Highly tough composite materials.

摘要

Prepregs consisting of a fibre-reinforced resin having separate phase fine resin particles layers of fine particles distributed throughout the prepregs, as well as prepregs for making fibre-reinforced resin laminates having as a separate phase resin particles of which 90 % or more lie in interlayer zones which are not greater in width than 30 % of the width of each layer forming the laminate. The first type of prepreg is prepared by combining a mixture of matrix resin and fine resin particles with reinforcing fibres, while the second type of prepreg is prepared by making a first mixture of reinforcing fibres and matrix resin, and sprinkling resin particles thereon, or alternatively making a second mixture of matrix resin and resin particles and then applying the second mixture to one or both faces of the first mixture. In a particular embodiment the resin particles may be composed of a combination of a thermosetting resin and a thermoplastic resin which has, or can develop, a semi-interpenetrating polymer network structure.