高分子材料為常用之基材，但機械與電熱性質不佳，需加入補強材改善之。奈米碳管具低比重、高剛性、高強度與優越之物理性質，使其成為極佳之補強材料；奈米碳管同時具有高長徑比與優越之電氣性質，使奈米碳管可應用於電磁屏蔽材料。本研究使用化學氣相沉積法成長之多壁碳管補強熱固性環氧樹脂，探討碳管含量與補強形式對電磁波屏蔽效率、反射與吸收機制、電氣與機械性質之影響。電磁波屏蔽量測結果顯示，加入多壁奈米碳管使材料具有電磁波屏蔽之功能，以平鋪式碳管補強之試片表現尤佳。反射與吸收機制之量測結果顯示，添加碳管使材料之反射比例提升且屏蔽機制以反射為主。電性量測結果顯示，加入多壁奈米碳管可提升材料之導電度，當碳管含量達1.0 wt%時可提升導電度約14~15個數量級。單軸拉伸試驗結果顯示，添加碳管可提升材料之機械性質，平鋪式碳管補強之試片顯示較佳之楊氏模數與拉伸強度。最後以場發射掃描式電子顯微鏡(FESEM)觀察試片破壞面之微觀結構，可見混合製程試片之碳管均勻分散於基材中，以及平鋪製程之層層堆疊顯示平鋪式碳管保留其網狀結構。

Carbon nanotubes (CNTs) were used as the reinforcements in the polymer composites, because of their outstanding physical properties. CNTs were also used in the application of electromagnetic interference (EMI), because of their exceptional electrical properties. In this paper, the multi-walled carbon nanotubes (MWNTs) synthesized by the chemical vapor deposition (CVD) method were used to reinforce the epoxy resin by mixing and spreading processes. The influence of the weight percentage and the reinforced form of MWNTs on electromagnetic interference shielding effectiveness (EMI SE), electrical and mechanical properties were investigated. From experimental results, the EMI SE is improved with increasing content of MWNTs. The composites fabricated by the spreading process have better shielding effectiveness than those by mixing process. The characteristics of EMI shielding change from absorbance to reflectance when the content of MWNTs increases. The electrical conductivity of composites, reinforced by 1.0 wt% of MWNT, increases to 100~1000 Tera □-1-cm-1. The Young’s modulus and the tensile strength of composite reinforced by 2.0 wt% MWNTs, made by the spreading process, increase 81.29% and 30.03% respectively. The network structure of MWNTs, resulting from the spreading process, can be found from the SEM images of the tensile failure surfaces.

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