| 摘要 |
<p>Fibrous-reinforced composites, such as prepregs and sheet mouldings compounds, are made with a thermosettable unsaturated polyimide resin, a photopolymerisable compound, and a heat-activated curing agent for the resin. Fibers may be impregnated with a liquid mixture of the resin and the photopolymerisable compound, and irradiated to cause the mixture to solidify through photopolymerisation. The product, when desired, e.g., after stacking to form a multilayer laminate or after shaping, is heated to cure the resin. Alternatively, the liquid mixture is irradiated to form a solid film, into which the fibers are pressed, and, when required, the assembly is heated to cure the resin. The resins employed contain at least two maleimide, citraconimide, or itaconimide groups linked through nitrogen atoms thereof to carbon atoms.</p> |
