Experimental phase diagram for the PVDF – DMAc– water ternary system with new topology: Method of construction, thermodynamics, and structure formation of membranes

Pochivalov, K. V.; Basko, Andrey V.; Ilyasova, Anna N.; Lebedeva, T. N.; Yurov, Mikhail Yu.; Bronnikov, Sergei

doi:10.1016/j.polymer.2023.126152

Cited by 2 publications

(8 citation statements)

References 116 publications

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“…Figure 1a shows the phase diagram for the PVDF-DMAc-water ternary mixture at 60 • C, which we were able to plot in our previous work [52]. In this phase diagram, the AEB curve is the liquid equilibrium binodal.…”

Section: Themodynamic Discourse Of the Membranes Structure Formation ...mentioning

confidence: 86%

“…DMAc ("Componentreactive", Ltd., Moscow, Russia) with a refractive index of 1.435 and density of 0.940 g cm −3 was used as a solvent. The listed characteristics of the polymer and the solvent were determined in our previous paper [52]. Distilled water was used as a nonsolvent.…”

Section: Methodsmentioning

confidence: 99%

“…The topology of any ternary phase diagram is dependent on temperature. We used the data reported in [52] to plot the phase diagram for this mixture at 25 • C (Figure 1b). The position of the ABC curve was obtained by graphical interpolation and points on the BD curve were determined as compositions of the mixture in the intersection points of isotherm at 25 • C, with curves in the temperature-composition phase diagrams for the quasibinary mixtures of PVDF and cosolvents of various compositions.…”

Section: Themodynamic Discourse Of the Membranes Structure Formation ...mentioning

confidence: 99%

“…For example, to describe the mechanism of the so-called finger-like pores' (FLPs) formation, several approaches, such as the coalescence of the smaller droplets [44][45][46] and the morphological instability of the interface between two liquids (viscous fingering) [37,[47][48][49], were proposed. In our recent papers [50][51][52], we assumed that the reason for the initiation and growth of FLP is the nonuniformity of the rate of nonsolvent diffusion through the matrix and open pores in the skin layer.…”

Section: Introductionmentioning

confidence: 99%

“…Recently, we [52] plotted, for the first time, a complete experimental phase diagram for tmembrane preparation via the widely used NIPS mixture of PVDF, DMAc and water. The plotted diagram and thermal behavior data from this paper were used for a discussion of the results obtained in this work.…”

Section: Introductionmentioning

confidence: 99%

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Mechanism of PVDF Membrane Formation by NIPS Revisited: Effect of Precipitation Bath Nature and Polymer–Solvent Affinity

Basko,

Lebedeva,

Yurov

et al. 2023

Polymers

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A new interpretation of the mechanism of the polyvinylidene fluoride (PVDF) membrane formation using the nonsolvent-induced phase separation (NIPS) method based on an analysis of the complete experimental phase diagram for the three-component mixture PVDF–dimethyl acetamide (DMAc)–water is proposed. The effects of the precipitation bath’s harshness and thermodynamic affinity of the polymer’s solvent on the morphology, crystalline structure, transport and physical–mechanical properties of the membranes are investigated. These characteristics were studied via scanning electron microscopy, wide-angle X-ray scattering, liquid–liquid porosimetry and standard methods of physico-mechanical analysis. It is established that an increase in DMAc concentration in the precipitation bath results in the growth of mean pore size from ~60 to ~150 nm and an increase in permeance from ~2.8 to ~8 L m−2 h−1 bar−1. It was observed that pore size transformations are accompanied by changes in the tensile strength of membranes from ~9 to ~11 and to 6 MPa, which were explained by the degeneration of finger-like pores and appearance of spherulitic structures in the samples. The addition of water to the dope solution decreased both the transport (mean pore size changed from ~55 to ~25 nm and permeance reduced from ~2.8 to ~0.5 L m−2 h−1 bar−1) and mechanical properties of the membranes (tensile strength decreased from ~9 to ~6 MPa). It is possible to conclude that the best membrane quality may be reached using pure DMAc as a solvent and a precipitation bath containing 10–30% wt. of DMAc, in addition to water.

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Section: Themodynamic Discourse Of the Membranes Structure Formation ...mentioning

confidence: 86%

Section: Methodsmentioning

confidence: 99%

Section: Themodynamic Discourse Of the Membranes Structure Formation ...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Mechanism of PVDF Membrane Formation by NIPS Revisited: Effect of Precipitation Bath Nature and Polymer–Solvent Affinity

Basko,

Lebedeva,

Yurov

et al. 2023

Polymers

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Polypropylene membranes prepared via non-solvent/thermally induced phase separation: Effect of non-solvent nature

Pochivalov,

Basko,

Yurov

et al. 2024

Journal of Membrane Science

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Experimental phase diagram for the PVDF – DMAc– water ternary system with new topology: Method of construction, thermodynamics, and structure formation of membranes

Cited by 2 publications

References 116 publications

Mechanism of PVDF Membrane Formation by NIPS Revisited: Effect of Precipitation Bath Nature and Polymer–Solvent Affinity

Mechanism of PVDF Membrane Formation by NIPS Revisited: Effect of Precipitation Bath Nature and Polymer–Solvent Affinity

Polypropylene membranes prepared via non-solvent/thermally induced phase separation: Effect of non-solvent nature

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