The Preparation And Characterization Of Polyethylene/Montmorillonite Nanocomposites

Much attention has been put on the polymer/montmorillonite nanocomposites owing to it excellent properties. In this thesis, polyethylene was chose and its nanocomposites had been prepared successfully via melt intercalation. Two kinds of polyethylene were chose, which included: high-density polyethylene and crosslinking polyethylene.As to the high-density polyethylene, two strategies were performed: (1) After being modified by grafting polar groups on its backbone, polyethylene and organic montmorillonite were melt mixed directly, which could obtain the polyethylene/montmorillonite nanocomposites. The effect of groups grafted on the backbone on the efficiency of intercalation was investigated in this paper; (2) choosing the grafters obtained in this experiment as the compatilizers, polyethylene/montmorillonite nanocomposites had also been prepared by melt mixing the polyethylene, grafter and organic montmorillonite. The difference of grafters and sequence of mixing on the intercalation result had also been analyzed.As to the crosslinking polyethylene, organic montmorillonite was further modified by attach the monomers on the surface and interlayer of montmorillonite in the way of mixing at a high speed. After the former procedure, the crosslinking polyethylene/montmorillonite nanocomposites had been easily obtained by melt mixing crosslinking polyethylene and the modified montmorillonite directly.XRD and TEM were employed to investigate the intercalate effect. The mechanical properties of the obtained nanocomposites were also test, which showed they didn't have a much improvement. However, the measurement of TGA and DSC showed that the thermal stability of the nanocomposites had improved a lot and the crystal speed had also have a slight improvement.