Friction and wear properties of NBR/PVC composites

Abstract

Acrylonitrial butadiene rubber (NBR)/Polyvinyl chloride (PVC) composites with different PVC content were prepared. The effect of PVC content on the mechanical strength and tribological properties of the NBR/ PVC composites was investigated. The morphologies of the worn traces and debris of NBR/PVC composites and worn traces of mating ball were observed using a scanning electron microscope (SEM). It was found that the friction and wear of NBR/PVC was lower than that of NBR without PVC. The NBR/PVC composite with 30% PVC content showed the best synthetic mechanical and tribological properties. The inferior elastic properties and the lesser deformation under the applied load of composites with PVC resulted in hysteric force and adhesion force decrease, which leading to a lower friction and wear of NBR/PVC composites. The frictional failure unit of NBR70/PVC30 composite being smaller should be an important reason of the wear of the composite being lowest. The lubricating effect of PVC played an important role in decreasing the friction coefficient and wear of NBR/PVC composites.

Foaming behavior of microcellular foam polypropylene/modified nano calcium carbonate composites

“…It has been widely accepted that the distribution of nano‐CaCO 3 is one of the most important factors in determining the foamability of PP,6 especially for the use of nano‐CaCO 3 because of its large specific surface area and high surface energy 21. The more homogeneous the distribution of nano‐CaCO 3 is, the better the foamability of the nanocomposites will be.…”

“…They had an average cell diameter in the range of 6.2–12.1 μm, which was smaller than that observed for the PP foam. Many other researchers have reported that blending nanoparticles into PP can improve the foamability 6,17,27…”

“…In this study, the PP and its nanocomposites were foamed with a batch microcellular foaming apparatus, as shown in a previous report 6. The foaming procedures were as follows: Samples were placed in a high‐pressure vessel (internal volume = 500 cm 3 ) that was calibrated with distilled water by a syringe pump The vessel was slowly flushed with low‐pressure CO 2 gas The vessel was heated to the infiltration temperature within 20 min The vessel was pressurized to the saturation pressure with high‐pressure CO 2 The samples were saturated in the vessel for 24 h at the saturation pressure. The vessel was heated to the foaming temperature within 20 min, with the saturation pressure remaining unchanged during the temperature increase and the temperature was kept the same for some time (foaming time). The vessel was depressurized to atmospheric pressure in less than 10 s. The foamed samples were injected out of the vessel and cooled to the room temperature in the air. …”

“…PP melts easily during saturation, and this reduces its foamability. Huang and Wang6 combined these two methods and created a new process for foaming polymers. With this new process, PP is saturated at a low temperature, and then, the temperature is increased to the foaming temperature.…”

Study on crystallization and compatibility of nitrile butadiene rubber (NBR)/polyoxymethlene (POM) blends modified by a polyether polyol

“…Among the different types of polymer blends, rubber and plastic blend has been an important one. Huang et al [1] reported that nitrile butadiene rubber (NBR)/polyvinyl chloride (PVC) composite with 30 wt.% PVC showed the best synthetic mechanical and tribological properties, and the lubricating effect of PVC played a role in decreasing the friction coefficient. Ismail et al [2] observed that the vulcanized PP/NBR blend had perfect tensile properties and oil resistance, and it was able to withstand serious natural weathering conditions.…”