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http://dx.doi.org/10.5012/jkcs.2003.47.2.147

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

Soo-Jin Park (Advanced Materials Division, Korea Research Institute of Chemical Technology)
Su-Wan Song (Advanced Materials Division, Korea Research Institute of Chemical Technology)
Min-Kang Seo (Advanced Materials Division, Korea Research Institute of Chemical Technology)
Jae-Sup Shin (Department of Chemisty, Chungbuk National University)
Kyuchul Kim (Shinwha Intertek Co.)
Publication Information
Journal of the Korean Chemical Society / v.47, no.2, 2003 , pp. 147-154 More about this Journal
Abstract
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.
Keywords
Negative Temperature Coefficient(NTC); Fluorination; Surface Free Energy; Reaggregation;
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