聚苯醚金属离子注入改性层的硬度和磨擦学性能

为研究离子注入技术对聚苯醚（PPO）的表面硬度和耐磨性的提高效果，分别将3种剂量（2×1015 cm－2、1×1016 cm－2和1×1017 cm－2）的Al、Ti 、Fe离子注入PPO。纳米硬度测量显示，1×1016 cm－2 Ti离子注入PPO后其硬度由0.369 GPa增至1.433 GPa，离子注入使PPO表面形成一层交联层，导致其硬度提高。磨损实验表明，3种离子注入后均可使PPO的耐磨性提高，摩擦因数下降；其中1×1016 cm－2 Ti离子注入PPO的磨损体积降为原来的0.4%，摩擦因数下降了40％。红外光谱分析表明，离子注入后PPO表面形成羟基和羰基等新的基团，羟基的形成主要与表面微量吸水有关。电子自旋共振(ESR)分析显示离子注入可以形成自由基，离子注入诱发交联的方式主要为自由基交联。

Hardness And Tribological Properties of Surface Modified Layers of Polyphenylene Oxide by Metal-Ion Implantation

The technique of ion implantation was employed for improving surface hardness and wear resistance of Polyphenylene Oxide(PPO). The samples of PPO were implanted separately with Al, Ti and Fe ions to three doses of 2×1015 ions cm－2, 1×1016 ions cm－2 and 1×1017 ions cm－2. Nano-hardness increased from 0.369 GPa for the plain PPO to 1.433 GPa for 1×1016 ions cm－2 Ti-implanted PPO. The cross-linking structures induced by ion implantation were responsible for the improvements in hardness. Wear tests showed that wear-resistance of PPO was improved significantly and friction coefficient was reduced. 1×1016 ions cm－2 Ti ion implantation produced the largest improvement in tribological properties, and wear volume and friction coefficient of 1×1016 ions cm－2 Ti-implanted PPO were reduced respectively to 0.4% and 60% as compared to those of the pristine PPO. IR spectra of Al and Ti-implanted PPO indicated the occurrence of the hydroxyl and carbonyl groups on the implanted PPO surface. The formation of the hydroxyl group was related to moisture absorption on the sensitized PPO surface after the specimens were exposed to the atmosphere. Electron Spin Resonance (ESR) analyses showed that ion implantation could lead to the formation of free radicals and the main cross-linking mode was the reactions among the free radicals.