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Resistivity and Thermal Reproducibility of the Carbon Black and SnO 2 /Sb Coated Titanium Dioxide Filled Silicone Rubber Heaters
Author(s) -
Park EunSoo
Publication year - 2005
Publication title -
macromolecular materials and engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.913
H-Index - 96
eISSN - 1439-2054
pISSN - 1438-7492
DOI - 10.1002/mame.200500214
Subject(s) - materials science , acicular , scanning electron microscope , composite material , silicone rubber , carbon black , titanium dioxide , micrograph , reproducibility , silicone , particle size , natural rubber , chemical engineering , microstructure , statistics , mathematics , engineering
Summary: Flexible heaters were prepared by extruding platinum‐catalyzed silicone rubber compound with electroconductive carbon black (CB) and SnO 2 /Sb coated titanium dioxide (TiO 2 ). Two types of acicular‐shaped TiO 2 with average particle sizes of 1.7 and 5.2 µm, and two types of spherical‐shaped TiO 2 with average particle sizes of 0.3 and 2.5 µm were selected. Thermoelectric switching phenomena were investigated for the silicone rubber/CB/TiO 2 system. Positive temperature coefficient (PTC) was significant when the acicular filler was added rather than spherical ones. Resistivity change and thermal reproducibility of the extruded heaters were also investigated by applying periodically AC voltage of 220 V. The heaters containing acicular‐shaped TiO 2 exhibited excellent electrical reproducibility.Scanning electron micrograph of the fractured surface of the extruded composites.