Journal
POLYMER INTERNATIONAL
Volume 62, Issue 11, Pages 1575-1582Publisher
WILEY
DOI: 10.1002/pi.4550
Keywords
nitrile rubber composites; ionic liquids; silica; MgAl-LDH; ionic conductivity
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Funding
- European grant
- Erasmus project for PhD students
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We investigated the influence of hydrophilic and hydrophobic imidazolium ionic liquids on the curing kinetic, mechanical, morphological and ionic conductivity properties of nitrile rubber composites. Two room temperature ionic liquids with a common cation1-ethyl-3-methylimidazolium thiocyanate (EMIM SCN; hydrophilic) and 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (EMIM TFSI; hydrophobic)were used. Magnesium-aluminium layered double hydroxide (MgAl-LDH; also known as hydrotalcite) was added to carboxylated acrylonitrile-butadiene rubber (XNBR) whereas fumed silica Aerosil 380 was used in acrylonitrile-butadiene rubber (NBR) as reinforcing fillers. NBR compounds were vulcanized with a conventional sulfur-based crosslinking system whereas XNBR compounds were cured with MgAl-LDH. The optimum cure time reduction and tensile properties improvement were obtained when both ionic liquids were added at 5 parts per hundred rubber (phr). The results revealed that EMIM SCN and EMIM TFSI induced an increase in the AC conductivity of nitrile rubber composites from 10(-10) to 10(-8) and to 10(-7) Scm(-1), respectively (at 15 phr ionic liquid concentration). The presence of ionic liquids in NBR slightly affected the glass transition temperature (T-g) whereas the presence of EMIM TFSI in XNBR contributed to a shift in T-g towards lower temperatures from -23 to -31 degrees C, at 15 phr loading, which can be attributed to the plasticizing behaviour of EMIM TFSI in the XNBR/MgAl-LDH system. Dynamic mechanical analysis was also carried out and the related parameters, such as the mechanical loss factor and storage modulus, were determined. (c) 2013 Society of Chemical Industry
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