Radiation processing is proposed as an alternative methodology to cure composite materials for aerospace and advanced automotive applications. With respect to thermal curing, the most attractive aspect of this process lies in the fact that it does not need thermal activation, so that it can be performed near room temperature. This brings several positive consequences such as energy costs saving, the use of low cost moulds and the improvement of mechanical properties of the cured materials due to the reduced residual thermal stresses. Furthermore radiation curing, conversely to thermal curing, does not need the use of toxic hardeners but only the presence of a very small quantity of acidic salt as initiator. This fact, together to the reduced volatile emission caused by the use of low temperatures, makes radiation curing an environmentally friendly process. Other advantages are the great flexibility of the process and the short curing times . On the other hand, during radiation curing the temperature of the system can undergo to a significant increase due to the occurring of both exothermic polymerization reactions and radiation absorption. The extent of this phenomenon depends, for fixed components and geometry of the mould, on the component ratio and on the rate by which the energy is provided to the sample, that is the irradiation dose rate of the process. The occurrence of a not expected heating causes a simultaneous thermal curing during irradiation, invalidating the beneficial effects coming out from a not thermally activated process. It is well known that epoxy resins matrices have a high stiffness, but generally suffers from poor fracture toughness. Considering that for advanced applications they are required to show at the same time high toughness, high thermal resistance (high Tg) and high stiffness, the toughening of these matrices, without worsening the other properties, is a crucial step. The most used toughening method consists on the introduction of engineering thermoplastics, having both high elastic modulus and high Tg. Starting from an “homogeneous” blend, the occurring of separation phase phenomena between the resin and the thermoplastic gives rise to a specific morphology whose characteristics determine the distribution of stresses in the material and hence its fracture mechanisms. To this regard, the study of the morphological structure of these systems is essential and considering that the morphology results not only from the components nature and their ratio, but also from the process, it is evident that a great effort has to be devoted to the individuation of the optimal choice of all the parameters governing the process. It is well known from literature, concerning thermally cured epoxy systems, that co-continous type morphology at a nano-micro metric scale is very effective in improving fracture toughness, but the design of a material having specific mechanical features, tailored for specific applications, is not easy to perform, especially when several parameters are introduced in the process, such as in the case of radiation curing. In this communication the radiation curing of epoxy-thermoplastic blends, in order to produce polymer matrices for carbon fibre composites, is presented. In particular, the influence of the blend formulation and of the processing conditions on the structure, morphology and thermal and mechanical properties of the cured materials is discussed.