scholarly journals Dynamics of multicomponent polymer mixtures via the random phase approximation including hydrodynamic interactions

1993 ◽  
Vol 26 (16) ◽  
pp. 4136-4143 ◽  
Author(s):  
A. Ziya Akcasu ◽  
Rudolf Klein ◽  
B. Hammouda
Keyword(s):  
Random Phase Approximation ◽  
Random Phase ◽  
Hydrodynamic Interactions ◽  
Phase Approximation ◽  
Polymer Mixtures ◽  
Multicomponent Polymer

scholarly journals Scattering of multicomponent polymer blends

2021 ◽  
Author(s):  
Henrich Frielinghaus
Keyword(s):  
Polymer Blends ◽  
Random Phase Approximation ◽  
Repeat Unit ◽  
Mean Field Theory ◽  
Random Phase ◽  
Mean Field ◽  
Phase Approximation ◽  
Field Phase ◽  
Phase Boundaries ◽  
Multicomponent Polymer

AbstractThe random phase approximation for polymer blends was developed by H. Benoît and described small angle scattering functions as well as mean field phase boundaries. It is a pure mean field theory that loses validity close to the real phase boundaries due to strong fluctuations. However, it gives a very clear roadmap about phase diagrams and scattering functions. A simplification of the random phase approximation is discussed that comes into effect when several polymers are mixed that involve a rather low number of chemically different repeat units. Then, the correlation functions of the same repeat unit pairs can be added up in a specific way such that the overall complexity for the calculations is reduced. The scattering functions and mean field phase boundaries are discussed within this concept. Graphical abstract

Interpretation of Preferential Adsorption Using Random Phase Approximation Theory

1995 ◽  
Vol 60 (10) ◽  
pp. 1641-1652 ◽  
Author(s):  
Henri C. Benoît ◽  
Claude Strazielle
Keyword(s):  
Approximation Theory ◽  
Random Phase Approximation ◽  
Virial Coefficient ◽  
Random Phase ◽  
Second Virial Coefficient ◽  
Solvent Mixture ◽  
Gyration Radius ◽  
Thermodynamic Quantities ◽  
Phase Approximation ◽  
Preferential Adsorption

It has been shown that in light scattering experiments with polymers replacement of a solvent by a solvent mixture causes problems due to preferential adsorption of one of the solvents. The present paper extends this theory to be applicable to any angle of observation and any concentration by using the random phase approximation theory proposed by de Gennes. The corresponding formulas provide expressions for molecular weight, gyration radius, and the second virial coefficient, which enables measurements of these quantities provided enough information on molecular and thermodynamic quantities is available.

Neutrino reactions onC12by the quasiparticle random-phase approximation (QRPA)

2010 ◽  
Vol 81 (2) ◽  
Author(s):  
Myung-Ki Cheoun ◽  
Eunja Ha ◽  
Su Youn Lee ◽  
K. S. Kim ◽  
W. Y. So ◽  
...  
Keyword(s):  
Random Phase Approximation ◽  
Random Phase ◽  
Phase Approximation ◽  
Quasiparticle Random Phase Approximation
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