複雑な表面構造を有する固体材料へのテトラフルオロエチレンプラズマ重合膜の被覆性

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A glow discharge of tetrafluoroethylene gas under reduced pressure was applied to solid substrates having complex surface structures to deposit a thin film of plasmapolymerized tetrafluoroethylene and the achievement of the resulting coating layers on the surfaces was investigated. Since the fluorocarbon polymer is known to be highly hydrophobic, 250-297μm grains of calcium pantothenate having significantly hygroscopic nature was plasma-coated to evaluate the coating effect by which moisture uptake of the material would be effectively prevented. It was observed, however, that considerable degree of moisture uptake was preserved though the thickness of the coating moderate film was 3500 Å. Therefore some imperfect spots in the coating layer and/or moisture transport through the polymer thin film were to be supposed. Another coating experiment with spherical particles of Porapak N having approximately the same diameter of the calcium pantothenate showed excellently uniform coating layer profiles by a microscopic observation of the sectional view of the particles. Other cases of the plasma coating with bulk material having sponge-like interior structure or compressed cellulose fiber block indicated some distribution of plasma-polymer from the surface towards certain depth of the materials, but the polymer steeply disappeared at the further interior. In consideration of various experiments, the plasma-coating of the calcium pantothenate was thought to be fairly perfect in contact with fresh plasma gas, but the polymer thin film was probably somewhat gas permeable for small molecules such as water vapor.
公益社団法人日本薬学会の論文
1983-07-25

複雑な表面構造を有する固体材料へのテトラフルオロエチレンプラズマ重合膜の被覆性

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