Preparation and evaluation of polymeric nanocomposites based on EVA/montmorillonite, EVA/palygorskite and EVA/halloysite as pour point depressants and flow improvers of waxy systems

•EVA:clay mineral nanocomposites present good performance to decrease oil viscosity.•EVA:palygorskite nanocomposites present high performance as pour point depressant.•Palygorskite contribute to crystal steric hindrance by inducing electrical charge.•Nanocomposites modify crystals of waxes presenting different molecular weights.•Nanocomposites performance depends on their composition and preparation method.