Results 271 to 280 of about 1,978,744 (337)
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Upper and lower critical solution temperatures in 1‐octanol solutions of polyethylene
British Polymer Journal, 1983AbstractCloud points of 1‐octanol solutions of four linear polyethylene samples having different molecular weights were measured visually in both regions of the upper and lower critical solution temperatures (UCST and LCST). From the (temperature, polymer weight fraction) phase diagrams drawn, the UCST and LCST were determined.
Yoichiro Muraoka +2 more
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Lower critical solution temperature study on cellulose diacetate-acetone solutions
European Polymer Journal, 1982Abstract Cloud points of acetone solutions of four well-fractionated samples of cellulose diacetate (degree of substitution = 2.46) have been measured at elevated temperatures. The molecular weight of the fractions ranged from 3.76 × 104 to 17.5 × 104.
H. Suzuki, K. Kamide, M. Saitoh
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Polymers for Advanced Technologies, 1996
A series of vinyl polymers with L-valine and L-leucine residues, and related copolymers with N-isopropylacrylamide, were studied in aqueous solution at different temperatures (25, 30 and 35°C) and at two ionic strengths (0.01 M and 0.1 M NaCl). The protonation behavior revealed great differences between the polymers that were attributed to the size of ...
Casolaro, Mario, Barbucci, R.
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A series of vinyl polymers with L-valine and L-leucine residues, and related copolymers with N-isopropylacrylamide, were studied in aqueous solution at different temperatures (25, 30 and 35°C) and at two ionic strengths (0.01 M and 0.1 M NaCl). The protonation behavior revealed great differences between the polymers that were attributed to the size of ...
Casolaro, Mario, Barbucci, R.
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The Journal of Physical Chemistry B, 2009
Previous studies of the critical behavior of ionic solutions in nonpolar solvents showed mainly upper critical solution temperatures. Now, we report for the solution of tetra-n-butyl ammonium bromide (N4444Br) in toluene a nearly closed miscibility loop, where the lower critical solution temperature (Tc=297.75+/-0.05 K, xc=0.0270+/-5x10(-4)) is located
Harro R, Dittmar, Wolffram H, Schröer
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Previous studies of the critical behavior of ionic solutions in nonpolar solvents showed mainly upper critical solution temperatures. Now, we report for the solution of tetra-n-butyl ammonium bromide (N4444Br) in toluene a nearly closed miscibility loop, where the lower critical solution temperature (Tc=297.75+/-0.05 K, xc=0.0270+/-5x10(-4)) is located
Harro R, Dittmar, Wolffram H, Schröer
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Journal of Polymer Science Part B: Polymer Physics, 1987
AbstractDilute solutions of polystyrene in cyclopentane are studied with four narrow‐distribution polymer fractions ranging in molecular weight from 1.6 × 105 to 1.8 × 106. Light scattering (total intensity) and viscosity measurements cover a temperature range spanning both “theta” temperatures: the limiting upper critical solution temperature (19.6°C)
Guy C. Berry +2 more
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AbstractDilute solutions of polystyrene in cyclopentane are studied with four narrow‐distribution polymer fractions ranging in molecular weight from 1.6 × 105 to 1.8 × 106. Light scattering (total intensity) and viscosity measurements cover a temperature range spanning both “theta” temperatures: the limiting upper critical solution temperature (19.6°C)
Guy C. Berry +2 more
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The molecular weight dependence of lower and upper critical solution temperatures
Journal of Polymer Science Part C: Polymer Symposia, 1970AbstractThe molecular weight dependence of the Lower Critical Solution Temperature in polymer solutions has been derived using the Prigogine smoothed potential cell model. Satisfactory agreement is obtained with experimental results for a number of systems.
G. Delmas, D. Patterson
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Hydrophobically modified polyglycidol - the control of lower critical solution temperature
Polymer Bulletin, 2003Polymers of glycidol (2,3-epoxypropanol-1) of different molar masses (between 2˙104 and 2˙105) and chain topology (linear and comb-like) were synthesised and used to obtain a series of temperature responsive water-soluble poly(glycidol-co-glycidol acetate)s.
Alicja Utrata +3 more
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Saccharide Effect on the Lower Critical Solution Temperature of Thermosensitive Polymers
Macromolecules, 1995Effects of low molecular weight saccharides in the presence and absence of salts on the lower critical solution temperature (LCST) of typical thermosensitive polymers such as Pluronics, poly-(N-isopropylacrylamide), and N-isopropylacrylamide copolymers with ionizable groups were examined.
Yong-Hee Kim +3 more
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Lower critical solution temperatures of polyisobutylene plus isomeric alkanes
Polymer, 1969Abstract Lower critical solution temperatures (LCST) have been obtained for polyisobutylene and some thirty isomeric pentanes, hexanes, heptanes and octanes. The LCSTs found with cyclic alkanes are about 125 deg. C higher than those with the corresponding normal alkanes.
J.-M Bardin, D Patterson
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Theory of phase separation in mixtures with lower critical solution temperature
The Journal of Physical Chemistry, 1992A thermodynamic theory of phase separation in mixtures possessing LCST is presented which incorporates chemical equilibrium theory to account for cross association between solute and solvent, Flory-Huggins theory for the difference of molecular volumes and NRTL equation for the interaction between molecules.
Ming Yu, Hideo Nishiumi
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