Composites Research

The Korean Society for Composite Materials (한국복합재료학회)
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Electrical Properties of Nanostructured Carbon Black-filled HDPE Composites: Effect of Electron Beam Irradiation on PTC Characteristics

나노구조 카본블랙/HDPE 복합재료의 전기적 특성: 전자선 조사에 의한 PTC 특성변화

  • 박수진 (한국화학연구원 화학소재연구부) ;
  • 송수완 (한국화학연구원 화학소재연구부) ;
  • 서민강 (한국화학연구원 화학소재연구부) ;
  • 이재락 (한국화학연구원 화학소재연구부)
  • Published : 2003.02.01
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Abstract

In this paper, electrical properties of nanostructured carbon blacks (CB)-filled high density polyethylene (HDPE) composites were investigated as a function of temperature, which were prepared by the conventional melt-mixing method. The composites were irradiated with electron beam in a dosage of 30∼150 kGy to enhance an electronical reproducibility and to reduce a negative temperature coefficient (NTC) phenomenon. And, gel contents (%) of irradiated CB/HDPE composites were estimated by solvent extraction method. From the experimental results. the positive temperature coefficient (PTC) intensity of the composites was strongly depended on the CB content and particle size. And, the increase of gel contents (%) and disappearance of NTC behavior of the composites were identified at a dosage of 60 kGy. It was also found that the electron beam irradiation made an improvement of electrical reproducibility of the composites. This result was probably due to the reduction of the freedom of CB movement at above the melting temperature of the polymer crystalline, resulting in increasing the crosslinking structure of the composites.

본 연구에서는 나노구조를 갖는 카본블랙이 충전된 CB/HDPE 복합재료를 용융 혼합법으로 제조한 후 온도변화에 따른 전기적 특성을 고찰하였다. 복합재료의 전기적 재현성 향상과 negative temperature coefficient (NTC) 현상의 제거를 위하여 전자선을 30-150 kGy로 조사하였으며, 조사된 복합재료의 가교함량 분석은 용매 추출법을 이용하였다. 실험결과, CB/HDPE 복합재료의 PTC 세기는 카본블랙의 함량과 입자크기에 크게 영향을 받으며. 가교함량의 급격한 증가에 따른 NTC 현상의 제거는 전자선 흡수선량이 60 kGy일 때였다. 또한 전자선 조사를 통하여 전기적 재현성이 향상되었는데, 이는 복합재료의 가교도 증가에 따른 수지의 용융온도 근처에서의 카본블랙 유동성의 감소 때문이라 사료된다.

Keywords

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