Morphology and Properties of Aminosilane Grafted MWCNTPolyimide Nanocomposites

الملخص EN

This investigation presents a novel method for modifying multiwalled carbon nanotubes (MWCNTs).

The morphology, electrical resistivity, and percolation threshold of MWCNT/Polyimide nanocomposites were studied.

Acid-modified MWCNTs reacted with (3-aminopropyl)triethoxysilane by ionic bonding, and were then mixed with polyamic acid via imidization.

TEM microphotographs reveal that silane-grafted MWCNTs were connected to each other.

The electrical resistivity of silane-grafted MWCNT/polyimide decreased substantially below than that of acid-treated MWCNTs when the silane-modified MWCNT content was lower than 2.4 wt%.

The percolation threshold of the MWCNT/polyimide composites is 1.0 wt% for silane-modified MWCNT and exceeds 7.0 wt% for acid-modified MWCNT.

The acid-modified MWCNT/polyimide composites possess slightly higher glass transition temperatures than that of pure polyimide.

The glass transition temperature of the polyimide increased significantly with silane-modified MWCNT content.

Tensile properties of the polyimide have been improved with the MWCNTs content.