2015),"Study on antifriction mechanism of lubricating wear-resistant coating with parallel texture", Industrial Lubrication and Tribology, Vol. 67 Iss 5 pp. 418-424 http://dx.If you would like to write for this, or any other Emerald publication, then please use our Emerald for Authors service information about how to choose which publication to write for and submission guidelines are available for all. Please visit www.emeraldinsight.com/authors for more information. About Emerald www.emeraldinsight.comEmerald is a global publisher linking research and practice to the benefit of society. The company manages a portfolio of more than 290 journals and over 2,350 books and book series volumes, as well as providing an extensive range of online products and additional customer resources and services.Emerald is both COUNTER 4 and TRANSFER compliant. The organization is a partner of the Committee on Publication Ethics (COPE) and also works with Portico and the LOCKSS initiative for digital archive preservation. AbstractPurpose -The aim of this work is to synthesize neopentyl glycol oligoesters based on adipic acid and rapeseed oil (NOAR) which may be used as the renewable and environmentally acceptable base fluids to replace mineral oils in the future. Design/methodology/approach -Oligomeric intermediates were synthesized in the first esterification of neopentyl glycol with adipic acid and characterized by Gas Chromatography-Mass Spectrometer (GC-MS) to calculate the average oligomerisation degree. NOAR were synthesized in the second esterification of oligomeric intermediates with rapeseed oil fatty acid. The effects of average oligomerisation degree on the viscosity, viscosity index, pour point, oxidative stability and biodegradability of NOAR were investigated; the tribological properties and thermal stability of NOAR were evaluated by four-ball tribometer and TGA, respectively. Findings -Results show that with the increase of average oligomerisation degree from 2.10 to 4.34, the viscosity of NOAR increased from 101.1 to 182.0 (mm 2 /s) at 40°C and 18.3 to 30.1 (mm 2 /s) at 100°, respectively, and their oxidation stability can be improved as well. The yields of NOAR were 83.3-89.4 per cent, and the evaluated properties were as follows: viscosity index of over 200, pour point of below Ϫ43°C, biodegradation rate of more than 96 per cent, maximum non-seizure load (PB value) of 784 N, wear scar diameters of 0.40 mm and thermal decomposition temperature of higher than 300°C. Originality/value -This work provides a method to synthesize rapeseed oil-based oligoesters which can serve as the renewable and environmentally acceptable base fluids with tunable viscosity by controlling the oligomerisation degree of esterification.

Solid acid S 2 O 2-8 /TiO 2-La 2 O 3 (STL) was prepared by calcination at high temperature using complex oxide of TiO 2 doped La 2 O 3 as the supporter , and anion S 2 O 2-8 as the accelerant. The catalytic synthesis of n-butyl propanoate over STL was selected as the probe reaction to examine its catalytic esterification activity. The preparing conditions of STL were optimized via Taguchi method. The acidic structure, species and strength of STL were characterized by FTIR directly, FTIR spectrum of pyridine adsorbed on its surface and Hammett indicator, respectively. The esterification product was characterized by 1 HNMR and FTIR. The experimental results showed that the optimum preparation conditions were as follows: molar ratio of Ti to La at 5:1, (NH 4) 2 S 2 O 8 solution concentration of 2.0 mol•L-1 and calcination temperature of 500 o C. STL belonged to the solid superacid (Ho=−13.75) with Brönsted acid sites. The esterification rate of above probe reaction could reach 99.3% at the reaction time of 90 min.