Studies on the viscosity of solutions of limited miscibility near the phase-separation temperature. Nitrobenzene—n-hexane and nitrobenzene—n-heptane

1984 ◽  
Vol 107 (6) ◽  
pp. 575-578 ◽  
Author(s):  
A. Dega-Dałkowska
Keyword(s):  
Phase Separation ◽  
Phase Separation Temperature ◽  
Separation Temperature

scholarly journals Influence of Salt on the Self-Organization in Solutions of Star-Shaped Poly-2-alkyl-2-oxazoline and Poly-2-alkyl-2-oxazine on Heating

Polymers ◽  
2021 ◽  
Vol 13 (7) ◽  
pp. 1152
Author(s):  
Tatyana Kirila ◽  
Anna Smirnova ◽  
Alla Razina ◽  
Andrey Tenkovtsev ◽  
Alexander Filippov
Keyword(s):  
Phase Separation ◽  
Salt Concentration ◽  
Monomer Unit ◽  
Salt Content ◽  
The Self ◽  
Self Organization ◽  
Phase Separation Temperature ◽  
The Core ◽  
Separation Temperature ◽  
Water Salt

The water–salt solutions of star-shaped six-arm poly-2-alkyl-2-oxazines and poly-2-alkyl-2-oxazolines were studied by light scattering and turbidimetry. The core was hexaaza[26]orthoparacyclophane and the arms were poly-2-ethyl-2-oxazine, poly-2-isopropyl-2-oxazine, poly-2-ethyl-2-oxazoline, and poly-2-isopropyl-2-oxazoline. NaCl and N-methylpyridinium p-toluenesulfonate were used as salts. Their concentration varied from 0–0.154 M. On heating, a phase transition was observed in all studied solutions. It was found that the effect of salt on the thermosensitivity of the investigated stars depends on the structure of the salt and polymer and on the salt content in the solution. The phase separation temperature decreased with an increase in the hydrophobicity of the polymers, which is caused by both a growth of the side radical size and an elongation of the monomer unit. For NaCl solutions, the phase separation temperature monotonically decreased with growth of salt concentration. In solutions with methylpyridinium p-toluenesulfonate, the dependence of the phase separation temperature on the salt concentration was non-monotonic with minimum at salt concentration corresponding to one salt molecule per one arm of a polymer star. Poly-2-alkyl-2-oxazine and poly-2-alkyl-2-oxazoline stars with a hexaaza[26]orthoparacyclophane core are more sensitive to the presence of salt in solution than the similar stars with a calix[n]arene branching center.

Changes of Two Phase Composition in Phase Separation Process of Na2O-CaO-Al2O3-B2O3-SiO2-TiO2 System

2010 ◽  
Vol 105-106 ◽  
pp. 739-742
Author(s):  
Wen Li Zhang ◽  
Shui Jing Gao ◽  
Jing Fu Wang ◽  
Jian Guo Jin
Keyword(s):  
Phase Composition ◽  
Phase Separation ◽  
Separation Process ◽  
Raw Material ◽  
Network Adjustment ◽  
Two Phase ◽  
Rich Phase ◽  
Phase Separation Temperature ◽  
Phase Separation Process ◽  
Separation Temperature

The titaniferous blast furnace slag was selected as a kind of main raw material in the glass preparation. The glass system was separated phase into boron-rich phase and silicon-rich phase in Na2O-CaO-Al2O3-B2O3-SiO2-TiO2 system, and the changes of the two-phase composition after heat treated at different temperatures were studied. Results indicated that the network adjustment oxide existing in boron-rich phase was only CaO when phase separation temperature was below 750°C, and Na2O concentrated in silicon-rich phase. With the phase separation temperature rising, the distribution of Al2O3 and CaO was almost unchanged, whereas Na2O transferred from the silicon-rich phase to boron-rich phase gradually. In the phase separation process, TiO2 concentrated and crystallized on the phase separation interface.

Study on the Precipitation Polymerization of Acrylamide and Methacrylic Acid in Ethanol by Conductimetry: Phase- Separation Prior to Polymerization

2012 ◽  
Vol 455-456 ◽  
pp. 639-644 ◽  
Author(s):  
Min Li ◽  
Hen Mei Ni
Keyword(s):  
Phase Separation ◽  
Methacrylic Acid ◽  
Monomer Concentration ◽  
Precipitation Polymerization ◽  
Abrupt Decrease ◽  
Methyl Group ◽  
Phase Separation Temperature ◽  
Monomer Ratio ◽  
Polymerization System ◽  
Separation Temperature

Conductimetry was employed to investigate the precipitation polymerization of acrylamide/methacrylic acid (AAm/MAA) in ethanol (EtOH). The conductivity change vs. temperature of AAm/MAA-EtOH as well as the effects of monomer ratio and monomer concentration was studied. An abrupt decrease of conductivity in AAm/MAA-EtOH was observed at ca 25°C, indicating the phase separation of monomers and EtOH. As the ratios of AAm/MAA increased from 2/1 to 5/1 (wt/wt), the phase separation temperature increased from 22 to 31°C. The higher the monomers concentration, the temperature of phase separation is lower. These results proved that the lyophobicity of methyl group of MAA dominated the phase separation and the precipitation polymerization system of AAm/MAA-EtOH, by which the microspheres were prepared, was heterogeneous prior to the polymerization.

Performance of the Castor Oil in Methanol-Gasoline as a Bi-Functional Additive

2018 ◽  
Vol 777 ◽  
pp. 232-237 ◽  
Author(s):  
Jing Fang Xu ◽  
Yu Ying Xue ◽  
Man Liu ◽  
Fa Wang Zhang ◽  
Ying Tang ◽  
...  
Keyword(s):  
Phase Separation ◽  
Phase Stability ◽  
Vapour Pressure ◽  
Castor Oil ◽  
Phase Separation Temperature ◽  
Functional Additive ◽  
Oil Derivatives ◽  
Separation Temperature ◽  
Saturation Vapour Pressure

In this paper, the castor oil, as additives, has been investigated on the phase separation temperature of M15, M30, M50 and M65 methanol gasoline at-25.0°C to 40.0°C, respectively. The effect of the additives on the phase stability and saturation vapour pressure was discussed. It was found that castor oil derivatives have good phase stability to various ratio methanol gasoline blends. Introducing water in the methanol gasoline blends need much amount of methyl castor oil to realize phase mixable. Besides, the castor oil can depress the saturation vapour pressure of methanol gasoline effective as well. With these data, it can be concluded that the castor oil have the great potential to be used gasoline-methanol additives.

Selenite decreases phase separation temperature in rat lens

1986 ◽  
Vol 42 (5) ◽  
pp. 503-506 ◽  
Author(s):  
Thomas R. Shearer ◽  
Larry L. David ◽  
Ruth S. Anderson
Keyword(s):  
Phase Separation ◽  
Phase Separation Temperature ◽  
Separation Temperature

scholarly journals Oxidation of gamma II-crystallin solutions yields dimers with a high phase separation temperature.

1995 ◽  
Vol 92 (4) ◽  
pp. 1067-1071 ◽  
Author(s):  
J. Pande ◽  
A. Lomakin ◽  
B. Fine ◽  
O. Ogun ◽  
I. Sokolinski ◽  
...  
Keyword(s):  
Phase Separation ◽  
Phase Separation Temperature ◽  
Separation Temperature ◽  
High Phase
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