Multicomponent diffusion in phase-separating polymer blends with different frictional interactions: a mean-friction model |
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Authors: | Masato Yamamura Toshihisa Kajiwara Hiroyuki Kage |
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Affiliation: | Department of Applied Chemistry, Kyushu Institute of Technology, Fukuoka, 804-8550, Japan |
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Abstract: | We present a compact formula for describing the mean frictional forces acting on a molecule in multicomponent systems. The friction-based diffusion theory of Zielinski and Hanley was extended to newly include the friction-average molar velocity as a reference frame. The results showed that the previous diffusion theories are unified by the friction-average concept by properly choosing the average velocity. The present model based on the diffusivity-related molar average velocity provides better predictions for the diffusive flux in a ternary miscible liquid compared to the other existing theories. The application of the model in phase-separating ternary systems revealed that the introduction of a highly diffusive third component into demixing polymer blends promotes a particular enhancement of the spinodal decomposition due to the difference in the frictional interactions between polymers. |
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Keywords: | Multicomponent diffusion Friction force Polymers Microstructure Complex fluids Phase separation |
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