Stratifying Polymer Solutions in Microsized Pores: Phase Transitions Induced by Deformation of a Porous Material

Features of the Influence of the Initial Composition of Organic Stratifying Mixtures in Microsized Pores on the Mutual Solubility of Components

“…The interest in the unique set of properties of small-volume multicomponent liquid phases (free or localized in the pore of droplets) is due to a wide range of their technological applications (spray technology [1], medical technologies [2,3], hybrid functional materials with liquid solutions in the pores of solid matrices [3][4][5][6], etc. ), as well as a number of phenomena of a fundamental nature [6][7][8][9][10] related to the peculiarities of phase and chemical transformations in micro-and nanoscale structures. Similar features are manifested in significant differences in the thermodynamic properties of the substance [11], the equilibrium composition and stability of the coexisting phases [7][8][9][12][13][14][15], temperatures and pressures of phase transitions [8,9,[12][13][14][15] in micro-and nanostructures from the corresponding characteristics of macrophases, as well as in specific dynamic effects [10,16].…”

“…), as well as a number of phenomena of a fundamental nature [6][7][8][9][10] related to the peculiarities of phase and chemical transformations in micro-and nanoscale structures. Similar features are manifested in significant differences in the thermodynamic properties of the substance [11], the equilibrium composition and stability of the coexisting phases [7][8][9][12][13][14][15], temperatures and pressures of phase transitions [8,9,[12][13][14][15] in micro-and nanostructures from the corresponding characteristics of macrophases, as well as in specific dynamic effects [10,16]. These differences depend on the volume, droplet shape [7][8][9] and a number of other factors.…”

“…Similar features are manifested in significant differences in the thermodynamic properties of the substance [11], the equilibrium composition and stability of the coexisting phases [7][8][9][12][13][14][15], temperatures and pressures of phase transitions [8,9,[12][13][14][15] in micro-and nanostructures from the corresponding characteristics of macrophases, as well as in specific dynamic effects [10,16]. These differences depend on the volume, droplet shape [7][8][9] and a number of other factors. It is further shown that the chemical composition of the mixture is among such factors.…”

“…The equilibrium composition of coexisting phases is determined by minimizing the Gibbs function taking into account the energy contribution of all interfaces (the basic equations of the model of phase separation of liquid and solid solutions in systems of a limited volume are given by us in [7-9, 14, 15]). The Gibbs function of the PBD-PS system is constructed in the framework of the Flory-Huggins model, and the water-phenol system is built in the framework of the NRTL model (model coefficients, as well as the parameters of the components of the systems under consideration, including methods for calculating the surface tensions of the external (shell) and internal (core-shell) the boundaries are given in [7,9], where the influence of the initial composition of the system was not considered).…”

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“…(in details, such approach and its variants have been described in [29][30][31][32], being applied to porous structures. In [33], some other geometry considerations could be found).…”