Desenvolvimento de nanocompósitos híbridos de epóxi/NTCPM/cargas minerais e avaliação das propriedades mecânicas, elétricas e térmicas
Abstract
In the present work epoxy/ MWCNT/ mineral fillers nanocomposites were
obtained using ultrasonication and calendering. The effect of addition of mineral
filler (calcium carbonate, montmorillonite and sepiolite) in electrical, mechanical
and thermal properties of epoxy/ MWCNT were analyzed. Two different CNT
were studied, with different aspect ration and purity, however only Nanocyl
CNT’s presented improvement in the nanocomposites electrical properties and
for that reason was employed for hybrid epoxy/ MWCNT/ mineral
nanocomposites production. The electrical percolation threshold was
determined as 0.04 wt% and for 0.3 wt% the electrical conductivity reached
1.29X10-2 S/m. The addition of calcium carbonate and montmorillonite improved
electrical conductivity for epoxy nanocomposites produced with 0.05 wt% CNT
and the same behavior was observed for epoxy/ MWCNT / sepiolite
nanocomposites at 0.1 wt% CNT. The epoxy/ MWCNT nanocomposite at
0.05% CNT when produzed via calendering presented improvement in the
electrical conductivity compared to the same nanocomposite produced via
ultrasonication. For epoxy/ MWCNT at 0.05 wt% of CNT, the addition of calcium
carbonate in the nanocomposite led to an electrical conductivity 1 decade
higher than the epoxy/ 0.05 wt% CNT nanocomposite produced via calendering.
The mineral fillers also modified thermal and mechanical behavior of the
nanocomposites, and improvements in flexural modulus, thermal stability and Tg
were observed.
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