Showing papers on "Surface modification published in 1979"

A novel method of preparing of glass capillary columns: Low‐temperature plasma etching and polymerization

Abstract: A novel method is described for the preparation of stable glass capillary columns (glass open tubular columns), including the etching and formation of a polymer film on the inner glass capillary surfaces. The approach used here is based on low-temperature plasma etching and polymerization. Under the influence of a field of radio frequency discharge, low pressure gases of fluoric compounds, introduced into the glass capillary tube, generate excited fluorine radicals which etch the inner surface. The plasma of organosilicone monomer in the glass capillary yields a uniform polymerized film on the inner surface. The resultant material functions as a good stationary phase for glass capillary gas chromatography (GC2). The inner surfaces treated with such a plasma, can be studied by means of a scanning electron microscope (SEM). The flexibility of this method permits the use of various stationary phases and surface modification.

Synthese von 4-Trichlorsilylmethylbenzonitril und 4-(2-Trichlorsilyläthyl)pyridin zur Oberflächenmodifikation von Zinndioxid

Abstract: Synthesis of 4-Trichlorosilylmethylbenzonitrile and 4-(2-Trichlorosilylethyl)pyridine for Surface Modification of Tin Dioxide We describe the synthesis of 4-(trichlorosilylmethyl)benzonitrile and 4-(2-trichlorosilylethyl)pyridine, starting from 4-(bromomethyl)benzonitrile and trichlorosilane or vinylpyridine and trichlorosilane. Trimethoxysilanes are obtained by reaction of the trichlorosilyl compounds with methyl orthoformate. 4-(Trichlorosilylmethyl)benzonitrile and 4-(2-trichlorosilylethyl)pyridine are used to modify the surface of tin dioxide.

Surface modification of polytetrafluoroethylene

Abstract: PURPOSE: To render the surface of a polytetrafluoroethylene material hydrophilic and sensitive to adhesives, by plasma-polymerizing a nitrogen-containing aromatic compound on the surface of the polytetrafluoroethylene material. CONSTITUTION: A nitrogen-containing aromatic compound is polymerized on the surface of a polytetrafluoroethylene material to form a polymer layer thereon. Examples of the nitrogen-containing aromatic compound which is applicable include N,N-dimethylaniline, N-monomethylaniline, aniline, benzonitrile, benzamide and pyridine. With respect to the thickness of the polymer layer formed from the nitrogen-containing aromatic compound, a thickness of 100W1,000Å is preferred from a point of durability, and a thickness of 100W500Å is particularly preferred from a point of peel resistance. COPYRIGHT: (C)1980,JPO&Japio

Surface modification of high polymer substrate

Abstract: PURPOSE:To increase the grafting rate, to prevent the outflow of photopolymerizable compounds, and to improve the productivity of surface modification of a high polymer substrate, by bringing a solid masking body into contact with the surface of a photopolymerizable composition in contact with a high polymer substrate, and by irradiating the light transmitting side with active ray of light. CONSTITUTION:A photopolymorizable composition a containing a radically polymerizable compound, a photosensitizer, etc. is brought into contact with a high polymer substrate, and a solid masking body is brought into contact with the surface of the photopolymerizable composition layer in contact with the polymer substrate. At least one light transmitting side of the high polymer substrate and masking body is irradiated with active ray of light. Maleic anhydride, (meth) acrylamide, triyhtlene gylcol mono(meth)acrylate, etc. may be cited as the radically polymorizable compound. Benzoin ether, acetophenone, ferrous chloride-Eosine, etc. may be cited as the photosensitizer.

The Modification of Porous Polymer Beads; Use Packing Material in Gas Chromatography

Abstract: A new method of the surface modification of a porous polymer has been developed and applied to packing materials for gas chromatography. The porous polymer was coated with a α,β-unsaturated polyester solid polymer, which had a high acid value and which was cross-linked on the porous polymer by polymerization. By using this in gas chromatography, formic acid peaks are completely separated from acetic acid and water peaks without any apparent tailing. This polyester layer was not extractable and could stably be used at 230 °C or higher. If the diallyl phthalate polymer is used instead of the α,β-unsaturated polyester, propionic acid and acrylic acid, which are very diffecult to separate, were resolved. The present method may be applicable to some components of composite materials.