Preparation of a Unique Microporous Structure via Two Step Phase Separation in the Course of Drying a Ternary Polymer Solution

Langmuir ◽  
2007 ◽  
Vol 23 (24) ◽  
pp. 12397-12405 ◽  
Author(s):  
Jae-Kyung Kim ◽  
Kentaro Taki ◽  
Masahiro Ohshima
Keyword(s):  
Phase Separation ◽  
Polymer Solution ◽  
Microporous Structure ◽  
Ternary Polymer

Mass-transfer driven spinodal decomposition in a ternary polymer solution

Soft Matter ◽  
2019 ◽  
Vol 15 (23) ◽  
pp. 4614-4628 ◽  
Author(s):  
Douglas R. Tree ◽  
Lucas F. Dos Santos ◽  
Caden B. Wilson ◽  
Timothy R. Scott ◽  
Jan Ulric Garcia ◽  
...  
Keyword(s):  
Mass Transfer ◽  
Phase Separation ◽  
Polymer Solution ◽  
Fluid Model ◽  
Combined Effects ◽  
Phase Separation Kinetics ◽  
Two Fluid Model ◽  
Ternary Polymer ◽  
Two Fluid ◽  
Separation Kinetics

A study of the combined effects of both mass transfer and phase separation kinetics on the widely used process of nonsolvent induced phase separation (NIPS) via a two-fluid model.

scholarly journals Viscoelastic phase separation model for ternary polymer solutions

2021 ◽  
Vol 154 (10) ◽  
pp. 104903
Author(s):  
Kenji Yoshimoto ◽  
Takashi Taniguchi
Keyword(s):  
Phase Separation ◽  
Polymer Solutions ◽  
Ternary Polymer ◽  
Separation Model

Solidification characteristics of polymer solution during polyvinylidene fluoride membrane preparation by nonsolvent-induced phase separation

2013 ◽  
Vol 438 ◽  
pp. 77-82 ◽  
Author(s):  
Toru Ishigami ◽  
Keisuke Nakatsuka ◽  
Yoshikage Ohmukai ◽  
Eiji Kamio ◽  
Tatsuo Maruyama ◽  
...  
Keyword(s):  
Phase Separation ◽  
Polymer Solution ◽  
Polyvinylidene Fluoride ◽  
Membrane Preparation

scholarly journals A computational study of phase separation in polymer solutions under a double quench

2021 ◽  
Author(s):  
Ehsan Hosseini
Keyword(s):  
Phase Separation ◽  
Polymer Solution ◽  
Spinodal Decomposition ◽  
Computational Study ◽  
Stable State ◽  
Thermal Quenching ◽  
Nucleation And Growth ◽  
Two Dimensions ◽  
Numerical Work ◽  
Binary Polymer

Polymer-dispersed liquid crystals (PDLCs) are a relatively new class of materials used for many applications ranging from switchable windows to projection displays. PDLSs are formed by spinodal decomposition induced by thermal quenching or polymerization. The objective of the present study is to introduce a new mechanism of phase separation in a binary polymer solution and develop a mathematical model and computer simulation to describe the phase separation during the early and intermediate stages of nucleation and growth and spinodal decomposition induced by thermal double quenching. The growth equilibrium limits of phase separation as well as phase transition are calculated by taking into consideration the Flory-Huggins theory for the free energy of mixing. A two step quench is modeled using Cahn-Hilliard theory for asymmetric binary polymer solution which is quenched from a stable state in the one-phase region to a metastable region where nucleation and growth occurs. The solution is allowed to coarsen for different time periods before a second quench was applied to a point further inside the phase diagram. The numerical results in two dimensions replicate the experimental and numerical work that has been recently done and published.

scholarly journals A computational study of phase separation in polymer solutions under a double quench

2021 ◽  
Author(s):  
Ehsan Hosseini
Keyword(s):  
Phase Separation ◽  
Polymer Solution ◽  
Spinodal Decomposition ◽  
Computational Study ◽  
Stable State ◽  
Thermal Quenching ◽  
Nucleation And Growth ◽  
Two Dimensions ◽  
Numerical Work ◽  
Binary Polymer

Polymer-dispersed liquid crystals (PDLCs) are a relatively new class of materials used for many applications ranging from switchable windows to projection displays. PDLSs are formed by spinodal decomposition induced by thermal quenching or polymerization. The objective of the present study is to introduce a new mechanism of phase separation in a binary polymer solution and develop a mathematical model and computer simulation to describe the phase separation during the early and intermediate stages of nucleation and growth and spinodal decomposition induced by thermal double quenching. The growth equilibrium limits of phase separation as well as phase transition are calculated by taking into consideration the Flory-Huggins theory for the free energy of mixing. A two step quench is modeled using Cahn-Hilliard theory for asymmetric binary polymer solution which is quenched from a stable state in the one-phase region to a metastable region where nucleation and growth occurs. The solution is allowed to coarsen for different time periods before a second quench was applied to a point further inside the phase diagram. The numerical results in two dimensions replicate the experimental and numerical work that has been recently done and published.

Phase Separation in Ternary Polymer Solutions Induced by Solvent Loss

2002 ◽  
Vol 35 (13) ◽  
pp. 5153-5160 ◽  
Author(s):  
Ian Hopkinson ◽  
Matthew Myatt
Keyword(s):  
Phase Separation ◽  
Polymer Solutions ◽  
Solvent Loss ◽  
Ternary Polymer

Producing PVP Nanofibers by Electrospinning in N2

2012 ◽  
Vol 560-561 ◽  
pp. 701-708 ◽  
Author(s):  
Lu Li ◽  
Jie Xu ◽  
Tao Fang ◽  
Jin Geng ◽  
Detlef Freitag ◽  
...  
Keyword(s):  
Mass Transfer ◽  
Phase Equilibrium ◽  
Phase Separation ◽  
Phase Behavior ◽  
Polymer Solution ◽  
Aspen Plus ◽  
Good Choice ◽  
The Other ◽  
Binary Phase ◽  
Novel Method

Electrospinning combined with nonsolvent-induced phase separation is a simple and novel method to produce porous nanofibers. In the study, Poly (vinylpyrrolidone) (PVP) nanofibers were fabricated using an electrospinning approach complemented by compressed nitrogen (N). N2 was used as the nonsolvent of choice. Besides, the tun2ning of N2 pressure and temperature can impact the nanofibers’ morphologies by altering phase behavior and mass transfer. Also, the other parameters affecting electrospinning of polymer solution were discussed. The results were demonstrated by extending the technique to PVP/dichloromethane (DCM) and PVP/ethanol (EtOH) systems. And the binary phase equilibrium of solvents (dichloromethane or ethanol) and N simulated by ASPEN PLUS 2006 demonstrates that N is not a 2good choice for producing hollow or po2rous polymer nanofibers.

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