Crossover of domain-growth behavior from percolation to cluster regime in phase separation of an off-critical polymer mixture

1997 ◽  
Vol 107 (5) ◽  
pp. 1634-1644 ◽  
Author(s):  
Hiroyuki Takeno ◽  
Takeji Hashimoto
Keyword(s):  
Phase Separation ◽  
Growth Behavior ◽  
Domain Growth ◽  
Polymer Mixture

scholarly journals Unusual domain growth behavior in the compressible ising model

2008 ◽  
Vol 38 (1) ◽  
Author(s):  
S. J. Mitchell ◽  
Luiz F. C. Pereira ◽  
D. P. Landau
Keyword(s):  
Ising Model ◽  
Growth Behavior ◽  
Domain Growth

Two-step phase separation of a polymer mixture. I. New scaling analysis for the main scattering peak

2000 ◽  
Vol 112 (15) ◽  
pp. 6886-6896 ◽  
Author(s):  
Takeji Hashimoto ◽  
Masaki Hayashi ◽  
Hiroshi Jinnai
Keyword(s):  
Phase Separation ◽  
Polymer Mixture ◽  
Scaling Analysis

Modification of Interfacial Properties of Polymer Blends with Diblock Copolymer

1996 ◽  
Vol 461 ◽  
Author(s):  
S. Kim ◽  
C. C. Han
Keyword(s):  
Molecular Weight ◽  
Phase Separation ◽  
Polymer Blends ◽  
Diblock Copolymer ◽  
Diblock Copolymers ◽  
Phase Region ◽  
Domain Growth ◽  
Two Phase ◽  
Phase Separation Kinetics ◽  
Styrene Butadiene

ABSTRACTThe effect of diblock copolymer on the phase-separation process of polymer blends has been investigated by using light scattering and optical microscopic observations. To quench the system into the two phase region, a shear-jump technique is employed instead of the conventional temperature-jump technique. The samples studied are blends of low-molecular-weight polystyrene and polybutadiene with and without added styrene-butadiene block copolymer as a compatibilizer. It was observed that the addition of diblock copolymers could accelerate the phase separation kinetics depending on the shear history. As the concentration of diblock copolymer increases, the distribution of domain sizes becomes narrower and the growth rate slows down. The extent of slowing-down depends on the molecular weight and concentration of the copolymer. The time dependence of domain growth is clearly observed with optical microscopy.

THE EFFECT OF VISCOSITY ON THE PHASE SEPARATION DYNAMICS OF BINARY IMMISCIBLE MIXTURE COUPLED WITH REVERSIBLE REACTION

2010 ◽  
Vol 21 (12) ◽  
pp. 1479-1488 ◽  
Author(s):  
HUI LI ◽  
HONG LIU ◽  
ZHONG-YUAN LU ◽  
QIN WANG ◽  
CHIA-CHUNG SUN
Keyword(s):  
Phase Separation ◽  
Reaction Rate ◽  
Domain Size ◽  
Reaction Rates ◽  
Two Dimensions ◽  
Domain Growth ◽  
Reversible Reaction ◽  
Growth Exponent ◽  
High Reaction ◽  
Immiscible Mixture

The phase-separating system coupled with a simple reversible reaction A ⇌ B in a binary immiscible mixture due to critical quench is investigated with Lowe-Andersen temperature controlling method in two dimensions. The system viscosity strongly influences the asymptotic relationship between the excess energy (characterizing the domain growth) and the reaction rate. The competition between different dynamic factors results in the steady states with characteristic domain sizes. For low viscosities, the domain growth exponent approximates to 0.4 in the cases of low reaction rates and to 0.25 in the cases of high reaction rates, which shows the suppressing effects of high reversible reaction rates on the phase separation. However, in the cases of high viscosities, we find a 0.25 scaling with low reaction rates but a 0.5 scaling with high reaction rates. In these cases, high viscosities prevent mass transport in the binary mixture, consequently result in much smaller steady state domain sizes. Therefore the domain sizes with high viscosities and low reaction rates are very similar to those with low viscosities and high reaction rates, and the dependence of domain sizes on the reaction rates are similar. For the high-viscosity systems with high reaction rates, the domain sizes are predominantly controlled by the reaction rates, therefore we can observe stronger dependence of domain size on the reaction rate.

Heterogeneous percolation-to-cluster transition in phase separation of an off-critical polymer mixture

1999 ◽  
Vol 110 (7) ◽  
pp. 3612-3620 ◽  
Author(s):  
Hiroyuki Takeno ◽  
Eiji Nakamura ◽  
Takeji Hashimoto
Keyword(s):  
Phase Separation ◽  
Polymer Mixture
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