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도파민이 첨가된 에폭시 기지재의 기계적 물성 및 유리섬유 간 계면접착력 향상
신평수,김종현,백영민,박하승,박종만 한국복합재료학회 2019 Composites research Vol.32 No.2
Interfacial adhesion between fiber and resin are related to composites performance, so it is very important to evaluate them accurately. In this study, the interfacial properties of microdroplets under fatigue loading conditions were evaluated. The mechanical properties and interfacial adhesion of epoxy resin with dopamine were studied. Tensile specimens were prepared to evaluate mechanical properties and epoxy microdroplets specimens were used for the evaluation of interfacial adhesion. In addition, in the microdroplet fatigue test, the same diameter of the microdroplet was used and the experiment was performed under the same conditions. As a result, it was confirmed that mechanical and interfacial properties were improved when dopamine was applied to epoxy resin through tensile and microdroplet experiments. It is considered that dopamine improves the degree of curing of the epoxy resin and imparts hydroxyl groups to the epoxy resin to increase the mechanical properties and the interfacial adhesion between the glass fibers. 섬유와 수지 간 계면접착력은 복합재료 성능과 관련되므로 이를 정확하게 평가하는 것은 매우 중요하다. 본 연구에서는, 피로 하중 조건에서의 마이크로드롭렛 실험에 의한 계면접착력 평가를 실시하였다. 도파민이 적용된 에폭시 수지에 대하여 기계적 물성 및 계면접착력을 측정하였다. 기계적 물성을 평가하기 위해 인장 시편을 제작하였고, 계면 접착력 평가를 위하여 유리섬유에 에폭시 마이크로드롭렛을 만든 시편을 사용하였다. 특히 마이크로드롭렛 피로 실험 시 동일한 직경의 마이크로드롭렛을 사용하여 동일한 조건에서 실험하였다. 그 결과 인장 및 마이크로드롭렛 실험을 통해 에폭시 수지에 도파민이 적용될 때 기계 및 계면접착력이 향상됨을 확인하였다. 도파민이 에폭시 수지의 경화정도를 향상시키고 에폭시 수지에 하이드록실 그룹을 부여하여 기계적 물성 및 유리섬유 간 계면 접착력을 증가시켰을 것으로 사려된다.
질소환경에서 보관된 전기전도성 페인트의 접착 및 수명연장 특성
신평수,김종현,백영민,박하승,박종만 한국접착및계면학회 2019 접착 및 계면 Vol.20 No.1
The change of three different reagents for electrical conductive paint using aircraft coating with elapsing time of exposure to different condition was investigated. Three different reagents were poured into the vial bottles, stored in air condition and room temperature and observed with elapsing days. In addition, adhesion property of paint was tried using cross cut tape test after storage of N2 atmosphere. The weight of each different reagent was measured along with elapsing time. To confirm the change of chemical component with exposure of air atmosphere, FT-IR was performed. The weight of part A and Part B decreased slightly whereas the weight of part C decreased rapidly and the precipitation was remained. The part B was cured after exposure of N2 atmosphere and the 2250 cm-1 from FT-IR peak decreased slowly at the same time. It was considered that the water contained in air accelerated the reaction of -NCO functional groups and it caused the curing whereas N2 atmosphere not contained water and it resulted in the retardancy of curing.
신평수,Jong-Hyun Kim,Ha-Seung Park,백영민,이상일,K. Lawrence DeVries,박종만 한국섬유공학회 2020 Fibers and polymers Vol.21 No.2
Composites has been an area of active research for the past several decades due to their lightweight and good mechanical properties. However, the aging of fiber reinforced composites is a major issue due to exposure of thermal, waterand ultraviolet conditions. Continuous damage could bring about mechanical property degradation and damage at the interface. This is a comprehensive review on of aging effects in water, heat, ultraviolet etc. on composites and the changes in chemical, mechanical and interfacial properties, evaluated by nondestructive and micro-mechanic evaluations. It focuses particularly on composites with superior chemical, mechanical and interfacial properties, as well as good high resistance to aging, as these are considered to be important Structural materials. Types of composites and aging effects of aged composite by exposure to water, heat and ultraviolet radiation are explored. Based on these nondestructive and micro-mechanical evaluations methods are suggested to reduce the diverse ageing effects.