The perfluoropolymer upper bound

Wu, Albert X.; Drayton, James A.; Smith, Zachary P.

doi:10.1002/aic.16700

Cited by 58 publications

(49 citation statements)

References 51 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This trade‐off was empirically defined for a large database by Robeson in 1991 [8] and later revised to include more data points in 2008 [9] . Newer upper bounds have been defined, [10–12] but the Robeson plots remain the most common benchmark comparison. These plots serve as a soft metric to benchmark pure‐gas separation performance across polymer classes (i.e., rubbery and glassy) and chemistries (e.g., backbone and/or side‐chain composition).…”

Section: Introductionmentioning

confidence: 99%

Leveraging Free Volume Manipulation to Improve the Membrane Separation Performance of Amine‐Functionalized PIM‐1

Rodriguez

Lin

et al. 2021

Angew Chem Int Ed

Self Cite

View full text Add to dashboard Cite

Gas‐separation polymer membranes display a characteristic permeability–selectivity trade‐off that has limited their industrial use. The most comprehensive approach to improving performance is to devise strategies that simultaneously increase fractional free volume, narrow free volume distribution, and enhance sorption selectivity, but generalizable methods for such approaches are exceedingly rare. Here, we present an in situ crosslinking and solid‐state deprotection method to access previously inaccessible sorption and diffusion characteristics in amine‐functionalized polymers of intrinsic microporosity. Free volume element (FVE) size can be increased while preserving a narrow FVE distribution, enabling below‐upper bound polymers to surpass the H2/N2, H2/CH4, and O2/N2 upper bounds and improving CO2‐based selectivities by 200 %. This approach can transform polymers into chemical analogues with improved performance, thereby overcoming traditional permeability–selectivity trade‐offs.

show abstract

Section: Introductionmentioning

confidence: 99%

Leveraging Free Volume Manipulation to Improve the Membrane Separation Performance of Amine‐Functionalized PIM‐1

Rodriguez

Lin

et al. 2021

Angew Chem Int Ed

Self Cite

View full text Add to dashboard Cite

show abstract

“…MMMs that contain these filler materials, their merits and limitations, as well as effects on the membrane performances for hydrogen separation. [56][57][58]. Reprinted with permission from ref.…”

Section: Hydrogen Purification: Membrane Vs Other Technologiesmentioning

confidence: 99%

“…Robeson plot showing the present (2008) and prior (1991) upper bound for (a) H2/CO2, (b) H2/CH4, and (c) H2/N2 gas pairs. Additional line in brown represents the most well-received upper bounds based on up-to-date profiles obtained from the following references[56][57][58]. Reprinted with permission from ref [17]…”

mentioning

confidence: 99%

Recent Progress in Mixed-Matrix Membranes for Hydrogen Separation

et al. 2021

View full text Add to dashboard Cite

Membrane separation is a compelling technology for hydrogen separation. Among the different types of membranes used to date, the mixed-matrix membranes (MMMs) are one of the most widely used approaches for enhancing separation performances and surpassing the Robeson upper bound limits for polymeric membranes. In this review, we focus on the recent progress in MMMs for hydrogen separation. The discussion first starts with a background introduction of the current hydrogen generation technologies, followed by a comparison between the membrane technology and other hydrogen purification technologies. Thereafter, state-of-the-art MMMs, comprising emerging filler materials that include zeolites, metal-organic frameworks, covalent organic frameworks, and graphene-based materials, are highlighted. The binary filler strategy, which uses two filler materials to create synergistic enhancements in MMMs, is also described. A critical evaluation on the performances of the MMMs is then considered in context, before we conclude with our perspectives on how MMMs for hydrogen separation can advance moving forward.

show abstract

“…This phenomenon can be explained by an increase in interactions between the macromolecular chains due to the formation of polar -CH 2 -CHF-CHF-, -CH 2 -CHF-CF 2 -, -CH 2 -CHF-CH 2 - and similar chemical structures that should limit the diffusion of nonpolar penetrants (for instance, see [ 112 ]). An additional factor that may be responsible for the permeability drop can be lower solubility of hydrocarbon penetrants, compared to their perfluorinated analogues, in highly fluorinated substances [ 13 , 17 , 113 , 114 , 115 ]. Meanwhile, the transport of polar vapors, including water, is slightly changed after the fluorination: the water permeability increases or it is almost independent from the fluorination conditions [ 87 , 111 ].…”

Section: Vapor and Liquid Permeation And Related Processesmentioning

confidence: 99%

Effect of Direct Fluorination on the Transport Properties and Swelling of Polymeric Materials: A Review

et al. 2021

View full text Add to dashboard Cite

Fluorine-containing polymers occupy a peculiar niche among conventional polymers due to the unique combination of physicochemical properties. Direct surface fluorination of the polymeric materials is one of the approaches for the introduction of fluorine into the chemical structure that allows one to implement advantages of fluorinated polymers in a thin layer. Current review considers the influence of the surface interaction of the polymeric materials and membranes with elemental fluorine on gas, vapor and liquid transport as well as swelling and related phenomena. The increase in direct fluorination duration and concentration of fluorine in the fluorination mixture is shown to result mostly in a reduction of all penetrants permeability to a different extent, whereas selectivity of the selected gas pairs (He-H2, H2-CH4, He-CH4, CO2-CH4, O2-N2, etc.) increases. Separation parameters for the treated polymeric films approach Robeson’s upper bounds or overcome them. The most promising results were obtained for highly permeable polymer, polytrimethylsilylpropyne (PTMSP). The surface fluorination of rubbers in printing equipment leads to an improved chemical resistance of the materials towards organic solvents, moisturizing solutions and reduce diffusion of plasticizers, photosensitizers and other components of the polymeric blends. The direct fluorination technique can be also considered one of the approaches of fabrication of fuel cell membranes from non-fluorinated polymeric precursors that improves their methanol permeability, proton conductivity and oxidative stability.

show abstract

The perfluoropolymer upper bound

Cited by 58 publications

References 51 publications

Leveraging Free Volume Manipulation to Improve the Membrane Separation Performance of Amine‐Functionalized PIM‐1

Leveraging Free Volume Manipulation to Improve the Membrane Separation Performance of Amine‐Functionalized PIM‐1

Recent Progress in Mixed-Matrix Membranes for Hydrogen Separation

Effect of Direct Fluorination on the Transport Properties and Swelling of Polymeric Materials: A Review

Contact Info

Product

Resources

About