Electrical conductivity of PUR/MWCNT nanocomposites in the molten state, during crystallization and in the solid state

摘要: Abstract The electrical conductivity of a nanocomposite constituted multiwalled carbon nanotubes (MWCNT) dispersed in semicrystalline polyurethane matrix, is investigated during cooling from the melt to solid state. same percolation threshold, ϕ c  = 0.85 wt.%, obtained molten and state, although exponent t equation significantly higher A remarkable increase crystallization observed for nanocomposites MWCNT content above , but contents below decreases. Combined PVT results, lead us discard hypothesis an density conductive network (associated with volume shrinkage) as being cause enhancement crystallization. Instead, analysis parameters suggests transition less effective more performing three dimensional network.