Showing papers on "Surface modification published in 1969"

Attachment of amino groups to polymer surfaces by radiofrequency plasmas

Abstract: Low temperature gaseous plasmas of ammonia or nitrogen–hydrogen mixtures contain NH2 groups, or precursors thereof, formed in the plasma, which experimental evidence strongly suggests, can add to various polymer surfaces. The plasmas were established in the 0.3–1.5 torr range by radiofrequency (13.56 MHz) electrodeless excitation at powers ranging from 50 to 500 W. Samples of polypropylene, poly(vinyl chloride), polytetrafluorethylene, polycarbonate, polyurethane, and poly(methl methacrylate) were investigated. All these polymers added amino groups to varying degrees of amino site densities depending on the choice of plasma parameters and the reactivity of the polymer itself. In every instance the polymer was rendered more wettable, although no quantitative wettability measurements were made. Following the plasma treatment, degrees of amino attachment to the polymer were followed radiometrically and reported in terms of “heparin thicknesses” resulting from ionic heparin 35S attachment to quaternary sites produced from the amino groups. Two implications of such a surface modification are to adhesion and blood compatible materials preparation.

Fiber Surface Modification. Pt. II Modification of Ligniferous Wood and Bark Fibers Using a Dichloro-s-triazine

Abstract: Aufschlußverhalten auf Grund der Basenstärke nicht erklären. In beiden Fällen handelt es sich um tertiäre Amine, die am N-Atom leicht Additionsverbindungen eingehen. Es wäre daher denkbar, daß diese Basen die während des Aufschlußprozesses bei den Ligninabbaureaktionen gebildeten Bruchstücke abzufangen vermögen und dadurch die unerwünschten Kondensationsreaktionen verhindern (Kl ein er t 1967).

Float glass apparatus with adjustable surface modification means

Abstract: Surface treatment of heated glass is effected by locating a body of molten material in contact with a glass surface to be treated. The molten body clings to an elongated locating member supported by a plurality of support members which are adjustable to maintain the locating member linear.

Surface Modification of Synthetic Fibers with Metal Salts of Amphoteric Surface Active Agents

Abstract: 合成繊維の表面改質剤としての両性界面活性剤金属塩の性能を検討した。両性界面活性剤金属塩を練り込んだ合成繊維の臨界表面張力と洗剤水溶液中で流動パラフィン,オリーブ油による水中接触角を測定して,合成繊維の洗浄,WetSoilingとの関係をみた。両性界面活性剤金属塩を練り込んだ合成繊維は空試験に比較して臨界表面張力は高く,洗剤水溶液中での表面エネルギーは低いので,WetSoilingは少なく,汚れは洗浄で容易に除去される。両性界面活性剤のNi塩を練り込んだポリプロピレンはpH4.7～7.8に等電点が生じた。ポリプロピレンの染着性が向上し,光,摩擦,洗浄に対する染色堅牢性も高められた。さらに光によるポリプロピレンの劣化が,両性界面活性剤のNi塩の練り込みによって防止された。両性界面活性剤金属塩を練り込んだナイロン,ポリプロピレンの摩擦係数は空試験に比較して低く,柔軟な風合を示した。