Upper Critical Solution Temperature Phase Behavior, Composition Fluctuations, and Complex Formation in Poly (Vinyl Methyl Ether)/D2O Solutions:  Small-Angle Neutron-Scattering Experiments and Wertheim Lattice Thermodynamic Perturbation Theory Predictions

2006 ◽  
Vol 110 (11) ◽  
pp. 5321-5329 ◽  
Author(s):  
Erik Nies ◽  
Ting Li ◽  
Hugo Berghmans ◽  
Richard K. Heenan ◽  
Stephen M. King
Keyword(s):  
Perturbation Theory ◽  
Small Angle Neutron Scattering ◽  
Solution Temperature ◽  
Temperature Phase ◽  
Thermodynamic Perturbation Theory ◽  
Vinyl Methyl ◽  
Critical Solution Temperature ◽  
Vinyl Methyl Ether ◽  
Upper Critical Solution Temperature ◽  
Composition Fluctuations

Polymer Fractionation at a Lower Critical Solution Temperature Phase Boundary

1967 ◽  
Vol 40 (5) ◽  
pp. 1544-1552
Author(s):  
C. H. Baker ◽  
C. S. Clemson ◽  
G. Allen
Keyword(s):  
Molecular Weight ◽  
Phase Boundary ◽  
Lower Critical Solution Temperature ◽  
Solution Temperature ◽  
Temperature Phase ◽  
Critical Solution Temperature ◽  
Upper Critical Solution Temperature ◽  
Two Samples ◽  
Polymer Fractionation ◽  
Molecular Weight Fractions

Abstract The influence of pressure on a lower critical solution temperature is much more pronounced than on an upper critical solution temperature. Accordingly it is possible to control phase separation at a LCST phase boundary under isothermal conditions by merely adjusting the pressure on the system. An apparatus has been constructed to investigate the isothermal fractionation of polyisobutene in which precipitation is controlled by pressure. Two samples of polyisobutene of Mv=1.76×106 and 9.0×104 have been fractionated in isopentane solution so as to yield up to six and nine fractions respectively. The integral molecular weight distribution curves thus obtained are compared with those obtained from conventional fractionations at an UCST. The sensitivity of the method is poor with regard to the separation of low molecular weight fractions and degradation occurs at the higher temperatures to an appreciable extent.

Unification of lower and upper critical solution temperature phase behavior of globular protein solutions in the presence of multivalent cations

Soft Matter ◽  
2020 ◽  
Vol 16 (8) ◽  
pp. 2128-2134 ◽  
Author(s):  
Nafisa Begam ◽  
Olga Matsarskaia ◽  
Michael Sztucki ◽  
Fajun Zhang ◽  
Frank Schreiber
Keyword(s):  
Phase Behavior ◽  
Globular Protein ◽  
Solution Temperature ◽  
Protein Solutions ◽  
Temperature Phase ◽  
Critical Solution Temperature ◽  
Upper Critical Solution Temperature

Here we report that a unified LCST and UCST phase behavior in protein solutions can be achieved by tuning the concentration of multivalent salts.

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