Abstract: PP/nano-clay composites were prepared based on two different PP and various contents of compatibilizer PP-g-MAH on a twin-screw extruder.XRD curbes showed that the resultant composites exhibited intercalation structure,and PP matrixes and contents of the compatibilizer PP-g-MAH affected their intercalation structure.Sag resistance experiment indicated that the sag resistance of the composites changed with the intercalation structure.Neither large layer space nor small layer space of the clay is 2.90~3.00 nm,the sag resistance of the PP/nano-clay composite reached its highest value.

Key words: polypropylene, nano-clay, intercalation, sag resistance