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Experimental and Numerical Investigations of Polymer Nanocomposites

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Title
Experimental and Numerical Investigations of Polymer Nanocomposites
Author
Kong, Kyungil
Advisor
Park, Hyung Wook
Keywords
Mori-Tanaka Model; Representative Volume Element (RVE) Model; Epoxy-CNTs Nanocomposites; PDMS-CNTs Nanocomposites; Three roll milling method; Representative Volume Element (RVE) FEM Simulation; Carbon Nanotubes (CNTs); Silicone Rubber Nanocomposites
Issue Date
2011-08
Publisher
Graduate School of UNIST
Abstract
Carbon nanotubes(CNTs) have excellent mechanical, electrical, and thermal properties. Embedding carbon nanotubes to the polymer matrix improve material properties as a role of reinforcements in polymer nanocomposites. In this research, the effect of CNT-integration in polymer nanocomposites was studied theoretically and experimentally. In order to understand the material properties of polymer nanocomposites, researchers have conducted diverse methods to evaluate the mechanical properties. In this study, elastic modulus of epoxy-CNTs nanocomposites was investigated by numerical approach and finite element method (FEM) approach. Modeling of polymer nanocomposites was studied by using representative volume element (RVE) model. On the other hand, numerical approach was worked by Mori-Tanaka algorithm in Matlab. In this study, finite element method (FEM) simulation and numerical analysis for epoxy-CNTs nanocomposites were investigated. Numerical analysis was proper model to determine mechanical property such as elastic modulus for nanocomposites than FEM simulation. The more CNTs wt.% in the polymer matrix was, the higher elastic modulus was indicated. Even more, the elastic modulus of uni-directionally aligned CNTs was higher than randomly oriented CNTs. These characteristics were responded to the numerical analysis and FEM simulation. In this study, good dispersion of the CNTs and strong bonding between the CNTs and polymer matrix are necessary to improve the mechanical properties of nanocomposites. On the other hand, it was introduced how to manufacture the high viscosity medium bonded with CNTs. In this study, three roll milling method is well to disperse CNTs in the high viscosity medium. By making CNTs-polydimethylsioxane(PDMS) nanocomposites, the successful manufacture process was introduced.
Description
System Design and Manufacturing
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