The research progress of polyethylene terephthalate(PET)filling modification and foam forming are reviewed.The main fillers are calcium carbonate,montmorillonite and talc powder.The effects of various fillers on PET properties are introduced.The methods of PET foam forming mainly include intermittent foaming,moulded foaming and extrusion foaming,and the foaming process of these three methods are briefly described.Before foam forming,it is often necessary to modify its chain extension to improve the foamability,and more chain extenders are used,such as anhydride chain extender and epoxy chain extender.The effect of fillers on PET foaming properties are mainly introduced.The addition of fillers can improve the cell density and foaming ratio of PET,or make the cell distribution and size more uniform.The addition of fillers can also improve the elongation at break or optical reflectance of PET foam materials.Finally,the development prospect of PET filling modification and foaming materials are prospected.
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