scholarly journals Viscoelastic effects on early stage of spinodal decomposition in dynamically asymmetric polymer blends

2006 ◽  
Vol 124 (10) ◽  
pp. 104904 ◽  
Author(s):  
Mikihito Takenaka ◽  
Hiroyuki Takeno ◽  
Takeji Hashimoto ◽  
Michihiro Nagao
Keyword(s):  
Polymer Blends ◽  
Spinodal Decomposition ◽  
Early Stage ◽  
Viscoelastic Effects

Distinctive phase separation dynamics of polymer blends: roles of Janus nanoparticles

2019 ◽  
Vol 21 (5) ◽  
pp. 2651-2658 ◽  
Author(s):  
Qing Li ◽  
Liquan Wang ◽  
Jiaping Lin ◽  
Liangshun Zhang
Keyword(s):  
Phase Separation ◽  
Polymer Blends ◽  
Spinodal Decomposition ◽  
Late Stage ◽  
Early Stage ◽  
Janus Nanoparticles

The present work demonstrates that Janus nanoparticles uniquely promote the phase separation of polymer blends at the early stage of spinodal decomposition, but impede it at the late stage.

scholarly journals Phase Separation by Spinodal Decomposition in Polymer Blends Under a Single and Double Quench: a Computational Study

2021 ◽  
Author(s):  
Tuyet Tran
Keyword(s):  
Phase Separation ◽  
Polymer Blends ◽  
Spinodal Decomposition ◽  
Computational Study ◽  
Early Stage ◽  
Critical Factor ◽  
Domain Size ◽  
Secondary Structures ◽  
Numerical Results ◽  
Numerical Work

A mathematical model and computer simulations are used to describe the dynamics of thermally induced phase separation (TIPS) by spinodal decomposition for polymer blends (single quench and double quench) using the nonlinear Cahn-Hilliard theory and the Flory-Huggins-de Gennes free energy. The importance of TIPS is to enhance material properties such as toughness, impact resistance and elasticity. Therefore, controlling the morphology is a critical factor in optimizing performance. The numerical results for the single quench are consistent with known characteristics of phase separation by spinodal decomposition observed in polymer blends. The numerical results for double quenching replicate recently published experimental and numerical work. Under a double quench the numerical work shows that a critical quench depth exists before secondary phase separation occurs, the growth rate of the primary and secondary structures are dependent on domain size and early stage dynamics for the secondary structures, after the second jump, appears to follow the linear Cahn-Hilliard theory.

scholarly journals Phase Separation by Spinodal Decomposition in Polymer Blends Under a Single and Double Quench: a Computational Study

2021 ◽  
Author(s):  
Tuyet Tran
Keyword(s):  
Phase Separation ◽  
Polymer Blends ◽  
Spinodal Decomposition ◽  
Computational Study ◽  
Early Stage ◽  
Critical Factor ◽  
Domain Size ◽  
Secondary Structures ◽  
Numerical Results ◽  
Numerical Work

A mathematical model and computer simulations are used to describe the dynamics of thermally induced phase separation (TIPS) by spinodal decomposition for polymer blends (single quench and double quench) using the nonlinear Cahn-Hilliard theory and the Flory-Huggins-de Gennes free energy. The importance of TIPS is to enhance material properties such as toughness, impact resistance and elasticity. Therefore, controlling the morphology is a critical factor in optimizing performance. The numerical results for the single quench are consistent with known characteristics of phase separation by spinodal decomposition observed in polymer blends. The numerical results for double quenching replicate recently published experimental and numerical work. Under a double quench the numerical work shows that a critical quench depth exists before secondary phase separation occurs, the growth rate of the primary and secondary structures are dependent on domain size and early stage dynamics for the secondary structures, after the second jump, appears to follow the linear Cahn-Hilliard theory.

scholarly journals The Effects of Inhomogeneous Elasticity and Dislocation on Thermodynamics and the Kinetics of the Spinodal Decomposition of a Fe-Cr System: A Phase-Field Study

Metals ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 1209
Author(s):  
Wooseob Shin ◽  
Jeonghwan Lee ◽  
Kunok Chang
Keyword(s):  
Spinodal Decomposition ◽  
Phase Field ◽  
Early Stage ◽  
Field Method ◽  
Phase Field Method ◽  
Precipitate Size ◽  
System A ◽  
Phase Separation Kinetics ◽  
Cr Concentration ◽  
Cr System

The effects of inhomogeneous elasticity and dislocation on the microstructure evolution of α′ precipitate in a Fe-Cr system was investigated using a Computer Coupling of Phase Diagrams and Thermochemistry (CALPHAD)-type free energy incorporated phase-field method. In order to simulate the precipitation behavior by phase-field modeling in consideration of inhomogeneous elasticity, a Multiphysics Object-Oriented Simulation Environment (MOOSE) framework was used, which makes it easy to use powerful numerical means such as parallel computing and finite element method (FEM) solver. The effect of inhomogeneous elasticity due to the compositional inhomogeneity or the presence of dislocations affects the thermodynamic properties of the system was investigated, such as the lowest Cr concentration at which spinodal decomposition occurs. The effect of inhomogeneous elasticity on phase separation kinetics is also studied. Finally, we analyzed how inhomogeneous elasticity caused by compositional fluctuation or dislocation affects microstructure characteristics such as ratio between maximum precipitate size with respect to the average on early stage and later stage, respectively.

scholarly journals A Thorny Problem? Spinodal Decomposition in Polymer Blends

2020 ◽  
Vol 53 (11) ◽  
pp. 4137-4140
Author(s):  
Julia S. Higgins ◽  
João T. Cabral
Keyword(s):  
Polymer Blends ◽  
Spinodal Decomposition
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