| 摘要 |
<p>"REINFORCED COMPOSITES" A method for the preparation of prepregs comprisesi) impregnating a fibrous reinforcing material with a liquid composition containing both a thermosettable phenol-aldehyde resin and at least one photopolymerisable component and ii) exposing the impregnated material to actinic radiation such that the said composition solidifies due to photopolymerisation of the said photopolymerisable component while the phenol-aldehyde resin remains substantially in the thermosettable state. The prepreg,optionally after shaping and/or stacking, is heated to cure the phenol-aldehyde resin.</p> |
