| 摘要 |
A method for the preparation of prepregs comprises I. IMPREGNATING A FIBROUS REINFORCING MATERIAL WITH A LIQUID COMPOSITION CONTAINING AN EPOXIDE RESIN, A PHOTOPOLYMERIZABLE COMPOUND, AND WITH A HEAT-ACTIVATED CURING AGENT FOR EPOXIDE RESINS, AND II. IN THE ABSENCE OF A SUBSTANCE WHICH GIVES RISE TO A SUBSTANTIAL DEGREE OF PHOTOINDUCED POLYMERIZATION THROUGH CONSUMPTION OF EPOXIDE GROUPS, EXPOSING THE IMPREGNATED MATERIAL TO ACTINIC RADIATION SUCH THAT THE COMPOSITION SOLIDIFIES DUE TO PHOTOPOLYMERIZATION OF THE SAID PHOTOPOLYMERIZABLE COMPOUND WHILE THE EPOXIDE RESIN REMAINS SUBSTANTIALLY IN THE THERMOSETTABLE STATE. |
