Asymmetric Molecular Dynamics and Anisotropic Phase Separation in the Cocrystal of the Crystalline/Crystalline Polymer Blend

2022 ◽  
pp. 193-198
Author(s):  
Ying Zheng ◽  
Navin Kafle ◽  
Derek Schwarz ◽  
James M. Eagan ◽  
Shigetaka Hayano ◽  
...  
Keyword(s):  
Molecular Dynamics ◽  
Phase Separation ◽  
Polymer Blend ◽  
Crystalline Polymer ◽  
Anisotropic Phase

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.

Phase equilibria in solutions of rod-like particles

1956 ◽  
Vol 234 (1196) ◽  
pp. 73-89 ◽  
Keyword(s):  
Free Energy ◽  
Phase Separation ◽  
Partition Function ◽  
Colloidal Particles ◽  
Double Layers ◽  
Positive Energy ◽  
Isotropic Phase ◽  
Electric Double Layers ◽  
Rigid Rod ◽  
Anisotropic Phase

A partition function for a system of rigid rod-like particles with partial orientation about an axis is derived through the use of a modified lattice model. In the limit of perfect orientation the partition function reduces to the ideal mixing law ; for complete disorientation it corresponds to the polymer mixing law for rigid chains. A general expression is given for the free energy of mixing as a function of the mole numbers, the axis ratio of the solute particles, and a disorientation parameter. This function passes through a minimum followed by a maximum with increase in the disorientation parameter, provided the latter exceeds a critical value which is 2e for the pure solute and which increases with dilution. Assigning this parameter the value which minimizes the free energy, the chemical potentials display discontinuities a t the concentration a t which the minimum first appears. Separation into an isotropic phase and a some what more concentrated anisotropic phase arises because of the discontinuity, in confirmation of the theories of Onsager and Isihara, which treat only the second virial coefficient. Phase separation thus arises as a consequence of particle asymmetry, unassisted by an energy term . Whereas for a large-particle asymmetry both phases in equilibrium are predicted to be fairly dilute when mixing is athermal, a comparatively small positive energy of interaction causes the concentration in the anisotropic phase to increase sharply, while the concentration in the isotropic phase becomes vanishingly small. The theory offers a statistical mechanical basis for interpreting precipitation of rod-like colloidal particles with the formation of fibrillar structures such as are prominent in the fibrous proteins. The asymmetry of tobacco mosaic virus particles (with or without inclusion of their electric double layers) is insufficient alone to explain the well-known phase separation which occurs from their dilute solutions at very low ionic strengths. Higher-order interaction between electric double layers appears to be a major factor in bringing about dilute phase separation for these and other asymmetric colloidal particles bearing large charges, as was pointed out previously by Oster.

Lasing actions from a liquid crystalline polymer blend

2001 ◽  
Vol 393 (1-2) ◽  
pp. 92-96 ◽  
Author(s):  
Tae-Woo Lee ◽  
O Ok Park ◽  
Hyun Nam Cho ◽  
Dong Young Kim ◽  
Chung Yup Kim ◽  
...  
Keyword(s):  
Polymer Blend ◽  
Liquid Crystalline Polymer ◽  
Liquid Crystalline ◽  
Crystalline Polymer

In-situ elastomer composite based on fluorocarbon elastomer/liquid crystalline polymer blend

2005 ◽  
Vol 11 (8-9) ◽  
pp. 657-672 ◽  
Author(s):  
E. Shivakumar ◽  
C. K. Das ◽  
K. N. Pandey ◽  
S. Alam ◽  
G. N. Mathur
Keyword(s):  
Polymer Blend ◽  
Liquid Crystalline Polymer ◽  
Liquid Crystalline ◽  
Crystalline Polymer

Effect of polymer donor aggregation on the active layer morphology of amorphous polymer acceptor-based all-polymer solar cells

2020 ◽  
Vol 8 (16) ◽  
pp. 5613-5619 ◽  
Author(s):  
Lu Zhang ◽  
Zicheng Ding ◽  
Ruyan Zhao ◽  
Feng Jirui ◽  
Wei Ma ◽  
...  
Keyword(s):  
Solar Cells ◽  
Phase Separation ◽  
Active Layer ◽  
Amorphous Polymer ◽  
Polymer Solar Cells ◽  
Crystalline Polymer ◽  
Dominant Factor ◽  
Polymer Acceptor ◽  
Aggregation Tendency

The aggregation tendency in solution of polymer donors is the dominant factor in the phase separation of semi-crystalline polymer donor/amorphous polymer acceptor blends in all-PSCs.

Mechanical confinement effects on the phase separation morphology of polymer blend thin films

1998 ◽  
Vol 57 (5) ◽  
pp. 5811-5817 ◽  
Author(s):  
K. Dalnoki-Veress ◽  
J. A. Forrest ◽  
J. R. Dutcher
Keyword(s):  
Thin Films ◽  
Phase Separation ◽  
Polymer Blend ◽  
Confinement Effects
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