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Plasma polymerization of perfluoro‐2‐butyltetrahydrofuran/methane and perfluorobezene/tetrafluoromethane mixtures and gas permeation properties of the plasma polymers
Author(s) -
Inagaki N.,
Tasaka S.,
Murata T.
Publication year - 1989
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.1989.070381008
Subject(s) - polymer , polymerization , plasma polymerization , polymer chemistry , chemistry , permeation , infrared spectroscopy , plasma , organic chemistry , membrane , biochemistry , physics , quantum mechanics
Plasma polymer films prepared from perfluoro‐2‐butyltetrahydrofuran (PFBTHF) and perfluorobenzene (PFB) were investigated by elemental analysis, infrared spectroscopy, and ESCA. The gas separation properties were also investigated to seek plasma polymer films with good permselectivity. Plasma polymer films from PFBTHF and PFB were composed of polymer chains with fluorinated moieties such as C –CF n , C F, C F–CF n , C F 2 , and C F 3 groups. Changes in the afcurrent as an operating condition for plasma polymerization showed less influence on the distribution of the fluorinated moieties but more influence on the permselectivity of the plasma polymer films formed. The permselectivity was improved by plasma polymerization in the PFBTHF/CH 4 or PFB/CF 4 mixture systems. The P O2 / P N2 ratio for the plasma polymer films prepared from PFBTHF/CH 4 and PFB/CF 4 mixtures increased from 3.1 at 0 mol % CH 4 to 4.0 at 50 mol % CH 4 addition, and from 4.1 at 0 mol % CF 4 to 5.0 at 25 mol % CF 4 addition, respectively. The permselectivity of the plasma polymer films may be related to the crosslinkage and aggregation of polymer chains rather than the elemental composition.