Difference in lower critical solution temperature behavior between random copolymers and a homopolymer having solvatophilic and solvatophobic structures in an ionic liquid

Article Abstract:

The investigation of the solubility and phase behavior of poly(benzyl methacrylate) (PBzMA) and poly(styrene-co-methyl methacrylate)(P(St-co-MMA)) in a hydrophobic liquid, 1-ethyl-3-methylimidazolium bis(trifluoromethanesulfone) imide ([[C.sub.2]mim][N[Tf.sub.2]]) as a function of temperature is carried out and the distinction in lower critical solution temperature (LCST) behavior in an ionic liquid (IL) between random copolymers and a homopolymer having solvatophobic and solvatophilic structures is discussed. It is observed that the coil-to-collapse change is of the first-order type and that the distribution of the solvatophilic and solvatophobic groups on the polymer chains influences the LCST-type stage separation of the polymers in an ionic liquid substantially.

Optical properties, Solvation, Light scattering, Styrene, Structure, Chemical properties, Copolymers

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Physical properties of proton conducting membranes based on a protic ionic liquid

Article Abstract:

The physical properties of proton conducting polymer membranes based on a protic ionic liquid (IL) are examined. The results have shown a change in the glass transition temperature and in the temperature dependence of the conductivity with increasing polymer content, which are related to the physical confinement of the IL in the polymer membrane.

Infrared spectroscopy, Ionic solutions, Heat, Properties, Heat conduction, Proton exchange membrane fuel cells

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