Stabilizing the Frank-Kasper Phases via Binary Blends of AB Diblock Copolymers
| Autor: | Feng Qiu, Meijiao Liu, Weihua Li, An-Chang Shi, Yicheng Qiang |
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| Rok vydání: | 2016 |
| Předmět: |
Materials science
Polymers and Plastics Organic Chemistry Binary number 02 engineering and technology Frank Kasper phases 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Inorganic Chemistry Crystallography Chemical physics Phase (matter) Phase space Materials Chemistry Copolymer Soft matter A15 phases 0210 nano-technology Phase diagram |
| Zdroj: | ACS Macro Letters. 5:1167-1171 |
| ISSN: | 2161-1653 |
| DOI: | 10.1021/acsmacrolett.6b00685 |
| Popis: | The emergence of the complex Frank-Kasper phases from binary mixtures of AB diblock copolymers is studied using the self-consistent field theory. The relative stability of different ordered phases, including the Frank-Kasper σ and A15 phases containing nonspherical minority domains with different sizes, is examined by a comparison of their free energy. The resulting phase diagrams reveal that the σ phase occupies a large region in the phase space of the system. The formation mechanism of the σ phase is elucidated by the distribution of the two diblock copolymers with different lengths and compositions. In particular, the segregation of the two types of copolymers, occurring among different domains and within each domain, provides a mechanism to regulate the size and shape of the minority domains, thus enhancing the stability of the Frank-Kasper phases. These findings provide insight into understanding the formation of the Frank-Kasper phases in soft matter systems and a simple route to obtain complex orde... |
| Databáze: | OpenAIRE |
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