The objective of this work is to report the effect of carbon nanoparticles on the phase morphology and on the mechanical and thermal properties in the epoxy modified with poly (propylene glycol) -block-poly (ethylene glycol) -block-poly copolymer (PPO-PEO-PPO). The copolymer with 2000 g / mol molar mass has 50% PEO in its blocks, and 3300 g/mol has 10% PEO. The nanoparticles used were carbon nanotubes, graphene and carbon black in a mass fraction of 0.5%. Nanoparticle incorporation did not influence the miscibility of the copolymer on the resin. Spherical/ellipsoidal domains of the 3300g/mol block copolymer dispersed in the 240 ± 20 nm matrix were obtained with and without nanoparticles. The copolymer with 2000 g/mol obtained miscibility in all mixtures. As for the thermal properties, the miscibility of the copolymer in the epoxy matrix reduced the Tg value by 40 ° C, although a 62% increase in fracture resistance (KIC) was observed. The nanoparticles dispersed in the PPO-PEO-PPO2000g/mol copolymer increased TG relative to the non-nanoparticle sample at 30°C. For the samples with the PPO-PEO-PPO3300g/mol copolymer the Young's modulus increased 100% over the non-nanoparticle sample. However, both copolymers with KIC nanoparticles were lower in comparison with the samples without nanoparticles, but in relation to the pure one can reach an increase of 78%. Thus, the nanoparticles minimized the negative effect of the copolymer on the Young's modulus and at the glass transition temperature.