Viscoelastic phase separation model for ternary polymer solutions

Yoshimoto, Kenji; Taniguchi, Takashi

doi:10.1063/5.0039208

Cited by 10 publications

(8 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The latter aspect is most important because many different nonequilibrium processes such as, e.g., solvent evaporation from a thin film, ,,,,,,, diffusive solvent–nonsolvent exchange, ,,− macro- and microphase separation, ,, structure formation in the presence of property gradients ,,, or moving fronts, ,,, hydrodynamic flow, ,, effects of viscoelasticity, ,,, and dynamic arrest due to vitrification, crystallization, or gelation conspire in polymer membrane formation, and the thermodynamic and processing variables span a high-dimensional parameter space that dictates the final nonequilibrium structure. As we have tried to illustrate with the help of selected examples, there has been much progress in each of the individual aspects; however, understanding and predicting their interplay in the course of process-directed macro- and microphase separation during NIPS remains a challenge.…”

Section: Discussionmentioning

confidence: 99%

“…This viscoelastic model has recently been generalized to ternary mixtures of polymer, solvent, and nonsolvent. 287 An alternative strategy to account for the slowing down of the kinetics of structure formation in regions of high polymer density consists of employing density-dependent Onsager coefficients. Tree and co-workers 206 employed this technique to model the dynamic arrest upon increase of the polymer density.…”

Section: Particle Simulationsmentioning

confidence: 99%

“…Such a gel-like morphology is rather typical for membranes formed by NIPS. This viscoelastic model has recently been generalized to ternary mixtures of polymer, solvent, and nonsolvent …”

Section: Homopolymer Membranesmentioning

confidence: 99%

See 2 more Smart Citations

Nonequilibrium Processes in Polymer Membrane Formation: Theory and Experiment

Müller

Abetz

2021

Chem. Rev.

View full text Add to dashboard Cite

Porous polymer and copolymer membranes are useful for ultrafiltration of functional macromolecules, colloids, and water purification. In particular, block copolymer membranes offer a bottom-up approach to form isoporous membranes. To optimize permeability, selectivity, longevity, and cost, and to rationally design fabrication processes, direct insights into the spatiotemporal structure evolution are necessary. Because of a multitude of nonequilibrium processes in polymer membrane formation, theoretical predictions via continuum models and particle simulations remain a challenge. We compiled experimental observations and theoretical approaches for homo- and block copolymer membranes prepared by nonsolvent-induced phase separation and highlight the interplay of multiple nonequilibrium processesevaporation, solvent–nonsolvent exchange, diffusion, hydrodynamic flow, viscoelasticity, macro- and microphase separation, and dynamic arrestthat dictates the complex structure of the membrane on different scales.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Particle Simulationsmentioning

confidence: 99%

See 1 more Smart Citation

Nonequilibrium Processes in Polymer Membrane Formation: Theory and Experiment

Müller

Abetz

2021

Chem. Rev.

View full text Add to dashboard Cite

show abstract

“…The structures both inside and on the surface of the film are very important to obtain cooling and superhydrophobic properties. In the preparation process, a phase separation method − was adopted to adjust the microstructure of the film. It was found that the ratio of S to EB in SEBS influenced greatly the morphology of the SEBS film, although they have the same chemical structures (Figure S1).…”

Section: Resultsmentioning

confidence: 99%

A Superhydrophobic Dual-Mode Film for Energy-Free Radiative Cooling and Solar Heating

