几种共聚型聚酰亚胺薄膜的摩擦学性能研究

Friction and Wear Behavior of Co Polymerized Polyimide Films in Dry Sliding Against Steel

多年来 ,对共聚型聚酰亚胺薄膜的摩擦学研究报道较少 ,为了对其摩擦学应用提供试验依据 ,以均苯四甲酸酐、邻苯二胺、间苯二胺和对苯二胺为原料 ,利用具有不同组成的 2种二胺的混合溶液与以均苯四甲酸酐进行反应 ,通过 2步法在玻璃表面制备了共聚型聚酰亚胺薄膜。采用热分析仪考察了聚酰亚胺薄膜的热稳定性 ,用DF PM型动静摩擦因数精密测定装置考察了其摩擦学性能。结果表明 ,由邻苯二胺以及邻苯二胺含量较高的混合溶液与以均苯四甲酸酐反应得到的聚酰亚胺薄膜的摩擦学性能明显优于由其他物质制成的聚酰亚胺的性能。

Tribological behavior of co polymerized polyimide (PI) was rarely studied for many years. To provide experimental data for its tribological application, several co polymerized polyimide films were prepared on the surface of glass by two steps methods with mixing pyromellitic dianhydride (PMDA) with (o phenylene) diamine (OPA), (m phenylene) diamine (MPA), and p phenylene (PPA), or with the mixture of OPA MPA, OPA PPA, and MPA PPA of different proportions. The thermal stabilities of the PI films were examined by means of thermal gravimetric analysis, and the friction and wear behaviors of the PI films in dry sliding against SAE52100 steel ball were evaluated on a DF PM unidirectional friction and wear test rig in a ball on block contact configuration, besides the worn surface morphologies of the PI films and their transfer films on the counterpart steel ball were analyzed with a scanning electron microscope. As the results, the synthetic PIs show different thermal stability with the various monomer amines and the proportions of two component amine mixtures. The one from OPA and PMDA shows better friction and wear behavior but poorer thermal stability than that from MPA and PMDA, and the friction and wear behavior of the PI films prepared from OPA and MPA of different proportions with PMDA is dependant on the proportions of amines mixtures as well. All the PI films are characterized by adhesion wear, plastic deformation, and fatigue peeling off, in dry sliding against the steel.