Jae Young Lee and Donghwan Cho†
Department of Polymer Science and Engineering, Kumoh National Institute of Technology, Gumi, Gyeongbuk 39177, Korea
이재영 · 조동환†
금오공과대학교 고분자공학과
Lyocell fabrics were treated with 3-glycidoxypropyltrimethoxy silane (GPS) at different concentrations of 0.5, 1, and 3 wt%. Lyocell/PLA composites were then fabricated by a compression molding process using a film-stacking manner, which was stacking poly(lactic acid) (PLA) films between the lyocell fabrics, and their mechanical and thermal properties were explored. The tensile and flexural properties, heat deflection temperature, and thermo-dimensional stability of PLA were largely increased due to a reinforcing effect by the lyocell fabrics. The properties were further increased by silane treatment done to the lyocell fabrics prior to composite fabrication, showing the highest improvement with 1 wt% GPS. The effect of silane treatment on the improvement of the mechanical and thermal properties was consistent with the effect of silane treatment on the interfacial bonding between the lyocell fiber and the PLA matrix of the composite as well as on the lyocell single fiber tensile properties.
3-Glycidoxypropyltrimethoxy silane(GPS)의 농도를 0.5, 1, 3 wt%로 각각 달리하여 라이오셀 직물을 처리한 다음, 라이오셀 직물과 직물 사이에 poly(lactic acid)(PLA) 필름을 적층하여 압축성형법으로 라이오셀/PLA 복합재료를 제조하고 그들의 기계적, 열적 특성을 조사하였다. PLA의 인장특성, 굴곡특성, 열변형온도, 열치수안정성은 라이오셀 직물의 보강효과에 의해 매우 크게 증가하였다. 이들 특성은 복합재료 성형 전 라이오셀 직물에 행한 실란 처리에 의해 더욱 증가되었으며, GPS 농도가 1 wt%일 때 가장 크게 향상되었다. 라이오셀/PLA 복합재료의 기계적, 열적 특성 향상에 미치는 실란처리의 영향에 대한 결과는 라이오셀 단섬유 인장특성 그리고 복합재료를 구성하는 라이오셀 섬유와 PLA 매트릭스 사이의 계면결합에 미치는 실란처리 영향에 대한 결과와 일치하였다.
Keywords: lyocell, poly(lactic acid), composite, mechanical properties, thermal properties
2018; 42(1): 125-132
Published online Jan 25, 2018
Department of Polymer Science and Engineering, Kumoh National Institute of Technology, Gumi, Gyeongbuk 39177, Korea