et al. 2022

View full text Add to dashboard Cite

Traditional electric cooling in summer and coal heating in winter consume a huge amount of energy and lead to a greenhouse effect. Herein, we developed an energy-free dual-mode superhydrophobic film, which consists of a white side with porous coating of styrene-ethylene-butylene-styrene/SiO 2 for radiative cooling and a black side with nanocomposite coating of carbon nanotubes/polydimethylsiloxane for solar heating. In the cooling mode with the white side, the film achieved a high sunlight reflection of 94% and a strong long-wave infrared emission of 92% in the range of 8–13 μm to contribute to a temperature drop of ∼11 °C. In the heating mode with the black side, the film achieved a high solar absorption of 98% to induce heating to raise the air temperature beneath by Δ T of ∼35.6 °C. Importantly, both sides of the film are superhydrophobic with a contact angle over 165° and a sliding angle near 0°, showing typical self-cleaning effects, which defend the surfaces from outdoor contamination, thus conducive to long-term cooling and heating. This dual-mode film shows great potential in outdoor applications as coverings for both cooling in hot summer and heating in winter without an energy input.

show abstract

“…Phase separation of polymer blends and solutions have been a subject of intensive investigations for basic understanding and various applications. − Polymers with long chains show a strong segregation trend to form incompatible phases, easily causing the initial homogeneous state to separate into the coexisting phases, which could lead to the feasible fabrication of multiphase particles through phase separation. Microphase separation in the dispersed solvent droplets has been developed to prepare JPs in previous studies. − The JPs with “snowman-like” and other morphologies were obtained by using polymers such as polystyrene (PS) and poly(methyl methacrylate) (PMMA) in toluene droplets, dispersed in aqueous solution with a nonionic surfactant at thermodynamic equilibrium.…”

Section: Introductionmentioning

confidence: 99%

Triphasic Polymer Particles Assembled via Microphase Separation with Multiple Functions

Liao

Wang

2021

Langmuir

View full text Add to dashboard Cite

This work investigated a unique type of triphasic colloidal particles composed of an azo polymer (PCNAZO), a fluorescent pyrene-containing polymer [P(MMA-co-PyMA)], and a poly(dimethylsiloxane)-based polymer (H 2 pdca-PDMS), focusing on the synthesis, forming mechanism, morphology control, and functions. The triphasic particles with well-defined morphologies were assembled through the microphase separation of the components in dichloromethane (DCM) droplets in an aqueous medium, induced by the gradual evaporation of the organic solvent. The real-time fluorescence emission spectra of the pyrenyl moieties and in situ microscopic observations show that the formation of the triphasic particles undergoes the segregation of the PCNAZO-rich phase, separation between P(MMA-co-PyMA)-rich and H 2 pdca-PDMS-rich phases, coalescence, and solidification in the dispersed droplets. The structure formation is due to the strong phase separation of the polymers as revealed by the calculations based on the Flory−Huggins theory. The morphologies and phase boundaries of the particles are found to be controlled by the interfacial energy between the phases and processing conditions. The triphasic particles thus obtained possess a series of interesting functions stemming from the polymers and the triple-compartmentalized structures. After being deposited on a substrate, the H 2 pdca-PDMS parts can tightly adhere on the surface, caused by the spreading nature of the polymer when slightly swelled by DCM. Upon irradiation with a linearly polarized laser beam at 488 nm, the azo polymer compartments show a significant elongation along the electric vibration direction of the polarized light, accompanied by the cooperative deformation of the H 2 pdca-PDMS pads. When dispersed in water and adhered on the substrate surface, the triphasic particles exhibit tunable colors originating from the fluorescence of the pyrenyl fluorophores and light absorption of the azo chromophores. The real-time investigation methods developed here could lead to the deep understanding of the structure formation process in the confined volume and be applied in phase-separation study of other polymers as well.

show abstract

Viscoelastic phase separation model for ternary polymer solutions

Cited by 10 publications

References 28 publications

Nonequilibrium Processes in Polymer Membrane Formation: Theory and Experiment

Nonequilibrium Processes in Polymer Membrane Formation: Theory and Experiment

A Superhydrophobic Dual-Mode Film for Energy-Free Radiative Cooling and Solar Heating

Triphasic Polymer Particles Assembled via Microphase Separation with Multiple Functions

Contact Info

Product

Resources

About