커피찌꺼기의 표면개질이 에폭시 복합재료에 미치는 영향
Effect of Surface Modification of Coffee Grounds on Epoxy Composites
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초록
커피찌꺼기는 환경문제를 유발하며 지속적으로 발생량이 증가되는 대표적인 폐기물 중 하나이다. 이러한 커피찌꺼기를 활용하기 위해 가장 효율적인 방법은 다량은 유기물 및 오일류를 활용하여 에너지용 재료로 활용하는 것이 많이 발표되고 있다. 하지만 유기물 및 오일류를 제거한 셀룰로오스 구조물에 대한 재활용을 확인하고자 본 연구를 수행하였다. 커피찌꺼기에 유기물층을 제거하기 위해 세척시간의 변수에 따라 유기물의 표면변화를 FE-SEM과 FT-IR, XRD로 확인하였다. 커피찌꺼기 세척시간이 증가됨에 따라 입자크기의 변화가 크게 발생되었고, 에폭시 강화 복합재료로 사용하기 위해 강화재로 활용하여 농도에 따른 인장특성을 변화를 조사하였다. 궁극적으로 고분자 결정구조가 높은 조건에서는 커피찌꺼기를 활용한 강화효과가 미미하였고, 커피찌꺼기와 에폭시 간의 계면 접착을 유도하기 위해 최소의 유기물 층은 존재해야 함을 확인하였다. 궁극적으로 1 wt% 이하의 함량으로 커피찌꺼기를 활용한 에폭시 복합재료 제조가 적합하였으며, 이러한 연구는 다양한 커피찌꺼기 재활용 방안으로 활용될 것으로 예상된다.
Abstract
Spent coffee grounds (SCG) are one of the most common waste products contributing to environmental problems, with their volume continuously increasing. The most efficient way to utilize SCG is by leveraging their large amounts of organic matter and oils for energy production. This study investigates the recycling potential of cellulosic structures after the removal of organic matter and oils. Surface changes in the organic matter of SCG were examined as a function of washing time using FE-SEM, FT-IR, and XRD. As washing time increased, significant changes in particle size were observed, and the tensile properties were evaluated at varying concentrations to assess their suitability as a reinforcing material in epoxy composites. The study found that the reinforcement effect of SCG was minimal under conditions of high polymer crystallinity, indicating that a minimal organic layer is necessary to promote interfacial adhesion between SCG and epoxy. Ultimately, it was determined that SCG is best used in epoxy composites at concentrations of 1 wt% or less. This research provides a potential method for recycling various types of coffee grounds.
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