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2004•Journal of Functional PolymersRequires access

Studies of the Graft-modified Polypropylene and Its Foaming in Extrusion

Anna Zheng

Open publisher page 1 citations

Abstract

With organic peroxide as initiator, melt polypropylene(PP) was grafted with unsaturated linear polyester(ULP) in the twin-screw extruder. By means of FT-IR, DSC, gel content testing, it is proved that the grafting reaction occurrs on PP in extrusion. The results of rheological behavior testing and melt flow rate(MFR) show that PP's rheological performance is improved effectively by graft-modification. The foaming process for raw polypropylene and grafted polypropylene was also studied in twin-screw extruder. It is showed by SEM that grafted polypropylene has more excellent foaming effect than PP.

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What this paper is about

With organic peroxide as initiator, melt polypropylene(PP) was grafted with unsaturated linear polyester(ULP) in the twin-screw extruder. By means of FT-IR, DSC, gel content testing, it is proved that the grafting reaction occurrs on PP in extrusion. The results of rheological behavior testing and melt flow rate(MFR) show that PP's rheological performance is improved effectively by graft-modification. The foaming process for raw polypropylene and grafted polypropylene was also studied in twin-screw extruder. It is showed by SEM that grafted polypropylene has more excellent foaming effect than PP.

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Available abstract

With organic peroxide as initiator, melt polypropylene(PP) was grafted with unsaturated linear polyester(ULP) in the twin-screw extruder. By means of FT-IR, DSC, gel content testing, it is proved that the grafting reaction occurrs on PP in extrusion. The results of rheological behavior testing and melt flow rate(MFR) show that PP's rheological performance is improved effectively by graft-modification. The foaming process for raw polypropylene and grafted polypropylene was also studied in twin-screw extruder. It is showed by SEM that grafted polypropylene has more excellent foaming effect than PP.

Key concepts: Polypropylene, Plastics extrusion, Materials science, Reactive extrusion, Extrusion, Rheology, Composite material, Melt flow index

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