Key Factors to Prepare Polyelectrolytes Showing Temperature-Sensitive Lower Critical Solution Temperature-type Phase Transitions in Water

2012 ◽  
Vol 65 (1) ◽  
pp. 91 ◽  
Author(s):  
Yuki Kohno ◽  
Hiroyuki Ohno
Keyword(s):  
Phase Transition ◽  
Lower Critical Solution Temperature ◽  
Alkyl Chain ◽  
Alkyl Chain Length ◽  
Phase Behaviour ◽  
Solution Temperature ◽  
Temperature Sensitive ◽  
Key Factors ◽  
Critical Solution Temperature ◽  
Type Phase

Tetrabutylphosphonium styrenesulfonate and its homopolymer showed a lower critical solution temperature-type phase transition in water. As the hydrophobicity of these monomeric and polymeric salts affects phase behaviour, the phase transition temperature of the polyelectrolyte was changed by the introduction of monomers having different alkyl chain length on the phosphonium cations.

scholarly journals Unexpected LCST-type phase behaviour of a poly(vinyl thiazolium) polymer in acetone

RSC Advances ◽  
2016 ◽  
Vol 6 (62) ◽  
pp. 57117-57121 ◽  
Author(s):  
Konrad Grygiel ◽  
Weiyi Zhang ◽  
Christophe Detrembleur ◽  
Jiayin Yuan
Keyword(s):  
Phase Transition ◽  
Lower Critical Solution Temperature ◽  
Acetone Solution ◽  
Phase Behaviour ◽  
Solution Temperature ◽  
Critical Solution Temperature ◽  
Type Phase

A poly(vinyl thiazolium) polymer in acetone solution exhibited an unexpected lower critical solution temperature (LCST)-type phase transition.

Material design of ionic liquids to show temperature-sensitive LCST-type phase transition after mixing with water

2011 ◽  
Vol 64 (12) ◽  
pp. 1560 ◽  
Author(s):  
Yuki Kohno ◽  
Hiroki Arai ◽  
Shohei Saita ◽  
Hiroyuki Ohno
Keyword(s):  
Phase Transition ◽  
Ionic Liquids ◽  
Material Design ◽  
Phase Behaviour ◽  
Solution Temperature ◽  
Temperature Sensitive ◽  
Critical Solution Temperature ◽  
Alkyl Chains ◽  
Type Phase ◽  
Separation Temperature

Phosphonium cations bearing different alkyl chains were coupled with several common anions so as to prepare ionic liquids (ILs) with diverse hydrophobicity. A temperature-driven phase behaviour of the mixture of various ILs and water has been examined. A few ILs were found to exhibit temperature-sensitive lower critical solution temperature (LCST)-type phase transition after mixing with water. The phase separation temperature (Tc) of the IL/water mixtures depended strongly on the hydrophobicity of the component ions as well as mixing ratio. The number of water molecules per ion pair in the IL phase (mwater) increased dramatically upon cooling. The temperature dependence of this parameter was found to be useful to predict the possibility of the ILs to show the LCST-type phase behaviour after mixing with water. Since the value of mwater depended on the ion structure, especially on the hydrophobicity, the Tc was accurately set out by suitably mixing two ILs with different hydrophobicity.

A polyelectrolyte-containing copolymer with a gas-switchable lower critical solution temperature-type phase transition

2019 ◽  
Vol 10 (2) ◽  
pp. 260-266 ◽  
Author(s):  
Jin-Jin Li ◽  
Yin-Ning Zhou ◽  
Zheng-Hong Luo ◽  
Shiping Zhu
Keyword(s):  
Phase Transition ◽  
Cloud Point ◽  
Lower Critical Solution Temperature ◽  
Solution Temperature ◽  
Critical Solution Temperature ◽  
Type Phase

A polyelectrolyte-containing copolymer with a CO2/N2-switchable cloud point, resulting from the gas-induced alternation of hydrophilicity, was prepared.

Design of Ionic Liquid-Derived Polyelectrolyte Gels Toward Reversible Water Absorption/Desorption System Driven by Small Temperature Change

2014 ◽  
Vol 67 (11) ◽  
pp. 1666 ◽  
Author(s):  
Yuki Deguchi ◽  
Yuki Kohno ◽  
Hiroyuki Ohno
Keyword(s):  
Ionic Liquid ◽  
Transition Temperature ◽  
Alkyl Chain ◽  
Alkyl Chain Length ◽  
Solution Temperature ◽  
Small Temperature ◽  
Critical Solution Temperature ◽  
Polyelectrolyte Gels ◽  
Type Phase ◽  
Chain Lengths

Suitably designed polyelectrolytes derived from tributyl-n-alkylphosphonium 3-sulfopropylmethacrylate-type ionic liquid (IL) monomers undergo a lower critical solution temperature (LCST)-type phase transition, and their transition temperature is a function of the alkyl chain length on the phosphonium cations. Based on this finding, we have successfully prepared chemically cross-linked polyelectrolyte gels, poly(IL) gels, to show the LCST-type phase change. The hydrated state of the prepared poly(IL) gels varied widely with temperature. They desorbed water by elevating the temperature only by a few degrees. Their transition temperature was finely controlled by mixing the composition of IL monomers with different alkyl chain lengths.

Temperature-Driven and Reversible Assembly of Homopolyelectrolytes Derived from Suitably Designed Ionic Liquids in Water

2013 ◽  
Vol 66 (11) ◽  
pp. 1393 ◽  
Author(s):  
Yuki Kohno ◽  
Yuki Deguchi ◽  
Naomi Inoue ◽  
Hiroyuki Ohno
Keyword(s):  
Ionic Liquids ◽  
Phase Change ◽  
Lower Critical Solution Temperature ◽  
Solution Temperature ◽  
Temperature Sensitive ◽  
Spherical Nanoparticles ◽  
Critical Solution Temperature ◽  
Type Phase ◽  
Diameter Change

Polycationic-type homopolymers derived from polymerisable ionic liquids with adequate hydrophobicity were prepared to form spherical nanoparticles in water that changed their diameter as a function of temperature. The diameter change was attributed to a temperature-sensitive and reversible lower critical solution temperature-type phase change of the polymers in water.

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