标题：Study about how the metal cationic ions affect the properties of partially hydrolyzed hydrophobically modified polyacrylamide (HMHPAM) in aqueous solution
作者：Yuan, Rui; Li, Ying; Li, Chunxiu; Fang, Hongbo; Wang, Wei
作者机构：[Yuan, Rui; Li, Ying; Li, Chunxiu] Shandong Univ, Key Lab Colloid & Interface Chem, State Educ Minist, Jinan, Shandong, Peoples R China.; [Fang, Hon 更多
通讯作者地址：[Li, Y]Shandong Univ, Sch Chem & Chem Engn, 27 Shanda Nanlu, Jinan 250100, Shandong, Peoples R China.
来源：COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
关键词：Molecular dynamics simulations; Hofmeister effect; Cationic ions;; Partially hydrolyzed hydrophobically modified polyacrylamide; Hydration
摘要：How the inorganic cations (Na+, Mg2+, Ca2+, Cr3+ and Fe3+) affect the properties of partially hydrolyzed hydrophobically modified polyacrylamide (HMHPAM) in aqueous solution was studied via molecular dynamics simulations, transmission electron microscopy, dynamic light scattering, Fourier transformation infrared spectroscopy, viscometer and conductivity measurements. The hydration and dehydration states of cations and the interaction force of the hydrated cations to the charged groups of polymer have been investigated by MD, which provided a fresh look into the interactions between cationic ions and HMHPAM. It was found that the water absorbing ability of cations was not always central to the degree of the effect on properties of HMHPAM. The coordination interaction and Coulomb interaction between multivalent cations and HMHPAM were found to be overwhelmingly important which accommodate remarkable effect on the property of the polymers in solution. (C) 2013 Elsevier B.V. All rights reserved.