Surface treatment plasma

Adhesion of fluorosilicone compounds requires surface treatment. For particularly difficult surfaces plasma treatment is necessary. Flowever, for most common applications, satisfactory bonding is achieved by using a specialized primer.80... 

As mentioned earlier, the addition of rubber particles typically leads to the degradation of mechanical properties of the concrete due to a poor adhesion. However, it was shown that the adhesion of GRT of an average size of 120 ttm to cement was improved by applying surface plasma treatment to... 

Nodular Structure under the Top Surface Plasma Treatment... 

Plasma in MicroChannel, Fig. 4 External parameters that influence the quality of surface plasma treatment... 

Plasma treatment for material surface modification can be achieved using either simple gas plasmas without depositimi or organic vapor plasmas to deposit an ultrathin layer of plasma coatings on the surfaces. Plasma treatment possesses many unique advantageous features in surface modification of materials. Among these are ... 

Epoxies, isocyanate cured polyester, and cyanoacrylates are used to bond acetal copolymer. Generally, the surface is treated with a sulfuric-chromic acid treatment. Epoxies have shown 150 to 500 psi shear strength on sanded surfaces and 500 to 1000 psi on chemically treated surfaces. Plasma treatment has also been shown to be effective on acetal substrates. Acetal homopolymer surfaces should be chemically treated prior to bonding. This is accomplished with a sulfuric-chromic acid treatment followed by a solvent wipe. Epoxies, nitrile, and nitrile-phenolics can be used as adhesives. 

Bismarck A et al (2008) Effects of surface plasma treatment on trihology of thermoplastic polymers. Polym Eng Sci 48(10) 1971-1976... 

Thirdly, in order to improve the dispersion of platinum catalysts deposited on carbon materials, the effects of surface plasma treatment of carbon blacks (CBs) were investigated. The surface characteristics of the CBs were determined by fourier transformed-infrared (FT-IR), X-ray photoelectron spectroscopy (XPS), and Boehm s titration method. The electrochemical properties of the plasma-treated CBs-supported Pt (Pt/CBs) catalysts were analyzed by linear sweep voltammetry (LSV) experiments. From the results of FT-IR and acid-base values, N2-plasma treatment of the CBs at 300 W intensity led to a formation of a free radical on the CBs. The peak intensity increased with increase of the treatment time, due to the formation of new basic functional groups (such as C-N, C=N, -NHs, -NH, and =NH) by the free radical on the CBs. Accordingly, the basic values were enhanced by the basic functional groups. However, after a specific reaction time, Nz-plasma treatment could hardly influence on change of the surface functional groups of CBs, due to the disappearance of free radical. Consequently, it was found that optimal treatment time was 30 second for the best electro activity of Pt/CBs catalysts and the N2-plasma treated Pt/CBs possessed the better electrochemical properties than the pristine Pt/CBs. 

Surface modification refers to the modification that occurs only on the surface of a polymer material without further internal modification. Surface modifications of polymeric materials include surface chemical oxidation, corona surface treatment, surface flame treatment, surface heat treatment, surface plasma treatment, surface metallization processing, ion implantation, and surface grafting polymerization. Because surface modification occurs only on the surface of materials, the performance does not change uniformly. 

Alves, C M., Yang, Y., Carnes, D.L, Ong, J.L., Sylvia, V.L., Dean, D.D., Agrawal, C.M., and Reis, R.L. (2007) Modulating bone cells response onto starch-based biomaterials by surface plasma treatment and protein adsorption. J. Biomater., 28 (2), 307 315. 

This section describes the significant techniques available for the treatment of plastic surfaces to enhance adhesion (Fig. 5.2). Not all methods have wide commercial application. Some of the techniques are limited in the scope of their use. For example, chemical treatment (acid-induced oxidation) is the most frequently used method to impart adherability to plastic surfaces. Plasma treatment is limited to smaller components and parts. Flame and corona treatments are effective for continuous films (often called webs) and thin sheets of plastic, usually operated at high speed. 

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