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Cheon, Jinsil,Lee, Minwook,Kim, Minkook Elsevier 2020 COMPOSITE STRUCTURES -BARKING THEN OXFORD- Vol.234 No.-
<P><B>Abstract</B></P> <P>In this study, stiff stab-resistant materials for riot shields were developed by using fiber reinforced polymer composites (FRPs) made of three different types of fibers: carbon, glass and p-aramid. The stab resistance of the FRPs were investigated with respect to the thickness and types of reinforced fibers according to the U.S.A. National Institute of Justice (NIJ) standard. Hybrid composites were then developed to compensate for the weaknesses of each FRP, and the stacking sequences were optimized. The mechanisms of the stab resistance and the blade penetration for each FRP were investigated via static stab compressive tests. Additionally, the failure mode and fracture topography after the stab resistance tests were obtained using a micro-CT scanner.</P>
전자빔에 의해 경화된 유리섬유/Diepoxidized Polycardanol 복합재료의 인장, 동역학 및 마모 특성
천진실,조동환,Cheon, Jinsil,Cho, Donghwan 한국섬유공학회 2016 한국섬유공학회지 Vol.53 No.3
In the present study, the effect of electron beam irradiation on the tensile, dynamic mechanical, and abrasion properties of glass-fiber-reinforced diepoxidized polycardanol (DEPC) composites was explored. Triarylsulfonium hexafluoroantimonate, an antimonate-type photoinitiator (2 wt%) was added to diepoxidized cardanol (DEC) prior to composite curing by electron beam. The glass fabrics pre-impregnated with DEPC were consolidated by direct irradiation of electron beam at 400, 500, and 600 kGy at ambient temperature and pressure. The composite properties strongly depend on the applied electron beam intensity. The result indicates that electron beam curing of glass fiber/DEPC composites at 600 kGy resulted in the highest tensile modulus, tensile strength, dynamic storage modulus, abrasion resistance, and lowest damping among the applied electron beam absorption doses.
Daeyeon Kim,Jinsil Cheon,Jeonghoon Kim,Daekyun Hwang,Ikpyo Hong,Oh Hyeong Kwon,Won Ho Park,Donghwan Cho 한국탄소학회 2017 Carbon Letters Vol.22 No.-
In the present study, biomass-based lignin was extracted from industrial waste black liquor and the extracted lignin was characterized by means of attenuated total reflectance- Fourier transform infrared spectroscopy and 1H-nuclear magnetic resonance spectroscopy. The extracted lignin was carbonized at different temperatures and then activated with steam at 850oC. The extracted lignin in powder state was transformed into a bulky carbonized lignin due to possible fusion between the lignin particles occurring upon carbonization. The carbonized and then pulverized lignin exhibits brittle surfaces, the increased thermal stability, and the carbon assay with increasing the carbonization temperature. The scanning electron microscopic images and the Brunauer-Emmett-Teller result indicate that the steam-activated carbon has the specific surface area of 1718 m2/g, which is markedly greater than the carbonized lignin. This study reveals that biomassbased activated carbon with highly porous structure can be produced from costless black liquor via steam-activation process.