Due to the incompatibility between PP and natural plant fibers

the performance of WPC is not very ideal

which has become a hot research object in recent years

including the pretreatment of natural plant fibers

the addition of inorganic particles/fibers and the addition of compatiblers. Pretreatment of natural plant fibers can break the hydrogen bonds in the fiber network structure

remove the wax and oil covering the surface of fibers

increase the surface roughness of fibers

and improve the physical connection between fiber and polymer; adding inorganic particles/fibers can improve the thermal

mechanical and flame retardant properties of WPC; the addition of compatibilizer can enhance the interface connection in WPC and improve the performance of WPC. The research status of polypropylene base WPC in recent five years is reviewed

providing reference for the preparation of cost-effective polypropylene base WPC.