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Abstract
In this paper, the concept of the functional mechanism of copolymer membrane formation is explained and analyzed from the theoretical and experimental points of view. To understand the phase inversion process and control the final membrane morphology, styrene-acrylonitrile copolymer (SAN) membrane morphology through the self-assembly phenomena is investigated. Since the analysis of the membrane morphology requires the study of both thermodynamic and kinetic parameters, the effect of different membrane formation conditions is investigated experimentally; In order to perceive the formation mechanism of the extraordinary structure membrane, a thermodynamic hypothesis is also developed based on the hydrophilic coil migration to the membrane surface. This hypothesis is analyzed according to Hansen Solubility Parameters and proved using EDX, SAXS, and contact angle analysis of SAN25. Moreover, the SAN30 membrane is fabricated under different operating conditions to evaluate the possibility of morphological prediction based on the developed hypothesis.
Highlights
In this paper, the concept of the functional mechanism of copolymer membrane formation is explained and analyzed from the theoretical and experimental points of view
We have presented a successful approach to wipe out this challenge by thermodynamic investigation via Hansen Solubility Parameters (HSP) in order to explicate the molecular mechanism of membrane formation
Micropores with identical pore sizes, which are the consequence of the non-solvent Induced Phase Separation (NIPS) process, are scattered on the whole surface of the membrane, and their structure is comparable to membranes prepared using other polymers
Summary
The concept of the functional mechanism of copolymer membrane formation is explained and analyzed from the theoretical and experimental points of view. Since the analysis of the membrane morphology requires the study of both thermodynamic and kinetic parameters, the effect of different membrane formation conditions is investigated experimentally; In order to perceive the formation mechanism of the extraordinary structure membrane, a thermodynamic hypothesis is developed based on the hydrophilic coil migration to the membrane surface. This hypothesis is analyzed according to Hansen Solubility Parameters and proved using EDX, SAXS, and contact angle analysis of SAN25. The final morphology depends on the materials and on the process and preparation conditions intensively, which can prove the effectual role of thermodynamic and kinetic landscapes in the self-assembly process for structure design and process c ontrol[27,28]
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