期刊
PHYSICAL REVIEW E
卷 96, 期 3, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevE.96.032501
关键词
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资金
- National Key Research and Development Program of China [2016YFB0701302, 2014CB644003]
- National Natural Science Foundation of China [51671156, 51231008, IRT13034, 51321003, 51471125]
- US Natural Science Foundation [DMR-1410322]
- US Department of Energy [DE-SC0001258]
- U.S. Department of Energy (DOE) [DE-SC0001258] Funding Source: U.S. Department of Energy (DOE)
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1410322] Funding Source: National Science Foundation
Microstructural evolution during thermally induced phase separation in a polymer solution with a highly asymmetrical miscibility gap is analyzed using Flory-Huggins thermodynamics and nonlinear Cahn-Hilliard kinetics. Computer simulation results demonstrate that, in contrast to systems with symmetric miscibility gaps, interesting morphological-evolution pathways (MEPs) including cluster-to-percolation and percolation-to-cluster transitions are identified. These MEPs are rationalized according to asynchronous evolution of the two product phases. For a highly asymmetric polymer system, the initial solution composition is also found to play a critical role in determining the MEPs. According to the simulation results a map of MEPs in terms of initial solution composition and aging time of phase separation is established to guide future microstructural design in asymmetrical polymer solutions.
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