Pressure Response of a Thermo-responsive Polymer in an Ionic Liquid
Pressure Response of a Thermo-responsive Polymer in an Ionic Liquid
复制标题
热响应聚合物在离子液体中的压力响应
DOI：
10.1021/acs.macromol.6b01987
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发表时间：
2016
期刊：
影响因子：
5.5
通讯作者：
Mitsuhiro Shibayama
中科院分区：
文献类型：
--
作者：
Kazu Hirosawa;Kenta Fujii;Takeshi Ueki;Yuzo Kitazawa;Masayoshi Watanabe;Mitsuhiro Shibayama
研究了压力对离子液体（IL）溶液中低临界溶液温度（LCST）型热响应聚合物相行为的影响。IL溶液的云点温度随压力单调升高，这与以往报道的常规聚合物水溶液的云点温度呈现凸向上的压力依赖关系有很大不同。我们比较了IL和水体系，并得出结论，这种差异是由它们的溶剂化机制造成的。动态光散射（DLS）测量显示，在云点压力下，除了快速模式（对应于分子弥散）外，还出现了慢模式（对应于聚集），表明压力诱导相分离的开始。这项工作有助于从根本上理解高压下聚合物在IL体系中的相行为。
We investigated pressure effects on the lower critical solution temperature (LCST)-type phase behavior of a thermoresponsive polymer in an ionic liquid (IL) solution. The cloud point temperature of the IL solution increased monotonically with pressure, which was quite different from that of conventional aqueous polymer solutions reported in previous work, which exhibited a convex-upward-type pressure dependence. We compared the IL and aqueous systems and concluded that the difference results from their solvation mechanisms. Dynamic light scattering (DLS) measurements showed an appearance of a slow mode (corresponding to aggregation) in addition to the fast mode (corresponding to molecular dispersion) at the cloud point pressure, indicating an onset of pressure-induced phase separation. This work contributes to the fundamental understanding of the phase behavior of polymers in IL systems under high pressure.