Abstract: The invention relates to a method for preparing submicronic particles of a thermoplastic polymer encapsulating nanoparticles, said submicronic particles being obtained by nanoprecipitation. The invention also relates to submicronic particles of a polymer encapsulating nanoparticles obtained by said method, and to the use of submicronic particles for making materials reinforced by nanoparticles.

Abstract: The invention concerns a method for making polymeric extruded composite products and carbon nanotubes. Said method includes the following steps: a) performing an oxidation pretreatment of the carbon nanotubes; b) dispersing the nanotubes in a polymer solution; c) extruding the resulting dispersion into an intermediate product; d) drying said intermediate product; e) post-treating said dried intermediate product by hot drawing process; f) post-treating said dried intermediate product of said drawn intermediate product by drawing in an ionic solution; g) performing a formalizing treatment process: Steps e) f) and g) are optional. The extruded polymeric products obtained by the inventive method can contain up to 80 wt. % of nanotubes.