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유리섬유/비닐에스터 수지 복합재료의 특수환경에 대한 내구성 시험
이승렬,박창호,서상하,김영운,김형열,박영환,최희락,문창권,Lee Seung-yul,Park Chang-Ho,Seo Sang-Ha,Kim Young-Un,Kim Hyeong-Yeol,Park Young-Hwan,Choi Hee-Lack,Moon Chang-Kwon 한국섬유공학회 2005 한국섬유공학회지 Vol.42 No.6
The effect of various environmental conditions on the durability in E-glass fiber/vinylester resin composites has been investigated using tensile test specimen of strand type. Tensile strength decreased with increasing immersion time in all environmental conditions. The extent of decrease was more severe in the case of alkaline condition than deionized water condition regardless of temperature. We found that the decrease in tensile strength during the immersion time in various environment conditions was mainly caused by the degradation of the interface between glass fiber and vinylester resin and damage of glass fiber surface.
이승렬(Lee Seung Ryul),김형열(Yeol Hyeong Kim),박영환(Young Hwan Park),문창권(Chang Kwon Moon) 한국동력기계공학회 2004 한국동력기계공학회 학술대회 논문집 Vol.- No.-
The mechanical properties of glass fiber reinforced vinylester reinforcing bars(rebar) in various environment conditions such as moisture, chloride, alkali and freeze-thaw actions at temperature ranging from room temperature(25℃) to high temperature of up to 80℃ in this paper. From the test results, it was found that tensile strength and interfacial shear strength of GFRP bar decreased with the increasing of temperature and holding time of each environment condition.
술폰산화 폴리에틸렌옥사이드로 표면개질한 생체동맥의 석회화 저항 효과
김형묵,백만종,선경,이승렬,이송암,김광택,이인성,이원규,박기동,김영하,Kim, Hyoung-Mook,Baek, Man-Jong,Sun, Kyung,Lee, Seung-Yeol,Lee, Song-Am,Kim, Kwang-Taik,Lee, In-Sung,Lee, Won-Kyu,Park, Ki-Dong,Kim, Young-Ha 대한흉부심장혈관외과학회 1999 Journal of Chest Surgery (J Chest Surg) Vol.32 No.11
Background: Calcific degeneration is the major cause of clinical failure of glutaraldehyde (GA) crosslinked bioprosthetic tissues implanted in the body and necessitates the reoperation or causes death. Surface modification of biologic tissues using sulfonated polyethyleneoixde (PEO-SO3) has been suggested to significantly enhance blood compatibility, biostability and calcification-resistance by means of the synergistic effect of highly mobile and hydrophilic PEO chains and electrical repulsion of negatively charged sulfonate groups. This study was designed to evaluate the anticalcification effect of surface-modification of biologic arteries by direct coupling of PEO-SO3 after GA fixation and changes of calcification according to the implantation period through the quantitative investigation of the deposited calcium and phosphorous contents of the biologic arterial tissues in the canine circulatory implantation model. Material and Method: Total of 16 fresh canine carotid arteries were harvested from eight adult dogs and divided in to GA group(n =8) and PEO-SO3 group(n=8). Sulfonation of diamino-terminated PEO was performed using propane sultone. Canine carotid arteries were only crosslinked with 0.65% GA solution in GA group and modified by direct coupling 5% PEO-SO3 solution after GA crosslinkage for 2 days and stabilized by NaBH4 solution for 16 hours in PEO-SO3 group. In both groups the resected segment of bilateral carotid arteries were reconstructed. Reconstructed segments of the two groups were analysed the quantities of calcium and phosphorous contents after 3(n=4) and 6(n=4) weeks in vivo. Result: After implantation of 3 seeks, PEO-SO3 group showed significantly less depositions.