TY - JOUR
T1 - Gas separation membranes prepared with copolymers of perfluoro(2-methylene-4,5-dimethyl-1,3-dioxlane) and chlorotrifluoroethylene
AU - Fang, Minfeng
AU - Okamoto, Yoshiyuki
AU - Koike, Yasuhiro
AU - He, Zhenjie
AU - Merkel, Timothy C.
N1 - Funding Information:
This research was supported partially by NSF through the Grant No. 11P-1149053 . We thank Dr. Chunhua Hu at the NYU Department of Chemistry X-ray Diffraction Facility for his assistance with X-ray diffraction measurements.
Publisher Copyright:
© 2016 Elsevier B.V.
PY - 2016/8/1
Y1 - 2016/8/1
N2 - Several 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® AF, Cytop™, and Hyflon® 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 H2/CH4, He/CH4, and CO2/CH4. 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 H2/CH4 and He/CH4 selectivities of 210 and 480, respectively, values that far exceed those possible with the known commercial perfluoropolymers.
AB - Several 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® AF, Cytop™, and Hyflon® 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 H2/CH4, He/CH4, and CO2/CH4. 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 H2/CH4 and He/CH4 selectivities of 210 and 480, respectively, values that far exceed those possible with the known commercial perfluoropolymers.
KW - Chlorotrifluoroethylene
KW - Gas separation membrane
KW - Perfluoro dioxolane
KW - Perfluoropolymer
KW - Poly(PFMDD-co-CTFE)
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U2 - 10.1016/j.jfluchem.2016.05.013
DO - 10.1016/j.jfluchem.2016.05.013
M3 - Article
AN - SCOPUS:84974625986
SN - 0022-1139
VL - 188
SP - 18
EP - 22
JO - Journal of Fluorine Chemistry
JF - Journal of Fluorine Chemistry
ER -