リサイクル熱硬化性樹脂の衝撃特性に及ぼす粒子径の影響

摘要

Epoxy and unsaturated polyester resins are typical thermosetting resins used as matrix for composites, and generally difficult to recycle. In this study, reprocessed epoxy and unsaturated polyester resins were prepared with ground epoxy or unsaturated polyester resin. We measured the impact fracture energy of reprocessed epoxy and unsaturated polyester resins with different volume fraction of ground epoxy or unsaturated polyester resin. The impact fracture energy lowered with increasing the size and the volume fraction of ground resins. The impact fracture energy of reprocessed resin was described by the sum of the fracture energy of the matrix resin and the mixed ground particles and the energy necessary to strip the ground particles on the fracture surface. The calculated values of the impact fracture energy were almost agreed the experimental values. It was found that in any resin, the impact fracture energy of the matrix resin mainly contributes to the impact fracture energy.%繊維強化プラスチック（FRP）は比強度，比剛性が大きい利点を活かし，構造材料，部品等として，いろいろな分野で広範に用いられている．さらに，成形性や耐水性，軽量性などの利点によりその使用量は増加し，最近では原油高の影響による燃料費の高騰のため，自動車や航空などの輸送分野では，車体や機体のさらなる軽量化が図られ，FRPが益々注目されている．しかし，使用済みとなったFRPは，その優れた特性のため，一般にリサイクルが困難である．