Process and Mechanism of Phase Separation in Polymer Mixtures with a Thermotropic Liquid Crystalline Copolyester as One Component

1996 ◽  
Vol 29 (18) ◽  
pp. 5990-6001 ◽  
Author(s):  
Akemi Nakai ◽  
Toshio Shiwaku ◽  
Wei Wang ◽  
Hirokazu Hasegawa ◽  
Takeji Hashimoto
Keyword(s):  
Phase Separation ◽  
Liquid Crystalline ◽  
Polymer Mixtures ◽  
Liquid Crystalline Copolyester

Phase-separated structures formed in polymer mixtures containing a thermotropic liquid crystalline copolyester as one component

Polymer ◽  
1996 ◽  
Vol 37 (11) ◽  
pp. 2259-2272 ◽  
Author(s):  
Akemi Nakai ◽  
Toshio Shiwaku ◽  
Wei Wang ◽  
Hirokazu Hasegawa ◽  
Takeji Hashimoto
Keyword(s):  
Liquid Crystalline ◽  
Polymer Mixtures ◽  
Liquid Crystalline Copolyester

Phase-Separated Structures in Polymer Mixtures with a Thermotropic Liquid Crystalline Copolyester as One Component:  Composition Dependence

1998 ◽  
Vol 31 (16) ◽  
pp. 5391-5398 ◽  
Author(s):  
Akemi Nakai ◽  
Wei Wang ◽  
Shigeru Ogasawara ◽  
Hirokazu Hasegawa ◽  
Takeji Hashimoto
Keyword(s):  
Liquid Crystalline ◽  
Composition Dependence ◽  
Component Composition ◽  
Polymer Mixtures ◽  
Liquid Crystalline Copolyester

Phase Separation in Liquid-Crystalline Copolymer/Poly(methyl methacrylate) Blends

1995 ◽  
Vol 60 (11) ◽  
pp. 1869-1874 ◽  
Author(s):  
Anatoly E. Nesterov ◽  
Yuri S. Lipatov ◽  
Vitaly V. Horichko
Keyword(s):  
Phase Separation ◽  
Methyl Methacrylate ◽  
Liquid Crystalline Polymer ◽  
Liquid Crystalline ◽  
Ethylene Terephthalate ◽  
Crystalline Polymer ◽  
Scattering Method ◽  
Thermally Induced ◽  
Poly Methyl Methacrylate ◽  
Copolymer Poly

The phase separation in the blends of poly(methyl methacrylate) and liquid-crystalline polymer (copolymer of ethylene terephthalate and p-hydroxybenzoic acid) has been studied by the light scattering method and the cloud point curves have been obtained. Simultaneously some morphological features of the blends have been observed. It was found that the initial blends are in the state of forced compatibility and that thermally induced phase separation occurs by the mechanism of spinodal decomposition but presumably in the non-linear regime.

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.

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