Abstract
The main goal of this research is to study the influence of interphase region on the Young’s modulus of the CNT-based nanocomposites at microscale. For this purpose, two different categories of interphase resembling normal CNT and functionalized CNT are studied. Normal CNT interacts through non-bonded van der Waals (vdW) interactions with resin; while the functionalized CNT interacts through a combination of non-bonded vdW and covalent interaction with surrounding polymer. Thanks to the induced structural defects into the nano-structure of the CNT after chemical functionalization, the influence of vacancy defects are firstly studied on isolated CNT. Then the Representative Volume Element (RVE) of the CNT-based nanocomposites as microscale consisting of CNT, interphase and surrounding polymer are simulated using semi-continuum mechanics approach. It is revealed that chemical functionalization will reduce the Young’s modulus of the RVE at microscale in comparison with the RVE containing non-defected CNT. The Young’s modulus of the interphase region for the continuum modeling as a very efficient alternative approach of semi-continuum modeling is obtained. Finally, the influence of CNT length on the Young’s modulus of the RVE is studied using continuum method.
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