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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Bibliographic Details
Published inJournal of materials chemistry Vol. 18; no. 23; pp. 2685 - 2690
Main Authors XU, Hai-Ping, DANG, Zhi-Min, SHI, Dong-Hai, BAI, Jin-Bo
Format Journal Article
LanguageEnglish
Published Cambridge Royal Society of Chemistry 01.01.2008
Subjects
Applied sciences
Engineering Sciences
Exact sciences and technology
Forms of application and semi-finished materials
Micro and nanotechnologies
Microelectronics
Miscellaneous
Polymer industry, paints, wood
Technology of polymers
Industrial production
Polyethylene
Carbon black
High density
Propylene polymer
Measurement sensor
Temperature effect
Polymer
Fluorides
High temperature
Switching
Hot pressing
Temperature coefficient
Percolation
Nanocomposite
Localization
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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.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
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content type line 23
ISSN:0959-9428
1364-5501
DOI:10.1039/b717591d