[Green Chemistry] Controllable preparation of phosphonium-based polymeric ionic liquids as highly se
Phosphonium-based polymeric ionic liquids have controllably prepared by using microfluidic technique within an improved membrane microdevice. By the method, their average diameter sizes could be tuned from 6.4 to 375 nm through varying the dispersed phase flow rates from 1.0 to 7.0 mL/min. The nanoparticles were characterized by FTIR, SEM, HRTEM, EDS, TGA and ICP, and their catalytic properties were estimated in cycloaddition of CO2 with epoxides. It was found they could perform from good to excellent yields with more than 99% selectivities, especially 1-bromoacrylic acid decorated nanoparticles (NPILs-BPA). Additionally, the activity behaved obvious smaller size-dependence and seven times’ recycling stabilities without loss of catalytic activity and selectivity. Meanwhile, NPILs-BPA provided carboxylic acid groups and hydrogen bonding donor to active the ring-opening of epoxides was also tested by in-situ FTIR. This work provided a continuous, simple method for polymeric ionic liquids (PILs) with controlling-nanosizes, and potentially behaved the advantage of being scaled-up and throughput in industrial application.
Ying Liu, Weiguo Cheng, Yanqiang Zhang, Jian Sun and Suojiang Zhang