (SEM) and rheological tests. The results showed that the critical association concentration of HLMY was about 0.30%~0.35%. The addition of salt enhanced the quasi-spatial network structure, and HLMY molecules clustered more closely in NaCl solution than in CaCl2 solution. When the shear time of 0.6%HLMY solution (5%NaCl solution as solvent) is less than 500 s at 90, 120 and 180℃, 170 s-1, the viscosity increases with the increase of temperature, indicating that HLMY has excellent salt thickening ability in NaCl. When the shear time continues for 2500 s, The viscosity is still greater than 50 mPa·s.. The elastic modulus(G') increases with the increase of HLMY mass fraction, the elasticity of the system increases, and the number of hydrophobic structural units increases, forming a dense quasi-spatial network structure.