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곽순종,노동일,임윤묵,노영창,장주웅,심영복,전흥재 한국고분자학회 2009 Macromolecular Research Vol.17 No.8
Novel ultra-high molecular weight polyethylene (UHMWPE)/zirconia composites were previously prepared by the in situ polymerization of ethylene using a Ti-based Ziegler-Natta catalyst supported on to the surface of zirconia, as a bearing material for artificial joints. Tribological tests revealed that a uniform dispersion of zirconia in UHMWPE markedly increased the wear resistance. The effects of zirconia content on the oxidation behavior of the γ-ray-treated UHMWPE/zirconia composite surfaces were examined. The oxidation index that estimates the oxidation degree as the content of total carbonyl compounds was monitored using Fourier transform infrared spectroscopy- attenuated total reflectance. The changes in the surface composition due to the oxidation were confirmed by electron spectroscopy for chemical analysis. The extent of oxidation decreased with increasing zirconia content, which was attributed to the increased crystallinity as well as the decreased polymer portion of the UHMWPE/zirconia composites.
Surface Modification of Poly(ethylene-2,6-naphthalate) Using NH3 Plasma
육주영,곽순종,이명숙,송광호,전재호 한국고분자학회 2014 Macromolecular Research Vol.22 No.5
We have performed NH3 plasma treatment of poly(ethylene-2,6-naphthalate) (PEN) surfaces with the purposeof incorporating nitrogen functional groups. X-Ray photoelectron spectroscopy (XPS) and time-of-flight secondaryion spectroscopy (ToF-SIMS) were used to determine changes in the chemical structure of the PEN surfacesin response to different levels of plasma power. Plasma power had a significant impact on the type of nitrogen functionalgroups as well as the level of nitrogen incorporation. Considerable degradation and oxidation occurred withan excessive plasma power, rather than nitrogen incorporation. Optical emission spectroscopy (OES) confirmed thatthe type of chemical species present in the plasma discharge primarily determines the surface functionality with theplasma treatment. Partially decomposed ammonia species (NH and NH2) are considered to react with the PEN surfaceand form primarily amine groups. However, stable N2 species produced by bimolecular combination of fullydecomposed atomic species led to the formation of imine groups via atomic rearrangement. Moreover, ion bombardmentby N2+ species adversely affected the chemical structure of the surface, resulting in degradation of ester andcarbon-carbon bonds and surface etching of carbon atoms.