Study on the Thermo-Oxidative Aging Behaviors of Polypropylene Filled with the High-Content Talcum Powder
The introduction of talcum powder is one of the important methods to improve the modulus of polypropylene.The results show that the introduction of talcum powder has a significant effect on the thermo-oxidative aging life of polypropylene treated at 150℃.With the content of talcum powder increases,the thermal aging life of modified polypropylene decreases,thermal aging shows a little deterioration on tensile strength,while the impact strength increases at first and then decreases in the process of thermal aging.X-ray diffraction(XRD),differential scanning calorimetry(DSC)and gel permeation chromatography(GPC)were used to investigate the changes of molecular weight,crystallinity and filler/resin interface structures in the process of thermo-oxidative aging.The results show that the impact strength and thermo-oxidative aging life are decreased by introducing talcum powder,which is due to the recrystallization and interfacial debonding of polypropylene.
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