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Numerical Analysis of the Complex Permittivity of MWNT added Epoxy Depending on Agglomeration Size

에폭시 내부의 MWNT 응집 크기에 따른 복소유전율 변화의 해석적 관찰

  • Received : 2014.08.14
  • Accepted : 2014.10.29
  • Published : 2014.10.31

Abstract

This paper predicts the complex permittivity of MWNT added epoxy depending on agglomeration by numerical analysis. 1wt% MWNT added epoxy specimen is prepared using 3-roll-mill method and its complex permittivity is measured in X-band (8.2~12.4 GHz) using freespace measurement system. The analytic model is comprised of cube epoxy and perfect sphere agglomeration. The complex permittivity of the agglomeration model is predicted by complex permittivity mixing rule using the measured complex permittivity of epoxy and 1 wt% MWNT added epoxy. Commercial electromagnetic analysis software, CST, is used to obtain S-parameter of the analytic model and MATLAB code is used to calculate complex permittivity from the S-parameter. It is confirmed that the complex permittivity increases when the agglomeration size decreases.

Acknowledgement

Supported by : 국방과학연구소

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