Remarkable selective localization of modified nanoscaled carbon black and positive temperature coefficient effect in binary-polymer matrix composites
Academic and industrial research groups are currently working on materials with high-quality positive temperature coefficient (PTC) effects. They are crucial for designing new switching sensors, self-regulating heaters and shielding structures. Such materials are in fact the basis for a new generati...
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Published in | Journal of materials chemistry Vol. 18; no. 23; pp. 2685 - 2690 |
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Main Authors | , , , |
Format | Journal Article |
Language | English |
Published |
Cambridge
Royal Society of Chemistry
01.01.2008
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Subjects | |
Online Access | Get full text |
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Summary: | Academic and industrial research groups are currently working on materials with high-quality positive temperature coefficient (PTC) effects. They are crucial for designing new switching sensors, self-regulating heaters and shielding structures. Such materials are in fact the basis for a new generation of cheap and large sensors. Here we present a robust and simple procedure to prepare binary-polymer matrix composites with strong PTC effect through melt-mixing and subsequent hot-pressing technology. The intuitive and detailed double-percolation structure is observed on the basis of morphological evidence. Modified nanoscaled carbon black (MNCB) is often selectively localized in one of the binary-polymer phases. When the volume ratio of the two polymers is very close to 1 : 1, we observe remarkable PTC intensity (PTCI), namely PTCI = 3.3 X 107 in MNCB-high density polyethylene/polypropylene (MNCB-HDPE/PP) and PTCI = 8.3 X 107 in MNCB-HDPE/polyvinylidene fluoride (MNCB-HDPE/PVDF). The process for the preparation of these binary-polymer matrix PTC composites is suitable for industrial mass production. |
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Bibliography: | ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23 |
ISSN: | 0959-9428 1364-5501 |
DOI: | 10.1039/b717591d |