Surface modification dielectric barrier discharge

Upadhyay et al. [98] used primarily correlated XPS and water contact angle measurements to study the surface degradation and recovery of amorphous films of a PMMA and a poly (aryl ether ether ketone) (PEEK). Surface modification of the films was carried out in a dielectric barrier discharge (DBD) unit, samples being treated with different dose levels of dielectric discharge. The modified (treated) samples were then stored for one month and re-examined. Figure 35 shows C(ls) and 0(1 s) XPS envelopes and their curve-fitting deconvolutions,... 

Bente, M., Avramidis, G., Forster, S., Rohwer, E.G. and Viol, W. (2004). Wood surface modification in dielectric barrier discharges at atmospheric pressure for creating water repellent characteristics. Holz alsRoh- und Werkstoff, 62(3), 157-163. 

Rehn, P. and Viol, W. (2003). Dielectric barrier discharge treatments at atmospheric pressure for wood surface modification. Holz. als Roh- und Werkstoff, 61(2), 145-150. 

The surface modification of the ground rubber tire (GRT) powder was found to be suitable for enhancement of its adhesion to nitrile rubber (NBR) vulcanizates (Zhang et al., 2009c). By use of the atmospheric pressure dielectric barrier discharge, the hydrophobic surface of the powder transformed to a hydrophilic one as shown by the water contact angle, ATR-FTIR, and X-ray photoelectron spectroscopic (XPS) studies. After atmospheric plasma treatment, the improvement in the tensile strength and tear strength was observed for the modified tire powder-filled NBR vulcanizates. The latter was attributed to the enhanced interfacial interaction between modified GRT and NBR matrix. 

Modification of Sugar Maple Acer saccharum) and Black Spruce (Picea mariana) Wood Surfaces in a Dielectric Barrier Discharge (DBD) at Atmospheric Pressure... 

Borcia G, Chiper A, Rusu 1. Using a He-FN2 dielectric barrier discharge for the modification of polymer surface properties. Plasma Sources Sci Technol 2006 15 849. 

Many different polymers have been studied over the years with UV/O3 treatment, including biodegradable polymers. A number of different strategies have been used for the production of ozone and its application in the modification of scaffold polyesters [88-95]. In addition to the traditional UV/O3 treatment, several research groups have begun using other techniques, such as dielectric barrier discharge in air for surface modification of polyester substrates [92,93]. 

Kikani, P., Desai, B., Chowdhuri, M.B. et al (2012) Use of dielectric barrier discharge in air for surface modification of polyester substrate to confer durable wettability and enhance dye uptake with natural dye eco-alizarin. Compos. Interfaces, 19 (3-4), 219-229. 

Surface Modification Using Dielectric Barrier Discharge (DBD)... 

Sarra-Bournet, C, Poulin, S., Piyakis, K., Turgeon, S., Laroche, G. (2010) ToF-SIMS multivariate characterization of surface modification of polymers by N2H2 atmospheric pressure dielectric barrier discharge. Surf. Interface Anal., 42,102-109. 

Detavemier, C., Dendooven, J., Sree, S.P., Ludwig, K.F., Martens, J.A., 2011. Tailoring nanoporous materials by atomic layer deposition. Chem. Soc. Rev. 40, 5242—5253. Dobbs, H.S., 1982. Fracture of titanium orthopaedic implants. J. Mater. Sci. 17, 2398—2404. Doherty, K.G., Oh, J.-S., Unsworth, P., Bowfield, A., Sheridan, C.M., Weightman, P., Bradley, J.W., Williams, R.L., 2013. Polystyrene surface modification for localized cell culture using a capillary dielectric barrier discharge atmospheric-pressure microplasma jet. Plasma Processes Polym. 10, 978—989. 

M.N. Acda, E.E. Devera, R.J. Cabangon, K.G. Pabelma and H.J. Ramos, Effects of dielectric barrier discharge plasma modification on surface properties of tropical hardwoods at low pressure, /. Tropical Forest Sci., 24, 416-425 (2012). 

Physical modification involves thermal treatments such as plasma or nonthermal treatments like application of electric discharge, ultrasound, ultraviolet, or high-frequency cold plasma to the fiber surface. Stmctural and surface properties of the fibers are changed by these treatments, which result in improved mechanical bonding to polymers. These treatments are apphed to separate the fiber bundles into individual filaments and modify the fiber surface for more compatibility with the matrix in the composite [6]. If separation of the fiber bundles is desired, methods like steam explosion and thermomechanical processing are adopted. Methods like plasma (thermal) treatment, dielectric barrier techniques, or corona discharge (nonthermal) treatments (CDT) are anployed to modify the fiber surface. 

Essentially, physical methods are employed on natural fiber during processing in order to separate natural fiber bundles into individual filaments and also to modify the surface structure of the fibers so as to improve the use of natural fibers in composites. Physical methods can be divided into two categories viz (1) steam explosion and thermomechanical processes and (2) plasma, dielectric barrier techniques, radiation modification, ultrasonic treatment, and corona discharge. In an effort to impart and improve reactivity, these physical treatments have been used to modify thermoplastic polymeric films like polyethylene and polypropylene and thermosets, such as epoxy. 

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