文献类型：期刊文献

英文题名：Effect of Counterions on the Interaction among Concentrated Spherical Polyelectrolyte Brushes

作者：Wang, Yunwei[1,2];Li, Li[1,2];Wang, Yiming[1,2];Yang, Qingsong[1,2];Ye, Zhishuang[1,2];Sun, Liang[3];Yang, Fan[1,2];Guo, Xuhong[1,2,3]

机构：[1]East China Univ Sci & Technol, Minist Educ, Engn Res Ctr Large Scale Reactor Engn & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Int Joint Res Ctr Green Energy Chem Engn, Shanghai 200237, Peoples R China;[3]Shihezi Univ, Engn Res Ctr Xinjiang Bingtuan Mat Chem Engn, Shihezi 832000, Peoples R China

年份：2021

卷号：13

期号：12

外文期刊名：POLYMERS

收录：;EI(收录号：20212610547523);WOS:【SCI-EXPANDED(收录号:WOS:000666487300001)】；

基金：This research was funded by Natural Science Foundation of China, grant number 51773061 and 51761135128. This research also was funded by the Key Scientific and Technological Project of Xinjiang Bingtuan, grant number 2018AB025.

语种：英文

外文关键词：spherical polyelectrolyte brush; counterions; WAXS; rheology; SAXS

摘要：The effect of counterions on interactions among spherical polyelectrolyte brushes (SPBs) was systematically investigated by rheology, small-angle X-ray scattering (SAXS) and wide-angle X-ray scattering (WAXS). The SPB particles consist of a solid polystyrene (PS) core with a diameter of ca.100 nm and a chemically grafted poly-(acrylic acid) (PAA) brush layer. Metal ions of different valences (Na+, Mg2+ and Al3+) were used as counterions to study the interactions among concentrated SPBs. The so-called "structure factor peak" in SAXS, the "local ordered structure peak" in WAXS and rheological properties indicated the interactions among concentrated SPBs. Combining SAXS, WAXS and rheology, the formation mechanism of the local ordered structure among PAA chains in the overlapped area of adjacent SPB, which was generated due to the bridge function of counterions, was confirmed. In contrast, excessive counterions shielded the electrostatic interaction among PAA chains and destroyed the local ordered structure. This work enriches our understanding of the polyelectrolyte assembly in concentrated SPBs under the effect of counterions and lays the foundations for SPB applications.