新型人工关节材料UHMWPE中添加剂结构的研究

Structure of Additives in Ultra-High Molecular Weight Polyethylene as New Artificial Joints Materials

合成了乙二胺缩水杨醛西佛碱铜配合物、1,6-己二胺缩水杨醛西佛碱铜配合物、1,2-环己二胺缩水杨醛西佛碱铜配合物、邻苯二胺缩水杨醛西佛碱铜配合物和纳米级乙二胺缩水杨醛西佛碱铜配合物共5种二胺缩水杨醛西佛碱铜配合物作为改性超高分子量聚乙烯(UHMWPE)的添加剂。通过傅里叶变换红外光谱仪和扫描电镜对产物的结构、形貌和粒径进行了表征。采用往复摩擦磨损试验机研究了改性UHMWPE/钛合金的摩擦系数,并测定磨损表面三维形貌。结果表明:烷基越小改性活性越高,烷基最小的乙二胺缩水杨醛西佛碱铜配合物的摩擦学改性活性最高;在改性添加剂低用量(5%)情况下,对于减少改性UHMWPE的磨损,纳米级乙二胺缩水杨醛西佛碱铜配合物粉体比微米级添加剂效果更加显著。

Five kinds of diamine Schiff base Cu（II） complexes as additives for modifying uhra-high molecular weight polyethylene （UHMWPE） were synthesized, namely, Cu （II） complex with ethlenediamion-N, N＇-bis （salicylidene） , Cu （II） complex with 1,6-hexanediamine-N, N＇-bis （salicylidene） , Cu （II） complex with 1, 2-cyclohexanediamion-N, N＇-bis （salicylidene）, Cu （II） complex with 1, 2-phenylendiamion-N, N＇-bis （salicylidene） and nano-Cu （II） complex with ethlenediamion-N, N＇-bis （salicylidene）. The structures, morphologies and particle sizes of the products were characterized by Fourier transform infrared spectroscopy and scanning electron microscopy. Friction coefficient of the modified UHMWPE/titanium alloy was tested by a reciprocating friction and wear tester, 3D topographies of the worn surfaces were also investigated. Results showed that the smaller alkyl showed higher modifying activity, the Cu （II） complex with ethlenediamion-N, N＇-bis （salicylidene） displayed the highest tribological modifying activity with the smallest alkyl. When the additive amount was low （5%）, the nano-powder of ethlenediamion-N, N＇-bis （salicylidene） Cu （II） complex was more effective to improve anti-wear property of the modified UHMWPE than that of micro size.