No abstract

A facile method for solid-phase organic synthesis of 1-(E)-phenylethenyl-4-substituted-1,2,3-triazoles from polystyrene-supported (2-azido-1-phenyl)ethyl selenide and substituted ethynes has been developed. The advantages of this method include straightforward operation, high yield and purity of the products, as well as lack of odour and good stability of the polymeric reagent.

PAI/SiC-and PAI/SiC/PTFE-composite coatings were prepared, which were deposited on Al substrates using spraying technology to improve their surfaces performance. Friction and wear of PAI composite coatings were evaluated on a ball-on-block wear tester, and thermal properties were investigated by TG. It is found that, the friction coefficient and wear rate of PAI coatings reaches the best value when the content of SiC and PTFE is 10 wt % and 0.8wt% respectively, and the friction coefficient of the composites coatings decrease but the wear rate increase with increasing applied load; TG curves shows that the PAI composite coatings have excellent heat resistance. Furthermore, the surface of PAI coatings is perfect without bubbling, desquamating and cracking when it is heated for 2 hour at 250◦C in turn three cycles.