Progress in Interface Reinforcement of Polypropylene Composites
Polypropylene is a kind of excellent thermoplastic general purpose resin,which has transparent,light weight,heat resistance,electrical insulation,and good processing properties,and is widely used in fiber products,auto parts,pipeline,packaging materials,and other fields.Compared with epoxy resin and other polar materials,the interfacial compatibility of polypropylene composites is poor,so the study of interfacial strengthening of polypropylene composites is particularly important.This paper analyzes the research on interface strengthening of polypropylene composites in ten years,and summarizes five interface bonding mechanisms,including chemical bonding theory,mechanical interlock theory,interface diffusion theory,interface infiltration theory,and interface crystallization theory.The interfacial enhancement methods such as sizing agent/coating treatment,'multi-scale'modification of filler surface by nano-materials,molecular self-assembly,and polypropylene matrix modification that induces interfacial crystallization are reviewed.Finally,the future opportunities and challenges of interfacial research on polypropylene composites are prospected.
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