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Biodegradable Composites Reinforced With Rice Husk and Rice Straw
Renliang Wang(왕렌리앙),Jun Yong Choi(최준용),Phan Quoc Thai(판꾹타이),Sang Yong Lee(이상용),Jae-Kyoo Lim(임재규) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
In this study, rice husk and straw particles were manufactured as biodegradable composites using compression mold method. Poly-lactic Acid (PLA) a biodegradable polymer matrix is used. The raw material, rice husk and rice straw, was available and gained on the agriculture field. Chemical treatment methods were carried out on the fibers which vary the proportion of crystallinity and improve the fiber matrix adhesion. Further more, this article gives a survey about physical and mechanical properties in order to accomplish a comparison between rice husk and rice straw. The preparation and properties of the fibers are discussed briefly as well as their compatibility with existing processing technology. The effectiveness of this method is strongly influenced by the treatment conditions used. This kind of bio-composites will be used as flexural materials in construction because of the bearing capacity of pressure.
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.
Fan Wang,Renliang Yu,Shengnan Wen,Jie Yin,Yugen Shi,Hesheng Hu,Suhua Yan 대한약학회 2021 Archives of Pharmacal Research Vol.44 No.5
Myocardial infarction (MI) is one of the leadingcauses of high mortality worldwide. Long non-codingRNA myocardial infarction associated transcript (MIAT)and mitochondrial coupling factor 6 (CF6) aggravate MI. This study aimed to elucidate whether miR-203 interactedwith MIAT and CF6 in MI. Results revealed that MIAT andCF6 expressions were upregulated and that miR-203 wasdownregulated in mouse myocardial tissues after MI, as wellas in hypoxic mouse cardiomyocytes. The overexpressionof MIAT in mouse cardiomyocytes raised CF6 expression,whereas the knockdown of MIAT had the opposite eff ect. Mechanistically, the luciferase reporter and RNA pull-downassays corroborated the binding between miR-203 and CF63′UTR and between miR-203 and MIAT. The simultaneousoverexpression of miR-203 and MIAT restored the reductionof CF6 caused by miR-203 overexpression alone, andthe overexpression of miR-203 diminished the percentage ofinfarct area and the apoptosis of cardiomyocytes in vivo. Our fi ndings corroborate that overexpressing miR-203 alleviatesMI via interacting with MIAT and CF6.
Weiwei Li,Ming Feng,Xiaojing Liu,Momo Huang,Renliang Ma 한국섬유공학회 2019 Fibers and polymers Vol.20 No.2
The properties of ultra-high molecular weight polyethylene (UHMWPE) fibers reinforced epoxy resin composites were studied and the effects of the fiber surface treatment were investigated. The results showed that the surface treatment increased the roughness, O-containing groups (especially -OH groups), crystallinity and improved the wettability ofUHMWPE fibers. The impact strength of the treated UHMWPE fibers/epoxy composites reached the maximum of 92.6 kJ/m2, which was higher than that of pure epoxy and as-received fiber composites. The tensile strength of both as-received and treated fiber composites showed lower than the pure epoxy. However, the tensile modulus was observably increased. The bending strength and modulus of the treated UHMWPE fibers/epoxy composites were 26.2 % and 26.0 %, higher than those of pure epoxy, respectively. The friction coefficients of the two types of composites were both increased. The dynamic mechanical analysis (DMA) results showed that Tg shifted toward higher temperatures and the reduction of tan δ peak of the treated UHMWPE fibers/epoxy composites indicated the adhesion of treated fiber with resin matrix was better than that of as-received fibers, which was in accord with the scanning electron microscope (SEM) analysis. The adding of the treated UHMWPE fibers to the epoxy matrix offered a stabilizing effect against the decomposition.
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.
단일 겹침 접착제 접합된 자연섬유강화 복합재료의 파괴강도 특성
윤호철(H.C. Yoon),송준희(J.H. Song),최준용(J.Y. Choi),Wang Renliang,임재규(J.K. Lim) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
This paper is concerned with a fracture strength study of composite adhesive lap joints. The tests were carried out on specimen joints manufactured hybrid stacked joints such as the original thermoset(polyester) composite, polyester and bamboo natural fiber layer and polyester and steel mesh. The main objective of the work was to test the fracture strength using hybrid fiber composites with a polyester and bamboo natural fiber layer adjacent to the material thickness and hybrid stacked joints. The results are presented using tensile-shear strength graph and finite element analysis. The failure mechanisms are discussed in order to explain the lower tensile-shear strength in hybrid stacked joints than in the original polyester composite joints.