Effects of Glass-to-Rubber Transition on the Friction Properties of ZrO2 Reinforced Polybenzoxazine Nanocomposites
Tóm tắt
The present work is a generic study to examine the effects of the glass-to-rubber transition of resin matrix on the friction and wear characteristics of zirconium oxide (ZrO2) reinforced polybenzoxazine nanocomposites, in relation to the content of ZrO2. The thermal and tribological properties of the nanocomposites were measured by dynamic mechanical thermal analysis (DMA) and friction test, respectively. DMA results revealed that the storage modulus and T
g values of the nanocomposites increased with increasing ZrO2 content to 4 wt%, due to the exceptional mechanical strength of ZrO2 particles and the interfacial adhesion between ZrO2 and matrix to restrict the segmental motion of polymer. The friction coefficient (COF) values as a function of applied load (50–750 N) for the nanocomposites under testing temperatures (50, 100, 200, 250, and 300 °C) were measured. Comparable to the pure resin, the nanocomposites possessed relatively higher COF values with the increase of applied pressure under varying temperatures, which resulted from the reinforcement of ZrO2. It is noted that the nanocomposites containing 4 wt% ZrO2 occupied relatively higher modulus and glass transition temperature, resulting in better capability to stabilize the friction coefficient and wear rate under the applied conditions. In addition, the friction mechanism of the nanocomposites were proposed based on the experimental and reference results.
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