Friction and wear behavior of Polyoxymethylene/Poly (lactic acid) blends (POM/PLA) was investigated to study effect of PLA content on friction and wear properties. The sliding experiments were carried out by Frictoron EFM-III machine. POM blends sliding against the carbon steel (AISI 1045) counterpart under 200 N of pressure load, 100 mm/s of sliding speed for 60 minutes. The wear weigh loss was measured after wear experiment. Wear profile and worn surface were observed by SEM. It was found that friction coefficient of neat POM is lower than neat PLA. However, the incorporation of PLA into POM led to an increment of friction coefficient of POM blends both of 40% and 60% PLA content that over than neat POM and PLA. While wear weigh loss resulted the increasing with increasing of PLA content, which were supported by wear prolife photographs. The deformation of neat PLA and blends on worn surface originated from adhesive due to the thermal softening and melting behavior, while neat POM reveals the plough action behavior.
In this study, the short glass fiber reinforced polyoxymethylene composites were fabricated by direct fiber feeding injection molding (DFFIM). The processing parameters such as number of fiber, matrix feeding speed and screw rotational speed are study the effect on fiber content, fiber length and mechanical properties. Fiber orientation and fiber distribution are observed by scanning electron microscope. The maximum and minimum fiber content are 34.1 and 11.5 wt.%, respectively. The increasing of number of fiber and screw rotational speed and the decreasing of matrix feeding speed lead to the increasing of fiber content. Tensile modulus increase when fiber content increase. However, tensile strength do not increase when fiber content is over 23.3 wt.% due to poor orientation and distribution of glass fiber.
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