ScholarWorks@경상국립대학교

초록

Thermoset industrial wastes, such as waste carbon fiber prepreg (wP) and waste polyurethane foam (wPUF), are difficult to reuse, potentially creating environmental burdens. This study proposes an upcycling strategy that converts these wastes into laminated composite plates for stab-resistant applications. The wP retains heat/ pressure-bondability, while milled wPUF (mPUF) is readily obtained by cutting discarded foam. Using the formability of wP, three laminate architectures were fabricated: wP-only (wP), epoxy-bonded (wP/E), and epoxy with dispersed mPUF (wP/mPUF-E). Tensile, flexural, shear, and Izod impact properties were measured as a function of ply count, and blade drop and quasi-static knife penetration tests were performed to assess the effects of interlayer design on stab resistance. Unstable wP surfaces led to weak, nonuniform interfaces, but the mPUFreinforced epoxy interlayer filled surface irregularities, improved mechanical interlocking, and increased interlaminar toughness via a polyurethane-rich phase. As a result, both mechanical performance and stab resistance improved, showing a practical way to upcycle thermoset waste with minimal preprocessing.

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