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Gas separation membrane made by plasma polymerization of 1,3‐ditrifluoromethylbenzene/CF 4 mixture
Author(s) -
Inagaki N.,
Tasaka S.,
Park M. S.
Publication year - 1990
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1990.070400113
Subject(s) - plasma polymerization , permeation , polymerization , polymer , polymer chemistry , alkyl , fluorine , plasma , membrane , infrared spectroscopy , chemistry , analytical chemistry (journal) , materials science , chemical engineering , organic chemistry , biochemistry , quantum mechanics , engineering , physics
Abstract Plasma polymerization of 1,3‐ditrifluoromethylbenzene (DTFMB)/CF 4 mixture was investigated by means of elemental analysis and infrared spectroscopy and the permeation properties of the formed plasma polymer films were examined. The plasma polymerization deposited films containing fluorine atoms, of which the concentration depended on the starting composition of the DTFMB/CF 4 mixture. The films were composed of fluorinated alkyl moieties with a small amount of fluorinated aromatic moieties and carbonyl moieties. The CF 4 addition to DTFMB caused the breaking down of aromatic rings. Permeation properties of the plasma polymer films depended on the starting composition of the DTFMB/CF 4 mixture, the discharge current, and the thickness of the deposited films. The permselectivity was enhanced by adding CF 4 and increasing the discharge current. Plasma polymer films prepared from DTFMB/CF 4 mixture containing 75 mol % CF 4 at a discharge current of 150 mA had a permselectivity of 5.0 and an oxygen permeation coefficient of 3.5×10 ‐10 cm 3 (STP) cm/cm 2 s cm Hg.