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Bamboo Test Refference Essay

1261 words - 6 pages

 Introduction
Bamboo, one of the strongest natural structural composite materials, has many distinguishing features. It has been found that its reinforcement unit, hollow, multilayered and spirally-wound bast fiber, plays an extremely important role in its mechanical behavior. In recent years, the development of biocomposites from biodegradable polymers and natural fibers have attracted great interests in the composite science, because they could allow complete degradation in soil or by composting process and do not emit any toxic or noxious components. For the past several years, public attention has gone to natural fibers as a resource due to their fast growth. Bamboo is an abundant ...view middle of the document...

 Experiment
1. The MBF paste was first dispersed into DD water to form a uniform suspension. 10%, 20%, 30% and 40% of MBF were added to study the effect of MBF. MBF water suspension was mixed with the SPC dispersion in water in varying amounts. The mixture was mechanically stirred at room temperature until a uniform suspension was obtained. The dried composite sheets containing MBF were hot-pressed in Carver Hydraulic hot press and the thicknesses were in the range of 0.14 mm. Resin and composite specimens were characterized for their tensile properties, such as Young’s modulus, fracture stress, fracture strain and toughness, using an Instron universal tester (model 5566). Moisture content was measured using a Brabender moisture tester (model 1153). The SPC cross-linking using ITES was characterized by sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS–PAGE). Leica scanning electron microscope (SEM), model 440X was used to characterize the dimensions of the MBF used. The specimens were also characterized for their thermal stability using a thermogravimetric analyzer (TGA). The dynamic mechanical properties of the specimens were characterized using dynamic mechanical analyzer (DMA, model-2980) 2. Natural bamboo bast fiber is so slender that its diameter ranges between 20 µm and 45 µm and its length is 1000- 2000 µm. The axial compressive buckling test was performed to compare the structural stability of the four types of specimens. The testing speed was 2 mm min-1 and the test was performed at room temperature. the bending test, owing to the anisotropy and thick wall of the four types of specimens. 3. Fiber bundles of 125–210 mm in diameter were obtained by a sifter machine with mesh filtrating the commercial bamboo chips. MAPP (maleic anhydride modified PP. (Umex 1001: Sanyo Chemical Industries, Ltd)/PP (Novatec; Japan Polychem Co.) mixed at a ratio of 5/95 in weight) was used as a matrix of BFEC. Tensile tests were conducted using a small-capacity testing machine (ASG-H/Ez Test-500: shimadzu). the molding process, a 150 £ 150 £ 2 mm thick plate of BFEC was obtained. Tensile

specimens of the BFEC were cut off in the form of rectangular strips from the molded plate, seven samples of BFEC were tested on a universal testing machine (AUTOGRAPH: Shimadzu Co.). The fractured surfaces were also checked by the scanning electron microscope (SEM). 4. PLA (LACEA H-100J) and PBS (Enpol G5300) were purchased from Mitsui Chemical, Inc. (Tokyo, Japan) and Ire Chemical Ltd (Wonju, Korea), respectively. Average length and diameter of bamboo fiber (BF) used in this study were approximately 500 and 70 mm, respectively. L-lysine-diisocyanate (LDI) was kindly supplied by Kyowa Hakko Co., Ltd (Tokyo, Japan). Proteinase K and Lipase PS were purchased from Nacalai Tesque, INC. (Kyoto, Japan). All other...

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