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- W2000488058 abstract "The phenomenological analysis of the thermal inversion membrane formation through spinodal decomposition was further developed to include enthalpic and entropic contributions to the Flory-Huggins interaction parameter. We found that material and processing conditions can be lumped into two parameters. One is the Deborah Number, De, which takes into account the thermal quenching relative to the phase separation induction time. The other one, designated as an ε-parameter, takes into account the quenching temperature relative to the spinodal temperature and the ratio of the enthalpic to the entropic contributions to the Flory-Huggins interaction parameter. From the model system, we found that the dimensionless interdomain distance, δ, as a function of 1/De (which is proportional to the cooling rate) falls in a relatively narrow banded region for all practical values of ε. As 1/De approaches infinity, δ is asymptotic up to maximum value of 3.5. This means that membranes made under applicable conditions will have a ratio of pore sizes of no more than 3.5. Other assumptions of the model are: (1) the mobility is temperature-independent; (2) the mutual diffusivity is a linear function of temperature; and (3) the thermal history (Temperature vs. Time), can be represented as two successive linear functions." @default.
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- W2000488058 date "1991-11-01" @default.
- W2000488058 modified "2023-10-18" @default.
- W2000488058 title "Analysis of polymer membrane formation through spinodal decomposition. II: Effect of Flory-Huggins enthalpic and entropic contributions" @default.
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- W2000488058 doi "https://doi.org/10.1002/pen.760312207" @default.
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