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전기방사를 이용한 β형 결정구조의 PVDF 나노섬유 제조에 미치는 금속산화물의 영향
오상연,김의화 한국섬유공학회 2021 한국섬유공학회지 Vol.58 No.2
PVDF is used in various fields owing to its excellent mechanical and hydrophobicproperties and its chemical resistance to corrosive chemicals such as acids, bases, andhalides. A PVDF with a β-type crystal structure can exhibit both piezoelectric and ferroelectriccharacteristics. Thus, it can be used in a variety of electrical and electronic devices. Inthis study, we employed electrospinning using PVDF and metal oxides to manufacture β-type PVDF nanofibers. We also analyzed the crystalline structure of PVDF nanofibers withmetal oxides. During the electrospinning, the crystalline structure of PVDF partially transformedfrom type α to type β. We confirmed that the transition value of PVDF crystallinestructure from type α to type β scaled with the amount of BaO3Ti during the manufactureof PVDF nanofibers with BaO3Ti.
어피 콜라겐을 이용한 전기방사 용액 및 나노섬유 제조방법
오상연,정구,김의화 한국섬유공학회 2020 한국섬유공학회지 Vol.57 No.3
Collagen is a natural, biocompatible, and biodegradable material with low immunogenicity, which is useful for tissue and organ formation and in multiple cellular functions. Moreover, Type I collagen is known to be a suitable material for medical applications. In this study, acid-soluble Type I collagen isolated from fish skin was used to make nanofibers through electrospinning using a high concentration of collagen solutions prepared by dissolving the collagen to 18 wt% in 20 wt% acetic acid at 20 °C. The collagen and collagen nanofiber were Type I collagen subjected to sodium dodecyl sulfate-polyacrylamide gel electrophoresis analysis. The nonaqueous collagen nanofiber was heat-treated, which yielded a chemical crosslinking agent, such as polyacrylic acid, besides collagen.
β형 결정구조를 갖는 PVDF 나노섬유가 필터의 여과 성능에 미치는 영향
오상연,배꽃하얀,이상훈,김의화 한국섬유공학회 2022 한국섬유공학회지 Vol.59 No.4
Currently, the most important PVDF polymorph is the β-phase, which has a netcrystalline dipole moment oriented precisely normal to the molecular chain. This dipolemoment is responsible for the enhancement in piezoelectric and ferroelectric activities. Nanofibers prepared by electrospinning are a desirable material for air filtration applicationsowing to their high porosity, micro–nano channel interconnects, and high surfacearea-to-volume ratio. Electrospinning nanofibers have a high surface-area-to-volume ratio,an adjustable porous structure, and a facile preparation process, making them a suitablecandidate for filtration materials. Previous studies have reported structural variation in electrospunPVDF nanofibers in the presence of BaO3Ti via the formation of β-type incrementcrystallites. In this study, two nanofiber samples prepared by the electrospinning of PVDFand PVDF/BaO3Ti solutions were used to investigate the air filter efficiency and pressuredrop and understand the effect of the crystal structure change of PVDF nanofibers on thefiltration performance. For nanofibers prepared by electrospinning a solution containing amixture of BaO3Ti and PVDF, the β-type crystal structure transition and dielectric constantimproved. The results indicated that the realization of high-performance filter materialswith a low pressure drop at the same high filter efficiency is possible.