A Study on the Tribological Properties of Self-assembled Method Treated Nano-La 2 O 3 Filled PTFE/PEEK Composites

Abstract

In this article, the surface of nanometer lanthanum oxide (nano-La₂O₃) was modified with n-octadecyltrichlorosilane (OTS). Meanwhile, the influence of OTS on the tribological properties of nano-La₂O₃/PTFE/PEEK nanocomposites was investigated. For comparing, unmodified and coupling agent KH-550 modified nano-La₂O₃ were also used. Results indicate that OTS can be successfully assembled on the surface of nano-La₂O₃, which increases the water contact angle of nano-La₂O₃ significantly and reduces the aggregation behavior of nano-La₂O₃. Thus the dispersion and compatibility of nano-La₂O₃ in the polymer matrix are improved. At 10 wt% nano-La₂O₃ filler content, the wear rate of nano-La₂O₃/PTFE/PEEK composites reaches the lowest value, which is 2.27 times lower than that of PTFE/PEEK composites. OTS treated nano-La₂O₃ filled PTFE/PEEK composites can form a uniform transfer film on the counterpart surface, while unmodified nano-La₂O₃ cannot. Results also show that the degree of crystallinity of OTS modified nano-La₂O₃ filled PEEK is 2.6 times higher than that of unmodified nano-La₂O₃ filled PEEK, and it is obviously higher than that of pure PEEK.

Keywords

PEEK composites nano-lanthanum oxide self-assembled modification tribological properties octadecyltrichlorosilane (OTS).

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