화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Polymer(Korea), Vol.36, No.4, 494-499, July, 2012
Export Citation
다중벽 탄소나노튜브강화 폴리프로필렌 나노복합재료의 전자파 차폐효과 및 기계적 특성
Electromagnetic Interference Shielding Effectiveness and Mechanical Properties of MWCNT-reinforced Polypropylene Nanocomposites
임윤지, 서민강1, 김학용, 박수진2, †
  • 전북대학교 유기소재파이버공학과
  • 1전주기계탄소기술원
  • 2인하대학교 화학과
Yoon-Ji Yim, Min-Kang Seo1, Hak-Yong Kim, and Soo-Jin Park2, †
  • Department of Organic Materials and Fiber Engineering, Chonbuk National University, Jeonju, Jeonbuk 561-765, Korea
  • 1Jeonju Institute of Machinery and Carbon Composites, Jeonju, Jeonbuk 561-844, Korea
  • 2Department of Chemistry, Inha University, Incheon 402-751, Korea
E-mail:
초록
본 연구에서는 다중벽 탄소나노튜브(MWCNT)의 함량을 1에서 10 wt%까지 달리하여 MWCNT 강화 폴리프로필렌(PP) 나노복합재료의 전자파 차폐효과 및 기계적 특성에 미치는 영향에 대해서 살펴보았다. 전기전도도는 4단자법으로 측정하였고, 전자파 차폐효과는 흡수와 반사방법으로 분석하였다. 기계적 특성은 임계응력세기인자(KIC) 측정을 통하여 고찰하였으며, 모폴로지는 주사전자현미경(SEM)으로 관찰하였다. 실험결과, MWCNT의 함량이 증가함에 따라 차폐효과가 향상됨을 확인할 수 있었으며, MWCNT의 함량이 전자파 차폐효과를 결정하는 중요한 요소임을 알 수 있었다. KIC값도 MWCNT의 함량이 증가할수록 큰 값을 가지는 것을 확인할 수 있었으나 5 wt% 이상에서는 오히려 감소하였다. 이는 과량의 MWCNT가 PP 내에서 서로 뭉침으로 인하여 KIC값을 감소시킨 것으로 판단된다.
In this work, the effect of multi-walled carbon nanotube (MWCNT) on electromagnetic interference shielding effectiveness (EMI SE) and mechanical properties of MWCNT-reinforced polypropylene (PP) nanocomposites were investigated with varying MWCNT content from 1 to 10 wt%. Electric resistance was tested using a 4-point-probe electric resistivity tester. The EMI SE of the nanocomposites was evaluated by means of the reflection and adsorption methods. The mechanical properties of the nanocomposites were studied through the critical stress intensity factor (KIC) measurement. The morphologies were observed by scanning electron microscopy (SEM). From the results, it was found that the EMI SE was enhanced with increasing MWCNT content, which played a key factor to determine the EMI SE. The KIC value was increased with increasing MWCNT content, whereas the value decreased above 5 wt% MWCNT content. This was probably considered that the MWCNT entangled with each other in PP due to an excess of MWCNT.
Keywords:elecromagnetic interference (EMI);shielding effectiveness (SE);carbon nanotube (CNT);nanocomposites;thermoplastic.
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