Characterization and Tribological Behavior of Octadecene,Dodecene and Undecenoic Acid Films on Si Substrate

摘要

The films of octadecene, dodecene, and undecenoic acid were prepared on H-terminated Si surface in the presenceof ultraviolet irradiation. The resulted films were characterized with water-contact angle measurement and infraredspectroscopy. The friction-reducing behavior of the prepared films was examined on a static-dynamic friction coef-ficient measurement apparatus and on an atomic force microscope. It was found that all the reacted films on theSi substrate showed good friction-reducing ability; especially, the film of the octadecene exhibited the best friction-reducing ability. This was attributed to the transfer of the reacted films onto the counter face with formation of atransfer film on the counterpart surface, which led to the transformation of the sliding between the reacted films andthe hard ceramic to that between the reacted films and its transfer film on the counterpart surface. The macroscopicand microscopic friction behaviors of the prepared films were dependent on their molecular chain lengths. Thusthe octadecene reacted film with the highest degree of ordering arrangement showed the best friction-reducing andantiwear abilities in sliding against Si3N4.