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직포 지오텍스타일의 봉합선 및 봉합부 접착에 의한 봉합강도 향상에 관한 연구
연우,이형호,유남재,전한용,Yan, Yu,Lee, Hyeong Ho,Yoo, Nam Jae,Jeon, Han-Yong 한국섬유공학회 2018 한국섬유공학회지 Vol.55 No.6
In this study, a 6-line seaming method was used to connect woven geotextiles for soft ground reinforcement and select adhesives were added to the seaming part of the woven geotextile to improve the seam strength. Different reinforcement effects were observed according to the type of adhesive used. The strength retention of the seam strength was excellent when the cyanoacrylate adhesive was used in place of the epoxy adhesive. Since the reduction factor directly affects the tensile and seam strengths of the woven geotextile, it is essential to reinforce the seam using proper adhesives. The reduction factor and long-term performance of the adhesive agent are thought to contribute to the improvement of seam strength in woven geotextiles, and this was supported by the experimental results.
내진보강용 탄소섬유 복합사 하이브리드 그리드 직물 제조 및 공학적 성능 평가. I. 탄소섬유 복합사 제조 및 최적 직물 설계
연우,차주희,채철수,이형호,전한용,Yan, Yu,Cha, Ju Hee,Chai, Charles,Lee, Hyeong Ho,Jeon, Han Yong 한국섬유공학회 2018 한국섬유공학회지 Vol.55 No.4
In this study, a carbon fiber composite yarn with the desired stiffness and ductility was fabricated for use in hybrid grid fabrics for seismic reinforcement, and the optimum structures of the grid fabrics were evaluated. Carbon fiber composite yarn was prepared by a double-covering process with carbon fiber/aramid fiber/high-strength PET fiber. It was confirmed that the strength of the carbon fiber composite yarn was greatly increased compared to that of carbon fiber, and the elongation increased by about 0.5%. The TPU (thermoplastic polyurethane) extrusion coating method was more suitable for the carbon fiber composite yarn than urethane impregnation for the coating process. Meanwhile, in the evaluation of yarn fineness and grid structure, thick fibers had greater strengths. When comparing the strength and elongation, the bi-directional grid showed no advantages over the unidirectional grid.
Effect of Maleic Anhydride-grafted Polypropylene on Recycled Carbon Fiber Reinforced Polypropylene
SeungJae Ahn(안승재),Yu Yan(연우),Han-Yong Jeon(전한용) 한국고분자학회 2020 폴리머 Vol.44 No.1
플라스틱 기반 폐기물의 문제가 증가되면서 탄소섬유 복합재료(CFRPs)는 폐순환 재료 수명 주기를 달성할 필요가 있다. 본 연구는 폴리프로필렌(PP)을 사용한 재생 탄소섬유 복합재료(rCFRPs)의 잠재성을 연구하는 것을 목표로 한다. PP는 관능기가 없기 때문에 기계적 물성 향상을 위해 말레산 무수물이 그래프트된 폴리프로필렌(MAPP)을 커플링제로 사용하였다. rCFRP는 재생 탄소섬유(rCF) 습식부직포와 매트릭스 필름을 포개어 압축성형으로 제조하였다. 충분한 산소 관능기가 rCF 표면에 존재함을 확인했으며 그 관능기들은 말레산 무수물(MA)과 rCF 표면의 공유결합에 의한 기계적 물성 향상에 기여하였다. rCFRP의 인장특성은 2wt%의 MAPP 첨가만으로도 극적인 향상을 보였지만 5 wt%까지 MAPP의 함량에 대한 효과는 미미하였다. As the problem of plastic based material waste is increasing, carbon fiber reinforced plastics (CFRPs) need to achieve closed life cycle. This study aims to investigate the potential for recycled carbon fiber reinforced plastics (rCFRPs) with polypropylene (PP). To improve mechanical properties of rCFRP, maleic anhydride grafted polypropylene (MAPP) was used as a coupling agent due to absence of functional group in PP. The rCFRPs were prepared by compression molding after stacking of recycled carbon fiber (rCF) wet-laid nonwovens and matrix films. The sufficient oxygen functional groups observed on rCF surface and they contributed to improve mechanical properties by covalent bond between maleic anhydride (MA) group and rCF surface. The tensile properties of the rCFRP with 2 wt% MAPP were dramatically increased compared to that without MAPP. However, the effect of MAPP content until 5 wt% on the tensile properties was slight.