Influence of Surface Polarity on Catalytic Properties of Aminopyridine Functionalized Polyacrylonitrile Fiber Catalyst

Abstract

This work has been developed to study the effect of fiber catalyst surface polarity on catalyst performance. Taking 4-dimethyl amine pyridine (DMAP) derivative functionalized polyacrylonitrile fiber catalyst (PANDMAPF) as the template catalyst, its surface property was adjusted through the introduction of phenyl and hydroxyl groups on PANDMAPF. Elemental analysis (EA), Fourier-transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and mechanical strength test are used to characterize and demonstrate the successful synthesis of different fiber catalysts. The catalytic performance of different fiber catalysts was tested by the reaction of one-pot three-component synthesis 2-amino-2-chromenes. The results showed that reducing the surface polarity of the catalyst could not only improve the activity of the catalyst, but also make the three-component reaction which could only be carried out in high polar solvents (water and methanol), but also proceed effectively in lower polar solvents (such as ethanol and n-butanol). Therefore, the activity and selectivity of the catalyst can be effectively regulated by introducing different polar auxiliary functional groups on the surface of the fiber catalyst, which provides a theoretical basis for the design and synthesis of high activity and selectivity fiber catalyst.