A study on a perfluoropolymer purification and its application to membrane formation

Arcella, V.; Colaianna, P.; Maccone, P.; Sanguineti, A.; Gordano, Amalia; Clarizia, Gabriele; Drioli, Enrico

doi:10.1016/s0376-7388(99)00184-2

Cited by 57 publications

(28 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…4,7,8,[9][10][11][12][13] An emerging materials class that can potentially mitigate some limitations of commercial gas separation membranes is based on perfluorinated solution-processable glassy polymers, (Asahi Glass) and others. [14][15][16][17][18][19] These polymers are known for their excellent chemical and thermal properties as a result of their strong C-F bond energy (485 kJ/mole) in comparison to C-C (360 kJ/mole) bonds in hydrocarbon polymers. 19 Their unique structure/gas transport property relationships have set the limits of permeability-selectivity combinations on the 2008 Robeson upper bound for certain gas pairs such as He/CH 4 , He/H 2 , N 2 /CH 4 , and H 2 /CH 4 .…”

Section: Introductionmentioning

confidence: 99%

“…[14][15][16][17][18][19] These polymers are known for their excellent chemical and thermal properties as a result of their strong C-F bond energy (485 kJ/mole) in comparison to C-C (360 kJ/mole) bonds in hydrocarbon polymers. 19 Their unique structure/gas transport property relationships have set the limits of permeability-selectivity combinations on the 2008 Robeson upper bound for certain gas pairs such as He/CH 4 , He/H 2 , N 2 /CH 4 , and H 2 /CH 4 . 20 Because of their high selectivities and chemical inertness, these polymers were proposed for gas separation applications, specifically natural gas treatment, where condensable species were detrimental to the performance of traditional polymers as a result of plasticization.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Gas Sorption, Diffusion, and Permeation in Nafion

2015

View full text Add to dashboard Cite

The gas permeability of dry Nafion ® films was determined at 2 atm and 35 °C for He, H 2 , N 2 , O 2 , CO 2 , CH 4 , C 2 H 6 and C 3 H 8 . In addition, gas sorption isotherms were determined by gravimetric and barometric techniques as a function of pressure up to 20 atm. Nafion Barrer, respectively; all other gases exhibited low permeability that decreased significantly as penetrant size increased. Dry Nafion ® was characterized by extraordinarily high selectivities:He/H 2 = 5.2, He/CH 4 = 445, He/C 2 H 6 = 1275, He/C 3 H 8 = 7400, CO 2 /CH 4 = 28, CO 2 /C 2 H 6 = 79,

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Gas Sorption, Diffusion, and Permeation in Nafion

2015

View full text Add to dashboard Cite

show abstract

“…These perfluoropolymers are amorphous and solvent-processable, resulting in relatively high gas permeability and the feasibility to process them by solution casting and coating methods used in the membrane industry [3]. The gas transport properties of these commercial perfluoropolymers have been studied extensively over the past 25 years [4][5][6][7][8][9][10][11][12][13]. The perfluoropolymers have unique gas separation properties and in some cases they exceed the selectivitypermeability upper bound relationship originally described by Robeson [14].…”

Section: Introductionmentioning

confidence: 99%

Gas separation membranes prepared with copolymers of perfluoro(2-methylene-4,5-dimethyl-1,3-dioxlane) and chlorotrifluoroethylene

Fang

Okamoto

Koike

et al. 2016

Journal of Fluorine Chemistry

View full text Add to dashboard Cite

A B S T R A C TSeveral families of hydrocarbon polymers (polysulfones, polycarbonates, cellulose acetates, polyamides, and polyimides) have been established as common industrial gas separation membranes over the past three decades. Fluoropolymer membranes have found commercial use because of their unique gas separation properties in addition to their extraordinary chemical resistance and thermo-oxidative stability. To date, studies of gas transport in fluoropolymers have been limited largely to variants of the commercially available perfluoropolymers: Teflon 1 AF, Cytop TM , and Hyflon 1 AD. Here, we describe gas transport in composite membranes fabricated from copolymers of perfluoro(2-methylene-4,5-dimethyl-1,3-dioxolane) (PFMDD) and chlorotrifluoroethlyene (CTFE). This poly(PFMDD-co-CTFE)-based membranes have far superior gas separation performance compared to the commercial perfluoropolymers for a number of gas pairs, including H 2 /CH 4 , He/CH 4 , and CO 2 /CH 4 . The gas separation performance of the membranes depends strongly on the copolymer composition. Increasing the amount of CTFE up to 30 mol % in the copolymer increases the membrane selectivity and reduces permeance. The membranes based on 70 mol% PFMDD-30 mol% CTFE poly(PFMDD-co-CTFE) show H 2 /CH 4 and He/CH 4 selectivities of 210 and 480, respectively, values that far exceed those possible with the known commercial perfluoropolymers.

show abstract

“…They represent the ultimate resistance to hostile chemical environments and high service temperature, due to the high energy of CÀF (485 kJ Á mol À1 ) and CÀC (360 kJ Á mol À1 ) bonds of fluorocarbons. [2] In the late 1960s, Nafion developed by DuPont was employed as PEM in a GE fuel cell specifically designed for NASA spacecraft missions. Since then, Nafion has found wide applications for example in the chlor-alkali industry and others, where very high chemical inertness and low resistances to cation transport are required for the membrane.…”

Section: Introductionmentioning

confidence: 99%

Impact of Heating on the Structure of Perfluorinated Polymer Electrolyte Membranes: A Positron Annihilation Study

Hamed

Kobayashi

Kuroda

et al. 2011

Macro Chemistry & Physics

View full text Add to dashboard Cite

The ortho‐positronium (o‐Ps) lifetime was measured as a function of temperature for the perfluorinated PEMs Nafion NR212 and Aquivion E8705. The o‐Ps lifetime in Aquivion E8705 was found to be shorter than Nafion NR212 in the entire temperature range studied. Abrupt changes in the temperature coefficient of the o‐Ps lifetime were noticed and the α‐relaxation, β‐relaxation, and stress relief temperatures were identified. It turned out that Aquivion E8705 has higher α‐relaxation and stress relief temperatures than Nafion NR212. Dissociation of the ionic clusters and large change in the nanostructure after heating to 160 °C were observed for Nafion NR212 but not for Aquivion E8705. It is demonstrated that Aquivion E8705 has a higher thermal stability than Nafion NR212. magnified image

show abstract

A study on a perfluoropolymer purification and its application to membrane formation

Cited by 57 publications

References 4 publications

Gas Sorption, Diffusion, and Permeation in Nafion

Gas Sorption, Diffusion, and Permeation in Nafion

Gas separation membranes prepared with copolymers of perfluoro(2-methylene-4,5-dimethyl-1,3-dioxlane) and chlorotrifluoroethylene

Impact of Heating on the Structure of Perfluorinated Polymer Electrolyte Membranes: A Positron Annihilation Study

Contact Info

Product

Resources

About