摘要
分别采用常规实验评价和分子动力学模拟方法,研究了丙烯酰胺/丙烯酸钠/2-丙烯酰胺基-2-甲基-丙磺酸钠共聚物(P(AM/AANa/AMPSNa))和部分水解聚丙烯酰胺(HPAM)在不同类型阳离子存在下的溶液性质,并从原子分子水平探讨了P(AM/AANa/AMPSNa)的耐盐机理。实验结果表明,在相同浓度下,不同阳离子对P(AM/AANa/AMPSNa)黏度影响能力的大小顺序为:Ca2+>Mg2+>Na+。与HPAM分子相比,在P(AM/AANa/AMPSNa)分子链上一定量的磺酸基增强了分子链内带负电基团的静电排斥作用,且对阳离子吸引弱,有效增加了分子链流体力学体积;强极性的磺酸基使水化层更致密,溶液中阳离子在穿透水化层时需克服更大的能量势垒,导致阳离子对带负电基团的静电屏蔽作用较弱,使P(AM/AANa/AMPSNa)更耐盐。
The solution properties of acrylamide/sodium acrylate/2-acrylamido-2-methylpropanesulfonic acid sodium copolymer(P(AM/AANa/AMPSNa))and partially hydrolyzed polyacrylamide(HPAM)in the presence of different types of cations were examined by conventional experimental evaluation and molecular dynamics simulation.Moreover,the salt tolerance mechanism of P(AM/AANa/AMPSNa)was discussed at the atom-molecule level.The results show that the ability of different cations to influence the viscosity of P(AM/AANa/AMPSNa)at the same concentration is in the order of Ca2+>Mg2+>Na+.Compared with HPAM,a certain amount of sulfonic acid group on the P(AM/AANa/AMPSNa)molecular chain can enhance the electrostatic repulsion of the negatively charged group in the molecular chain,and manifest weak attraction of cations,which effectively increases the hydrodynamic volume of the molecular chain.The polar sulfonic acid group of strong polarity makes the hydration layer even more denser,and the cations in the solution are required to overcome a larger energy barrier when penetrating the hydration layer,resulting in a weak electrostatic shielding effect of the cation on the negatively charged group,and making P(AM/AANa/AMPSNa)more salt tolerance.
作者
胡晓娜
伊卓
刘希
李雅婧
张瑞琪
杨金彪
HU Xiaona;YI Zhuo;LIU Xi;LI Yajing;ZHANG Ruiqi;YANG Jinbiao(Sinopec(Beijing)Research Institute of Chemical Industry Co.,Ltd.,Beijing 100013,China)
出处
《石油化工》
CAS
CSCD
北大核心
2024年第6期855-861,共7页
Petrochemical Technology
基金
中国石油化工股份有限公司资助项目(420055-3)。
关键词
丙烯酰胺共聚物
耐盐性
分子动力学模拟
黏度
acrylamide copolymer
salt tolerance
molecular dynamic simulation
viscosity
