聚酰亚胺薄膜的制备及其摩擦学性能研究

通过浸渍得到了聚酰胺酸薄膜,采用适当的方法对薄膜进行处理之后再进行热亚胺化得到聚酰亚胺薄膜.用DF-PM型动静摩擦系数精密测定装置考察所得到的聚酰亚胺薄膜的摩擦学性能.用SEM考察了聚酰亚胺薄膜的磨痕形貌和对偶Si3N4陶瓷球表面的转移膜的形貌.结果表明,聚酰亚胺薄膜在与Si3N4陶瓷球对磨时,由于在摩擦过程中,聚酰亚胺能够在对偶面上形成均匀的并且低剪切强度的转移薄膜,因此表现出了优异的减摩与抗磨性能.聚酰亚胺薄膜的摩擦和磨损行为主要取决于薄膜的制备条件.

Preparation and Tribologicalcharacteristics of Polyimide Thin Films

Three polyimide films were prepared on glass substrate by sintering of the corresponding poly(amic acid)precursor dipped coatings at proper temperature and duration.The tribological behaviors of the polyimide films in dry sliding against Si 3N 4 ball were examined on a unidirectional friction and wear tester at ambient conditions and in a ball-on-block contact configuration.The morphologies of the worn polyimide films and their transfer films on the counterpart Si 3N 4 ball surface were observed with a scanning electron microscope.The resulting polyimide films showed excellent friction-reducing and antiwear behavior in dry sliding against the Si 3N 4 ball,because of their transfer onto the counterpart Si 3N 4 surface and the succeeding formation of the transfer films with lower shearing strength.The friction and wear behavior of the polyimide films were greatly dependent on the preparation condition.It was impossible to reach favorable tribological behavior of the polyimide films unless the poly(amic acid)dip-coated films on the glass substrate were fully rinsed before imidization.