| 摘要 |
<p>Fibrous-reinforced composites, such as prepregs and sheet moulding compounds, are made with a thermosettab1e cyanato compound. a photopolymerisable compound, and. if required, a heat-activated accelerator for heat-curing the cyanato compound. Fibers may be impregnated with a liquid mixture of the cyanato compound 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 cyanato compound. Alternatively, the liquid mixture is irradiated to form a solid film into which the fibers are pressed, and then, when required, the assembly is heated to cure the cyanato compound. The cyanato compounds employed are of formula where R is an aliphatic, cycloaliphatic, or. preferably, an aromatic organic, group of not more than 18 carbon atoms, a is zero, or, if R is an aromatic group, may alternatively be an integer of 1 to 3, and b is an integer of 1 to 6 such. that (a + b) is at least 2.</p> |
