Increasing the efficiency of intumescent flame retardant polypropylene catalyzed by polyoxometalate based ionic liquid

A highly efficient intumescent flame retardant (IFR) system for polypropylene is constructed by adding a polyoxometalate based ionic liquid (PIL) into conventional PP/IFR composites. The PP composite with 14.5 wt% IFR and 0.5 wt% PIL can pass the UL-94 V-0, while that for single IFR is more than 25 wt%.