Surface modification of polyethylene by low keV ion beams

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• 作者：Tó ; th ; A. ; Bell ; T. ; Bertó ; ti ; I. ; Mohai ; M. ; Zelei ; B.
• 关键词：34.50.Dy ; 68.35.Dv ; 73.20.At ; 81.65.&minus ; b ; 82.65.&minus ; i ; Polyethylene ; CN_x ; Ion beam ; Surface structure ; IR ; XPS
• 刊名：Nuclear Instruments and Methods in Physics Research Section B ; Beam Interactions with Materials and Atoms
• 出版年：1999
• 期刊代码：42_0168583x
• 类别：ph
• 出版时间：January 2, 1999
• 卷：148
• 期：1-4
• 页码：1131-1135
• 文件大小：156 K

摘要

Ultra-high molecular-weight polyethylene (UHMWPE) and linear polyethylene (LPE) were treated by low keV H₂⁺, He⁺ and N₂⁺ ion beams up to 2 × 10¹⁷ ions cm⁻², and the chemical changes induced in the modified surface layer were studied by FT-IR and XPS. The concentration of vinyl groups decreased, while that of the trans-vinylene, trans-trans diene, methyl and carbonyl groups increased. The degree of polymer crystallinity was reduced. Changes in the valence band, in the C KVV Auger peak and in the plasmon loss splitting of the C1s peak indicated the occurrence of graphitisation. On treatment by N₂⁺ ions – in addition to the above changes – nitrogen incorporation took place. The N-content of the surface layer reached a saturation value of 11 at%at 10¹⁷ ions cm⁻². The N1s peak was decomposed to three components at 398.3, 400 and 402.8 eV, which were assigned to nitrogen in C–N, C=N (imine), and C=N with delocalised nonbonding electron pair on N, respectively.