首页|Dispersion and its relation to carbon nanotube concentration in polyimide nanocomposites

Dispersion and its relation to carbon nanotube concentration in polyimide nanocomposites

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  • NETL
  • NSTL
  • Elsevier
Characterization of Carbon Nanotube (CNT) dispersion in a polyimide matrix and its effect on nanocom-posite mechanical properties is presented in this paper. CNT bundle aspect ratio, measured by voltage-contrast scanning electron microscopy, is determined to be the quantitative measurement of dispersion and is found to decrease with increase in nanotube concentration. The reduction of CNT bundle aspect ratio with concentration is shown to explain the less effective reinforcement observed in composites as CNT concentration is increased beyond the electrical percolation concentration. It is shown that increase in CNT concentration beyond percolation concentration does not yield proportional improvement in elastic modulus because CNT aspect ratio systematically decreases as concentration increases. A modified Cox micromechanical model that accounts for the actual nanotube bundle aspect ratio as a function of concentration, nanotube waviness and orientation is shown to predict the observed nanocom-posite elastic modulus dependence upon concentration.

A. Carbon nanotubesA. NanocompositesB. Mechanical propertiesC. ModelingD. Scanning electron microscopy (SEM)

C. Rocio Misiego、R. Byron Pipes

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School of Chemical Engineering, Purdue University, West Lafayette, IN 47907-2045, United States,SABIC, Ota. Cartagena-Alhama de Murcia km. 13, 30390 La Aljorra, Cartagena, Murcia, Spain

School of Chemical Engineering, Purdue University, West Lafayette, IN 47907-2045, United States,Schools of Materials Engineering, Aeronautics and Astronautics, Purdue University, West Lafayette, IN 47907, United States

2013

10.1016/j.compscitech.2013.05.011

Composites science and technology

Composites science and technology

EISCI
ISSN：0266-3538
年,卷(期)：2013.85(Aug.)
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