A Hot-Melt Thermosetting Phenolic Prepreg and its Composites

Abstract

A novel phenolic resin suitable for hot-melt impregnation process was developed through copolymerization. The curing reactivity, gel properties and viscosity of the resin were tested to evaluate the resin reaction process. A prepreg of this resin and glass fabrics was developed with hot-melt process. The cured phenolic prepreg laminates havebalanced mechanical properties. It can be used to manufacture interior structures for airplanes and high-speed trains or other applications with flame retard requirement.

Time‐temperature‐transformation diagram of modified resol phenolic resin and the thermomechanical performance of resol phenolic resin/glass fabric composite

“…In addition, the volatile solvent could increase such defects as voids and delaminations, which results in the nonuniform distribution of the resin in the prepreg. The above disadvantages associated with the solution impregnation method further exacerbate the instability of the product batch and deteriorate the comprehensive performance of phenolic resin composite . To overcome the limitation of solution impregnation, discussions regarding hot melt preimpregnated method are prevailing in recent years; especially, with such features as economical and eco‐friendly, hot melt preimpregnated method can meet the requirement of the sustainability of high‐performance composite.…”