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RISS 인기검색어
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- 저자 : Ruihua Hu (검색결과 4 건)
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Ruihua Hu,Jun Hee Song,Jun Yong Choi,Phan Quoc Thai,Jae Kyoo Lim 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.3
A fabrication method of a kind of completely biodegradable PLA composites reinforced by short hemp fiber is developed in this paper. The fibers were treated in 6% NaOH aqueous solution and untreated respectively. In these two cases, the composites with 30%, 40% and 50% fiber volume fraction were prepared. The tensile strength, tensile modulus and flexural strength were tested. The results showed that the mechanical properties of this composite with 40% alkali treated fiber volume fraction have the highest values. They are 54.6㎫, 8.5㎬ and 112.7 ㎫ respectively. These values are competitive to those of glass fiber reinforced polypropylene. The density of this composite is 1.23g/㎝3, which is much lower than glass fiber reinforced composites with similar fiber volume fraction. The specific strength was also calculated. Fracture surfaces of the composites were observed by SEM. The results showed that there is still a potential enhancement in the properties by optimizing the fabrication condition.
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Mechanical properties of coconut filter fiber
Suardana Ngakan Putu Gede,Ruihua Hu,Yoon Ho-Chel,Chul-In Kim,Yingjun Piao,Ri Xu,Jae Kyoo Lim 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
In this study, mechanical properties of single coconut filter (CF) and coconut husk (CH) fiber were compared under the same chemical treatment conditions. The fibers were subjected to various surface treatments as follow: CF and CH fibers were treated using 6%w/v NaOH solution at 95℃ for 3 hours, respectively, and then they were washed with water to remove NaOH solution sticking to the fiber surface and dried in oven for 24 hours at 70℃. After that they were soaked in 0.5%, 1%,3% acrylic acid for 0.5, 1 and 3 hours and then washed with distilled water and dried in oven at 70℃ for 72 hours. The tensile test is conducted according to ASTM standard (C1557-03). Tensile strength, Young's modulus (E) and strain at break (ε<SUB>b</SUB>) were evaluated. Mechanical properties of CF fiber are more than twice of those of CH fiber except the strain at break (ε<SUB>b</SUB>) is lower than that of CH. NaOH treated fibers (CF and CH) have higher tensile strength, E and ε<SUB>b</SUB> than those of untreated fibers. Based on the immersion time, the maximum tensile strength and E of CF occur at 0.5h immersion for all acrylic acid concentration. They show a decrease tendency when the immersion time increased. While the maximum tensile strength and E of CH occur at 3h immersion for all acrylic acid concentration and the lowest tensile strength and E at 1h acrylic acid immersion but higher than untreated. The maximum tensile strength and E of both CF and CH occur at 0.5% acrylic acid for all immersion time and show a decrease tendency when the acrylic acid concentration increased. Surface morphologies of the fiber were observed using SEM method and FTIR for characterizing chemically modified fiber.
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The Fracture Property of Biodegradated Natural Fiber Reinforced Composites
Renliang Wang,Jun Hee Song,Ruihua Hu,Ho Chel Yoon,Ngakan Putu Gede Suardana,Yon Jig Kim,Jae-kyoo Lim 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.3
Biodegradable natural composite is enormously applied in industrial production. The present work is concerned with effect of chemical treatment on the fracture study of natural fiber reinforced PLA. The fibers were from hemp and rice straw contrastively. The elastic modulus and tensile strength of PLA were2300 ㎫ and 32 ㎫ respectively. The chemical treated fibers and non-treated fibers were used as reinforcement to improve the mechanical properties. Chopped fibers, the component of unidirectional fiber composites, were made by hand and deposited together with PLA films layer by layer in the compression mold. The properties of tensile strength and elastic modulus performed stable in 35 wt% natural fiber composites. The rice straw fiber composites performed good stabilities especially in 50 wt% ones. The SEM showed a typical matrix failure in the morphology observation. Both hemp fiber and rice straw fiber presented good properties in their own ways.
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Mechanical properties of biodegradable coconut fibre reinforced polylactic acid composite
Kim Yon Jig(김연직),Phan Quoc Thai(판꾹타이),Renliang Wang(왕렌리앙),Jun Yong Choi(최준용),Ruihua Hu(후루이화),Jae Kyoo Lim(임재규) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
In the recent years, the use of natural fiber as reinforcements in polymer composites for replacing synthetic fiber is rapidly increased. Coconut is growing in some tropical countries such as Vietnam, Thailand, India... especially, it is very cheap and infinite resource. Polylactic acid (PLA) is a biodegradable thermoplastic polymer, which was used extensively in recent years because the biodegradable composites are friendly with environment. This study is concerned with the mechanical properties of coconut fiber (coir) reinforced PLA composite. The coconut fiber reinforced PLA composite was manufactured by heating compression mold with different contents of coconut fiber. The tensile test and bending test will be carried out to verify the mechanical properties of composite and the effect of coconut contents to them.
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