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Suardana Ngakan Putu Gede,Yingjun Piao,Ri Xu,Jae Kyoo Lim(임재규) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11
In this study, mechanical properties of coir/PLA composites were studied under different water immersion time. Coir/PLA composite were prepared using coir fiber treated with NaOH and NaOH followed by soaking in acrylic acid (AA) 0.5% solution with varying immersion time. Fraction volume of the fibers in the PLA composites was fixed at 40%. Water absorption, tensile and flexural properties of these composite were analyzed. The tensile and flexural test are conducted according to ASTM standard D3039 and ASTM D790, respectively. The water uptake process for all specimens sharply increased and approach saturation after 169h. Th e composite with NaOH treated of fiber was the highest to absorb the water. Overall, composites with NaOH followed by AA as a chemical treatment of coir fiber have greater tensile and bending strength than those of untreated and NaOH treated fiber. Based on the immersion time for coir in the AA solution, the maximum tensile and bending strength of composites occur at 0.5h for all water immersion time of composites. The flexural properties of PLA/coir composites shows a decrease tendency when 6h water immersion. Tensile fracture surface morphologies of the composites were observed using SEM method.
대마/유리섬유 강화 복합재료의 제조 및 기계적 특성에 관한 연구
박영준(Yingjun Piao),수아다나(Suardana Ngakan Putu Gede),허일(Ri Xu),이중희(Joong Hee Lee),임재규(Jae Kyoo Lim) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11
In this study, Hemp/Glass fiber hybrid composites were fabricated using hot compression mold method. The mechanical properties of the composites with three different fiber weight fractions were measured in order to investigate the effects of different composition and hemp fiber surface treatment by NaOH on the properties of the composite. Among tested samples, 50w%fiber composites show the highest of mechanical properties. The surface treated fiber composites exhibit higher mechanical properties comparing to the untreated fiber composites. The fracture surface of the composite was also observed by using SEM to understand the interface interaction between fibers and matrix.