التفاصيل البيبلوغرافية
| العنوان: |
Bicontinuous microemulsion in binary blends of complementary diblock copolymers. |
| المؤلفون: |
Willis, J. D., Matsen, M. W. |
| المصدر: |
Journal of Chemical Physics; 1/14/2024, Vol. 160 Issue 2, p1-13, 13p |
| مصطلحات موضوعية: |
DIBLOCK copolymers, SELF-consistent field theory, POLYMER blends, MICROEMULSIONS |
| مستخلص: |
The phase behavior of binary blends of AB diblock copolymers of compositions f and 1 − f is examined using field-theoretic simulations. Highly asymmetric compositions (i.e., f ≈ 0) behave like homopolymer blends macrophase separating into coexisting A- and B-rich phases as the segregation is increased, whereas more symmetric diblocks (i.e., f ≈ 0.5) microphase separate into an ordered lamellar phase. In self-consistent field theory, these behaviors are separated by a Lifshitz critical point at f = 0.2113. However, its lower critical dimension is believed to be four, which implies that the Lifshitz point should be destroyed by fluctuations. Consistent with this, it is found to transform into a tricritical point. Furthermore, the highly swollen lamellar phase near the mean-field Lifshitz point disorders into a bicontinuous microemulsion (BμE), consisting of large interpenetrating A- and B-rich microdomains. BμE has been previously reported in ternary blends of AB diblock copolymer with its parent A- and B-type homopolymers, but in that system the homopolymers have a tendency to macrophase separate. Our alternative system for creating BμE is free of this macrophase separation. [ABSTRACT FROM AUTHOR] |
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| قاعدة البيانات: |
Complementary Index |
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