Results 261 to 270 of about 1,978,744 (337)

Prediction and Reasoning for the Occurrence of Lower Critical Solution Temperature in Aqueous Solution of Ionic Liquids

Industrial & Engineering Chemistry Research, 2019
In this work, the combined COSMO-SAC and Pitzer–Debye–Huckel model is used for the prediction of the liquid–liquid equilibrium for 252 binary ionic liquid solutions, including 234 LCST (lower critical solution temperature)-negative mixtures and 18 LCST ...
Y. Tsai, Shiang‐Tai Lin
semanticscholar   +1 more source

Poly[oligo(2-ethyl-2-oxazoline)acrylate]-Based Poly(ionic liquid) Random Copolymers with Coexistent and Tunable Lower Critical Solution Temperature- and Upper Critical Solution Temperature-Type Phase Transitions.

Langmuir, 2018
The synthesis of a series of dual thermosensitive nonionic-ionic random copolymers with varying compositions by reversible addition-fragmentation chain transfer polymerization is described.
Somdeb Jana, Yajnaseni Biswas, Md. Anas, A. Saha, T. Mandal   +4 more
semanticscholar   +1 more source

Transport Functions of Polymers with a Lower Critical Solution Temperature

Polymer Science, Series B, 2019
Polymeric derivatives of proteins are synthesized by the reaction of the amino groups of proteins with N,N-diethylacrylamides containing terminal carboxyl groups, having a molecular weight of (13–62) × 103, and exhibiting a lower critical solution temperature of 34–29°C. It is shown for the first time that the lower critical solution temperature of the
I. L. Valuev, L. V. Vanchugova, L. I. Valuev   +2 more
openaire   +1 more source

The Efficiency of Polymer Fractionation at Lower Critical Solution Temperatures

British Polymer Journal, 1978
AbstractThe efficiency of a single fractionation step (i.e. of the partition of a given polymer sample between the coexisting phases which form when its solution demixes) is governed by the variation of the mass ratio of the individual P‐mers with chain length.
B. A. Wolf, H. F. Bieringer, J. W. Breitenbach   +2 more
openaire   +1 more source

Lower critical solution temperatures of polybutadiene solutions

Journal of Polymer Science Part B: Polymer Letters, 1967
Abstract The lower critical solution temperature (LCST) is observed in polymer solvent systems as a rather high temperature above which the solution separates into two phases. This is a relatively recently discovered phenomenon, since it normally occurs above the boiling point of the solvent.
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The structure of polyoxyethylene solutions with lower critical temperatures of mixing

Polymer Science U.S.S.R., 1974
The phase equilibrium, light scattering and viscosity of solutions of polyoxyethylene (POE) in water have been studied. The molecular weights, second virial coefficients and size and concentration fluctuations of the macromolecules and particles causing light scattering have been calculated.
A.A. Tager, S.A. Vshivkov, V.M. Andreyeva, T.V. Sekacheva   +3 more
openaire   +1 more source

Development of high flux ultrafiltration polyphenylsulfone membranes applying the systems with upper and lower critical solution temperatures: Effect of polyethylene glycol molecular weight and coagulation bath temperature

Journal of Membrane Science, 2018
A novel phase inversion technique for preparation of high flux polyphenylsulfone (PPSU) ultrafiltration membranes employing the systems which feature upper critical solution temperature (UCST), gel point and lower critical solution temperature (LCST) is ...
T. Plisko, A. Bildyukevich, Yana Karslyan, A. Ovcharova, V. Volkov   +4 more
semanticscholar   +1 more source

Upper and lower critical solution temperatures in poly (ethylene glycol) solutions

Polymer, 1976
Upper and lower critical solution temperatures have been determined for solutions of poly(ethylene glycol) in t-butyl acetate and water over the molecular weight range of Mη = 2.18 × 103 to ∼1020 × 103. The phase diagram for solutions of poly(ethylene glycol) (Mη = 719 × 103) in t-butyl acetate was expressed as the ‘hour glass’ type, while the phase ...
Susumu Saeki, Nobuhiro Kuwahara, Mitsuo Nakata, Motozo Kaneko   +3 more
openaire   +1 more source

Lower critical solution temperature and hydrophobic hydration in aqueous polymer solutions

Colloid & Polymer Science, 1994
Phase diagrams of aqueous solutions of poly(N-vinyl caprolactam) (PVCL), N-vinyl caprolactam copolymer with vinylamine (3.8 mol%) (CP(VCL-VA)), and poly(N-vinyl propylacetamide) (PVPA) were shown to be binodal curves with lower critical solution temperatures (LCST) in the range 304–313.5 K and critical concentrations in the range of 0.02–0.08 polymer ...
A. A. Tager, A. P. Safronov, E. A. Berezyuk, I. Yu. Galaev   +3 more
openaire   +1 more source

Microcalorimetric detection of lower critical solution temperatures in aqueous polymer solutions

The Journal of Physical Chemistry, 1990
A sensitive solution microcalorimeter was used to study lower critical solution temperatures (LCSTs) of aqueous polymer solutions. Endotherms with enthalpies on the order of the strength of hydrogen bonds were observed at temperatures concurring with LCSTs detected by classical cloud-point measurements for solutions of poly(N-isopropylacrylamide ...
Schild, Howard G., Tirrell, David A.
openaire   +2 more sources