The effect of interfacial adhesion between multiwalled carbon nanotubes (MWCNTs) and the polypropylene (PP) matrix on the gel-like behaviour of the MWCNT/PP is studied. Two kinds of composites with different nanotubepolymer interactions, e.g. MWCNT/polypropylene-grafted-maleic anhydride (PP-g-MA)/polypropylene and functionalized MWCNT (MWCNT-COOH)/PP-g-MA/PP, are prepared by melt mixing. The two composites exhibit significant differences in morphological and rheological properties. The

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... ambon method is successfully demonstrated as an effective tool to study the gel-like behavior and percolation threshold of CNT/polymer composite systems. This method accurately reveals the gel content (c g ) and quantitatively provides the gel strength S g and exponent n of the two composites, which proves that the increased interfacial adhesion between MWCNT-COOH and the polymer matrix served a key for changing the rheological properties.