A Study on PTC/NTC Behavior of Fluorinated Carbon Black-filled HDPE Matrix Compounds 


Vol. 47,  No. 2, pp. 147-0, Apr.  2003
10.5012/jkcs.2003.47.2.147


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  Abstract

본 연구에서는 PTC 소자의 NTC 현상을 제거하기 위하여 카본블랙을 0.1-0.4 MPa의 압력으로 불소처리 한 후 이를 이용하여 카본블랙/HDPE 전도성 컴파운드를 제조하였다. 불소처리한 카본블랙의 표면특성 변화는 FT-IR, XPS 그리고 접촉각 측정을 통하여 확인하였다. FT-IR실험 결과, 불소처리된 카본블랙은 1400-1000 cm-1 영역에서 C-F 피크를 나타내며 처리압력이 증가할수록 C-F 피크의 세기가 증가함을 확인할 수 있었다. 또한, XPS 분석을 통해 불소처리 압력이 증가할수록 카본블랙 내의 불소의 함량이 증가함을 확인하였다. 그러나, 불소처리된 카본블랙의 표면자유에너지는 처리압력이 증가할수록 감소하였다. 결과로서, 카본블랙의 불소 처리를 통해 카본블랙/HDPE 컴파운드의 NTC 현상이 사라졌는데, 이는 카본블랙의 표면자유에너지 감소가 수지의 융점 이후 일어나는 카본블랙 입자간의 재결합을 방해하기 때문이라 사료된다. In this study, the fluorinated carbon blacks(CB) were used to reduce the negative temperature coefficient (NTC) phenomenon of the CB-filled high density polyethylene(HDPE) compounds in the fluorination pressure of 0.1-0.4 MPa. The changes in surface properties of the CB were investigated by using FT-IR, XPS and contact angle measurements. From the FT-IR results, the fluorinated CB showed the C-F absorption peak at 1400-1000 cm-1 and the peak intensity was increased with increasing the fluorination pressure. Also, the analysis of XPS spectra of the fluorinated CB indicated that fluorine content was increased with increasing the fluorination pressure. Meanwhile, the surface free energy of the fluorinated CB was decreased with increasing the fluorination pressure. Consequently, the increase of fluorine contents on CB made a disappearance of NTC behaviors of CB/HDPE compounds, which was probably due to the reduction of CB reaggregation after melting point of the HDPE, resulting from decreasing the surface free energy of CB particles.

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  Cite this article

[IEEE Style]

S. Park, S. Song, M. Seo, J. Shin, K. Kim, "A Study on PTC/NTC Behavior of Fluorinated Carbon Black-filled HDPE Matrix Compounds," Journal of the Korean Chemical Society, vol. 47, no. 2, pp. 147-0, 2003. DOI: 10.5012/jkcs.2003.47.2.147.

[ACM Style]

Soo-Jin Park, Su-Wan Song, Min-Kang Seo, Jae-Sup Shin, and Kyuchul Kim. 2003. A Study on PTC/NTC Behavior of Fluorinated Carbon Black-filled HDPE Matrix Compounds. Journal of the Korean Chemical Society, 47, 2, (2003), 147-0. DOI: 10.5012/jkcs.2003.47.2.147.

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