Early stages of phase separation from polydisperse polymer mixtures

2001 ◽  
Vol 4 (3) ◽  
pp. 327-336 ◽  
Author(s):  
N. Clarke
Keyword(s):  
Phase Separation ◽  
Polymer Mixtures ◽  
Early Stages ◽  
Polydisperse Polymer

Kinetics of phase separation in polydisperse polymer mixtures

1987 ◽  
Vol 20 (7) ◽  
pp. 1671-1681 ◽  
Author(s):  
T. E. Schichtel ◽  
K. Binder
Keyword(s):  
Phase Separation ◽  
Polymer Mixtures ◽  
Polydisperse Polymer ◽  
Kinetics Of

The Early Stages of the Phase Separation Dynamics in Polydisperse Polymer Blends

1994 ◽  
Vol 27 (15) ◽  
pp. 4231-4241 ◽  
Author(s):  
C. Huang ◽  
M. Olvera de la Cruz
Keyword(s):  
Phase Separation ◽  
Polymer Blends ◽  
Early Stages ◽  
Polydisperse Polymer

scholarly journals On the Role of Poly-Glutamic Acid in the Early Stages of Iron(III) (Oxy)(hydr)oxide Formation

Minerals ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 715
Author(s):  
Miodrag J. Lukić ◽  
Felix Lücke ◽  
Teodora Ilić ◽  
Katharina Petrović ◽  
Denis Gebauer
Keyword(s):  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Phase Separation ◽  
Fourier Transform Infrared Spectroscopy ◽  
Fourier Transform Infrared ◽  
Nucleation Theory ◽  
Classical Nucleation Theory ◽  
Oxide Formation ◽  
Early Stages ◽  
Titration Assay

Nucleation of minerals in the presence of additives is critical for achieving control over the formation of solids in biomineralization processes or during syntheses of advanced hybrid materials. Herein, we investigated the early stages of Fe(III) (oxy)(hydr)oxide formation with/without polyglutamic acid (pGlu) at low driving force for phase separation (pH 2.0 to 3.0). We employed an advanced pH-constant titration assay, X-ray diffraction, thermal analysis with mass spectrometry, Fourier Transform infrared spectroscopy, and scanning electron microscopy. Three stages were observed: initial binding, stabilization of Fe(III) pre-nucleation clusters (PNCs), and phase separation, yielding Fe(III) (oxy)(hydr)oxide. The data suggest that organic–inorganic interactions occurred via binding of olation Fe(III) PNC species. Fourier Transform Infrared Spectroscopy (FTIR) analyses revealed a plausible interaction motif and a conformational adaptation of the polypeptide. The stabilization of the aqueous Fe(III) system against nucleation by pGlu contrasts with the previously reported influence of poly-aspartic acid (pAsp). While this is difficult to explain based on classical nucleation theory, alternative notions such as the so-called PNC pathway provide a possible rationale. Developing a nucleation theory that successfully explains and predicts distinct influences for chemically similar additives like pAsp and pGlu is the Holy Grail toward advancing the knowledge of nucleation, early growth, and structure formation.

scholarly journals Oxidation of polycrystalline Ni studied by spectromicroscopy: Phase separation in the early stages of crystallite growth

2010 ◽  
Vol 81 (8) ◽  
Author(s):  
A. Cornish ◽  
T. Eralp ◽  
A. Shavorskiy ◽  
R. A. Bennett ◽  
G. Held ◽  
...  
Keyword(s):  
Phase Separation ◽  
Crystallite Growth ◽  
Early Stages

scholarly journals Gelation Impairs Phase Separation and Small Molecule Migration in Polymer Mixtures

Polymers ◽  
2020 ◽  
Vol 12 (7) ◽  
pp. 1576
Author(s):  
Biswaroop Mukherjee ◽  
Buddhapriya Chakrabarti
Keyword(s):  
Phase Separation ◽  
Rational Design ◽  
Surface Segregation ◽  
Multiscale Methods ◽  
Coarse Grained ◽  
Polymer Gel ◽  
Polymer Mixtures ◽  
Separation Processes ◽  
Surface Migration ◽  
Wide Range

Surface segregation of the low molecular weight component of a polymeric mixture is a ubiquitous phenomenon that leads to degradation of industrial formulations. We report a simultaneous phase separation and surface migration phenomena in oligomer–polymer ( O P ) and oligomer–gel ( O G ) systems following a temperature quench that induces demixing of components. We compute equilibrium and time varying migrant (oligomer) density profiles and wetting layer thickness in these systems using coarse grained molecular dynamics (CGMD) and mesoscale hydrodynamics (MH) simulations. Such multiscale methods quantitatively describe the phenomena over a wide range of length and time scales. We show that surface migration in gel–oligomer systems is significantly reduced on account of network elasticity. Furthermore, the phase separation processes are significantly slowed in gels leading to the modification of the well known Lifshitz–Slyozov–Wagner (LSW) law ℓ ( τ ) ∼ τ 1 / 3 . Our work allows for rational design of polymer/gel–oligomer mixtures with predictable surface segregation characteristics that can be compared against experiments.

Early stages ofα−α′phase separation in Fe-Cr alloys: An atomistic study

2009 ◽  
Vol 79 (10) ◽  
Author(s):  
G. Bonny ◽  
D. Terentyev ◽  
L. Malerba ◽  
D. Van Neck
Keyword(s):  
Phase Separation ◽  
Early Stages ◽  
Α Phase ◽  
Atomistic Study

Phase separation during the early stages of ordering in Mi3Mo

1988 ◽  
Vol 36 (2) ◽  
pp. 413-424 ◽  
Author(s):  
U.D. Kulkarni ◽  
S. Banerjee
Keyword(s):  
Phase Separation ◽  
Early Stages

Phase separation of symmetric polymer mixtures in a common good solvent in the semidilute concentration regime

1994 ◽  
Vol 272 (11) ◽  
pp. 1474-1485 ◽  
Author(s):  
A Sariban ◽  
K. Binder
Keyword(s):  
Phase Separation ◽  
Common Good ◽  
Polymer Mixtures

Viscoelastic Effects on the Early Stages of Phase Separation in Polymer Blends

1997 ◽  
Vol 30 (15) ◽  
pp. 4459-4463 ◽  
Author(s):  
N. Clarke ◽  
T. C. B. McLeish ◽  
S. Pavawongsak ◽  
J. S. Higgins
Keyword(s):  
Phase Separation ◽  
Polymer Blends ◽  
Early Stages ◽  
Viscoelastic Effects
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