Counterion-Tunable therm. sensitivity of Strong Polyelectrolyte Brushes

被引:4
|
作者
Cai, Hongtao [1 ]
Kou, Ran [1 ]
Liu, Guangming [1 ]
机构
[1] Univ Sci & Technol China, Key Lab Surface & Interface Chem & Energy Catalys, Hefei Natl Lab Phys Sci Microscale, Anhui Higher Educ Inst,Dept Chem Phys, 96 JinZhai Rd, Hefei 230026, Anhui, Peoples R China
基金
中国国家自然科学基金;
关键词
QUARTZ-CRYSTAL MICROBALANCE; POLYMER BRUSHES; PENTABLOCK TERPOLYMER; PH RESPONSES; NANOCHANNELS; TEMPERATURE; ADSORPTION; TRANSPORT; CHANNELS; BEHAVIOR;
D O I
10.1021/acs.langmuir.9b02982
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
In this work, poly(sodium styrene sulfonate) brushes have been employed as a precursor to prepare thermosensitive strong polyelectrolyte brushes (SPBs) through a counterion exchange strategy. The substitution of hydrophilic Na+ counterions by hydrophobic tetraalkylphosphonium counterions leads to a thermoresponsivity of the SPBs. The thermosensitive properties including hydration, stiffness, and surface water wettability of the SPBs can be modulated by the type of the tetraalkylphosphonium counterions. Nevertheless, the wet thickness of the SPBs with tetraalkylphosphonium counterions does not exhibit an obvious temperature dependency due to the high steric barrier in the crowded environment of SPBs generated by the large tetraalkylphosphonium counterions. The mixtures of small Na+ counterions and large tetraalkylphosphonium counterions are employed to realize the thermosensitive wet thickness without sacrificing other thermoresponsive properties of the SPBs because the mixed counterions can bring both a certain hydrophobicity and some free space to the brushes. This work opens up the opportunities available for the use of counterions to tune the thermosensitivity of SPBs.
引用
收藏
页码:16862 / 16868
页数:7
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