scholarly journals Visualized Polymers. Patterns Formed by Polymeric Systems. II. Anisotropic Phase Separation of Polymer Blends Induced by Polarization-Selective Reactions: Morphology and Emergence Mechanism.

1999 ◽  
Vol 56 (12) ◽  
pp. 753-761 ◽  
Author(s):  
Qui TRAN-CONG-MIYATA ◽  
Katsunari KATAOKA ◽  
Kouichi ENDOH
Keyword(s):  
Phase Separation ◽  
Polymer Blends ◽  
Polymeric Systems ◽  
Anisotropic Phase

scholarly journals Phase Separation and Pattern Formation in Polymer Blends.

Kobunshi ◽  
1992 ◽  
Vol 41 (11) ◽  
pp. 790-793
Author(s):  
Hajime Tanaka
Keyword(s):  
Phase Separation ◽  
Pattern Formation ◽  
Polymer Blends

scholarly journals Mechanical and Morphological Properties of Bio-Phenolic/Epoxy Polymer Blends

Molecules ◽  
2021 ◽  
Vol 26 (4) ◽  
pp. 773
Author(s):  
Ahmad Safwan Ismail ◽  
Mohammad Jawaid ◽  
Norul Hisham Hamid ◽  
Ridwan Yahaya ◽  
Azman Hassan
Keyword(s):  
Mechanical Properties ◽  
Phase Separation ◽  
Polymer Blends ◽  
Epoxy Polymer ◽  
Flexural Modulus ◽  
Polymeric Materials ◽  
Morphological Properties ◽  
Comparison Results ◽  
Unique Material ◽  
Different Types

Polymer blends is a well-established and suitable method to produced new polymeric materials as compared to synthesis of a new polymer. The combination of two different types of polymers will produce a new and unique material, which has the attribute of both polymers. The aim of this work is to analyze mechanical and morphological properties of bio-phenolic/epoxy polymer blends to find the best formulation for future study. Bio-phenolic/epoxy polymer blends were fabricated using the hand lay-up method at different loading of bio-phenolic (5 wt%, 10 wt%, 15 wt%, 20 wt%, and 25 wt%) in the epoxy matrix whereas neat bio-phenolic and epoxy samples were also fabricated for comparison. Results indicated that mechanical properties were improved for bio-phenolic/epoxy polymer blends compared to neat epoxy and phenolic. In addition, there is no sign of phase separation in polymer blends. The highest tensile, flexural, and impact strength was shown by P-20(biophenolic-20 wt% and Epoxy-80 wt%) whereas P-25 (biophenolic-25 wt% and Epoxy-75 wt%) has the highest tensile and flexural modulus. Based on the finding, it is concluded that P-20 shows better overall mechanical properties among the polymer blends. Based on this finding, the bio-phenolic/epoxy blend with 20 wt% will be used for further study on flax-reinforced bio-phenolic/epoxy polymer blends.

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.

Phase separation of polymer blends under shear field

1996 ◽  
Vol 101 (1) ◽  
pp. 157-165 ◽  
Author(s):  
Charles C. Han
Keyword(s):  
Phase Separation ◽  
Polymer Blends ◽  
Shear Field

Morphology control in symmetric polymer blends using two-step phase separation

2006 ◽  
Vol 37 (3) ◽  
pp. 328-335 ◽  
Author(s):  
Tuyet L. Tran ◽  
Philip K. Chan ◽  
Derick Rousseau
Keyword(s):  
Phase Separation ◽  
Polymer Blends ◽  
Morphology Control

Monte Carlo study of phase separation in critical polymer blends

1993 ◽  
Vol 48 (5) ◽  
pp. 3705-3711 ◽  
Author(s):  
Gregory Brown ◽  
Amitabha Chakrabarti
Keyword(s):  
Monte Carlo ◽  
Phase Separation ◽  
Polymer Blends ◽  
Monte Carlo Study
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