NiTi合金表面低温等离子体接枝类PEG研究

Study on PEG-like Structures Grafted on NiTi Alloys Surface with Cold-Plasma-Process

众所周知表面接枝类聚乙二醇 (PEG)可以改善材料的生物相容性。本文研究了氧 二 (乙二醇 )甲醚低温等离子体条件下NiTi合金表面接枝PEG结构及其性质。经X射线光电子能谱 (XPS)、衰减全反射红外光谱 (ATR FT IR)、扫描电镜 (SEM)和水接触角的分析和表征 ,证实沉积的涂层为类PEG结构 ,表面主要聚集大量 (—CH2 —CH2 —O) n键 ;与改性前相比 ,接枝后的NiTi合金亲水性有较大提高。

Surface grafted poly(ethylene glycol)(PEG) molecules are known to modify the property of biocompatibility for materials. The characterization of PEG-like structures grafted on NiTi alloys surface under oxygen/di(ethylene glycol) methyl cold-plasma-process from electron cyclotron resonance conditions was studies in this paper. The chemistry of coatings was investigated by XPS, ATR-FTIR, SEM and water contact angle analysis. It indicated that the plasma modification resulted in the deposition of PEG-like structures, built up mainly of —CH 2—CH 2—O— linkages. Compared to the unmodified surfaces, the plasma-treated surfaces were more hydrophilic.