The friction and wear properties of the water lubricated rubber bearing, made of the nitrile butadiene rubber (NBR), were studied in this article. The results showed that adding the appropriate amounts of carbon black and molybdenum disulfide (MoS2) could reduce the friction coefficient and the abrasion loss to the minimum values. Meanwhile, the general laws of the two parameters with different loads, rotational speeds and lubricant media have been discovered: the values of friction coefficient and abrasion loss of the rubber bearing, lubricated in both water and seawater, increase firstly and then gradually decrease with the increasing loads.When the loads exceed 500N, the values increase drastically. And the values of friction coefficient and abrasion loss decline with the increasing rotating speed. Moreover, the values of these two parameters in seawater were a little bit higher than those in water. The friction and wear mechanisms of water lubricated rubber bearing were also discussed..
The main-chain structure and chlorine distribution of chlorosulfonated polyethylene (CSM), which was prepared via gas-solid phase method, were studied in this article. All the structure types of CSM 3550 and CSM 3570 were completely characterized by Nuclear Magnetic Resonance (NMR). According to the1H NMR and13C NMR spectra, the chlorine content (Cl wt %) and sulfur content (S wt %) of CSM 3550 and CSM 3570 could be completely calculated and this value was much close to the theoretical values, which were provided by the manufacturer. The comparison shows that the chlorine distribution of CSMs via gas-solid phase method is more uniform than that of CSMs via solution method.
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