Effect
of the modification of silica on thermal properties and flammability of cross-linked
butadiene-acrylonitrile rubbers |
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| Authors: | G Janowska P Rybiński R Jantas |
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| Institution: | (1) Faculty of Chemistry, Institute of Polymer and Dye Technology, Technical University of Łódź, Łódź, Poland;(2) Faculty of Textile Engineering and Marketing, Department of Physical Chemistry of Polymers, Technical University of Łódź, Łódź, Poland |
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| Abstract: | The paper presents the results of testing
the thermal stability and flammability of butadiene-acrylonitrile rubber vulcanizates
with different contents of combined acrylonitrile: Perbunan NT 1845 and Perbunan
NT 3945 from Bayer, containing unmodified and bromine- or iodine-modified
silica. The test results were obtained with the use of a derivatograph, measurements
of flammability by the method of oxygen index, in air and also with the use
of a cone calorimeter. The effect of the modification on the zeta potential
was also examined.
A considerable reduction in the flammability
of nitrile rubber vulcanizates filled with silica can be obtained by the modification
of filler with bromine or iodine. All the vulcanizates containing modified
silica are self-extinguishing. An appropriate filling of NBR 39 vulcanizates
with bromine-modified silica makes it possible to obtain non-flammable polymeric
materials. They neither ignite nor glow under the action of a flame source
for 30 s.
The findings can be a rational basis for the synthesis
of modified silica that can act as active filler and effective flame-retardant
agent at the same time. |
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| Keywords: | cone calorimeter analysis fillers flammability nitrile rubber oxygen index silica thermal analysis thermal stability thermal transitions |
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