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Plasma polymerized membranes and gas permeability. II
Author(s) -
Sakata Jiro,
Yamamoto Minoru,
Hirai Masana
Publication year - 1986
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.1986.070310704
Subject(s) - tetramethylsilane , plasma polymerization , polymer , hexamethyldisiloxane , membrane , octamethylcyclotetrasiloxane , monomer , oxygen permeability , permeability (electromagnetism) , polymer chemistry , polymerization , materials science , x ray photoelectron spectroscopy , analytical chemistry (journal) , chemical engineering , chemistry , oxygen , plasma , organic chemistry , composite material , biochemistry , physics , quantum mechanics , engineering
Abstract Thin films were deposited onto porous substrates by plasma polymerization using three kinds of organosilicic compounds, tetramethylsilane (TMS), hexamethyldisiloxane (M 2 ), and octamethylcyclotetrasiloxane (D 4 ). Those composite membranes showed different characteristics of gas permeability. When D 4 was plasma‐deposited onto a porous substrate, the composites membrane showed the highest oxygen permeability and the lowest oxygen‐to‐nitrogen permeability ratio. The composite membrane prepared from TMS showed the permeability characteristics opposite to the membrane obtained from D 4 . Infrared spectrum of the polymer from D 4 resembles that of dimethylpolysiloxane. The plasma polymers from TMS and M 2 showed different profiles in SiO absorption bands in the range 1100–1000 cm ‐1 or in absorption bands of SiCH 3 groups in the range 850–750 cm ‐1 from respective monomers. X‐ray photoelectron spectroscopic observation indicated that all the plasma polymers contained more than two species of Si atom with different oxidation states. The greater part of Si atoms in plasma polymers took the same oxidation states in corresponding monomer. The gas permeability characteristics were closely related to the oxidation states of Si atom in the plasma polymers.