Yuen, Siu-Ming and Ma, Chen-Chi M. and Lin, Yao-Yu and Kuan, Hsu-Chiang (2006) Preparation, morphology and properties of acid and amine modified multiwalled carbon nanotube/polylmide composite. COMPOSITES SCIENCE AND TECHNOLOGY, 67 (11-12). pp. 2564-2573.
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The precursor of polyimide, polyamic acid, was prepared by reacting 4,4′-oxydianiline (ODA) with 3,3′,4,4′-benzophenone tetracarboxylic dianhydride (BTDA). Unmodified, acid-modified and amine-modified multiwall carbon nanotubes (MWCNT) were separately added to the polyamic acid and heated to 300 °C to produce polyimide/carbon nanotube composite. Scanning electron microscopic (SEM) and transmission electron microscopic (TEM) microphotographs reveal that acid-modified MWCNT and amine-modified MWCNT were dispersed uniformly in the polyimide matrix. The effect of the acid and amine-modified MWCNTs on the surface and volume electrical resistivities of MWCNT/polyimide composites were investigated . The surface electrical resistivity of the nanocomposites decreased from 1.28 × 1015 Ω/cm2 (neat polyimide) to 7.59 × 106 Ω/cm2 (6.98 wt% unmodified MWCNT content). Adding MWCNTs influenced the glass transition temperatures of the nanocomposites. Modified MWCNTs significance enhanced the mechanical properties of the nanocomposites. The tensile strength of the MWCNT/polyimide composite was increased from 102 MPa (neat polyimide) 134 MPa (6.98 wt% acid modified MWCNT/polyimide composites).
|Uncontrolled Keywords:||carbon nanotube; polyimide; morphology; electrical properties; thermal properties; mechanical properties|
|Subjects:||Material Science > Functional and hybrid materials|
Material Science > Nanostructured materials
Material Science > Nanochemistry
|Deposited By:||Anuj Seth|
|Deposited On:||26 May 2009 15:54|
|Last Modified:||26 May 2009 15:54|
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