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Electrical Properties of Nanostructured Carbon Black-filled HDPE Composites: Effect of Electron Beam Irradiation on PTC Characteristics  

박수진 (한국화학연구원 화학소재연구부)
송수완 (한국화학연구원 화학소재연구부)
서민강 (한국화학연구원 화학소재연구부)
이재락 (한국화학연구원 화학소재연구부)
Publication Information
Composites Research / v.16, no.1, 2003 , pp. 19-25 More about this Journal
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.
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