The decomposition of glass fiber reinforced plastics (GFRP) with ethylene glycol monoallyl ether (EGMA) and benzyl alcohol (BnOH) by non-catalytic transesterification under high pressure, microwave irradiation was investigated. The decomposition product of GFRP with EGMA (EGMA-P) has a high reactivity for the cross-linking reaction to unsaturated polyester (UP) compared to the product of GFRP with BnOH (Bn-P) because of the presence of many allyl groups derived from EGMA. Therefore, the hardened material (EGMA-HM) with high thermal stability was prepared from EGMA-P, unsaturated polyester, and curing agent. Finally, the recycled GFRP with high bending breaking point was produced from EGMA-P.
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