| 초록 |
To reduce the friction coefficient of artificial joint, zwitterionic polymers was grafted. Thermal grafting method was induced to overcome the drawbacks of the UV grafting, and [2-(Methacryloyloxy)ethyl dimethyl-(3-sulfopropyl)ammonium hydroxide](MEDSAH) was used. The uniform graft layer on cross-linked polyethylene(CLPE) with a thickness exceeding 200nm was obtained. This zwitterionic surface performed lower friction coefficient. The XPS data showed that the zwitterionic layers were successfully grafted onto CLPE surface. Friction tests, wear tests, and 3D confocal microscopy confirmed that there was a significant decrease in the friction coefficient and wear. Uniform graft layer thickness on the curved CLPE surface was observed by transmission electron microscopy(TEM) images. Thus, we obtained thick graft layer of Poly-MEDSAH via thermal grafting method, and confirmed that thermal grafting with MEDSAH is advantageous for the friction coefficient reduction of artificial joint surface. |
