그래핀산화물 액정섬유의 기계적 강도향상을 위한 나노셀룰로오스 기반 복합화 연구

다국어 초록 (Multilingual Abstract)

Graphene Oxide (GO) has been announced as a highly anticipated material because solution process is applicable, utilizing its high solubility in various solvents, which is important for industrial application. Taking advantage of soluble process, GO can be processed as a various form such as a film, fiber, membrane, composite and etc. Among them, in a couple of years, GO liquid crystalline (LC) fiber has been received great attention due to high expectations in terms of multifunctional performances. Compared with other materials such as Carbon Nanotube fiber (CNTF) and Carbon Fiber (CF), unfortunately, the mechanical property of GO LC fiber is relatively low. This is mainly because many voids were created when they are assembled into the fiber form. In other words, the nature of high aspect ratio of GO sheets as well as various oxide groups in GO sheets inevitably induces voids in GO fiber. Accordingly, there have been many efforts to fill these voids with other materials so as to increase the mechanical property of GO fiber. In this study, since functional groups of NFC are capable of hydrogen bonding with GO, we used Nano Fibrillated Cellulose (NFC) as a filler for GO/NFC composite fiber. It is found that LC phase in aqueous media for NFC and GO shows both nematic phase and no phase separation, indicating good miscibility between two materials. After that, we make a composite fiber enhanced by making interfacial bonding between two materials using Ethylenediamine (EDA). The EDA treated GO/NFC composite fiber showed enhanced mechanical property about 13.6 times higher than that of pristine GO fiber.

목차 (Table of Contents)

• List of Figures ⅰ
• Abstract ⅳ
• 1. 서 론 1
• 1.1 그래핀 산화물과 액정섬유 9
• 1.2 그래핀 산화물 기반 구조체의 강도 향상 전략 18
• 2. 실 험 21
• 2.1 그래핀 산화물 합성 21
• 2.2 나노 셀룰로오스 기반 그래핀 산화물 섬유 제조 23
• 2.3 무수 에틸렌디아민을 이용한 후처리 공정 25
• 2.4 특성 분석 25
• 3. 결과 및 고찰 31
• 3.1 나노셀룰로오스 기반 그래핀 산화물 복합 섬유의 강도향상 31
• 3.2 후처리 공정을 통한 복합 섬유의 강도향상 38
• 4. 결 론 44
• 참 고 문 헌 46