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Received September 22, 2003
Accepted January 3, 2004
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양극산화된 탄소섬유/에폭시 복합재료의 크랙저항 특성
Crack Resistance Properties of Anodized Carbon Fibers/Epoxy Matrix Composites
한국화학연구원 화학소재연구부, 305-600 대전시 유성구 장동 100 1한양대학교 화학공학과, 133-791 서울시 성동구 행당동 17
Advanced Materials Div., Korea Research Institute of Chemical Technology, 100, Jang-dong, Yuseong-gu, Daejeon 305-600, Korea 1Department of Chemical Engineering, Hanyang University, 17, Haengdang-dong, Seongdong-gu, Seoul 133-791, Korea
psjin@krict.re.kr
Korean Chemical Engineering Research, February 2004, 42(1), 102-106(5), NONE Epub 22 April 2004
Abstract
본 실험에서는, 양극산화 처리된 탄소섬유의 표면 변화가 탄소섬유 강화 에폭시 복합재료의 크랙저항 특성에 미치는 영향에 대하여 고찰하였다. 탄소섬유의 표면처리 전후 표면특성 변화는 산-염기도, FT-IR, XPS 그리고 접촉각 측정을 통하여 알아보았고, 복합재료의 크랙저항 특성은 임계에너지 방출 속도 I(critical energy release rate, GIC)와 임계에너지 방출 속도 II(critical energy release rate mode II, GIIC)의 두 가지 방법을 통하여 고찰하였다. 실험결과, 탄소섬유 표면의 표면 산도와 O1S/C1S 비율이 증가하였는데, 이는 탄소섬유의 산성관능기와 표면자유에너지의 극성요소 증가에 기인하는 것으로 판단된다. 복합재료의 GIC그리고 GIIC같은 기계적 계면성질은 탄소섬유의 양극산화로 향상되어졌는데, 이는 산성관능기들의 증가에 따른 탄소섬유와 매트릭스와의 계면 결합력의 증가에 기인하는 것으로 판단된다.
Anodic oxidation on the surfaces of carbon fibers was carried out to enhance the mechanical interfacial properties of carbon fibers-reinforced epoxy matrix composites. And the surface characteristics of untreated and treated carbon fibers were studied by FT-IR, XPS, and contact angle measurements after modifications. Crack resistance of the composites was investigated using by two types of testing method, namely critical energy release rate mode I(GIC) and mode II(GIIC). The O1S /C1S ratio of the carbon fibers was increased after anodic treatment, due to the introductions of the oxygen-containing functional groups, or the specific components of surface free energy of the carbon fibers. It was found that the mechanical properties at interfaces, including GIC and GIIC of the composites had been improved by the oxidation, which could probably be attributed to the increase of the degree of adhesion at interfaces between fibers and resin matrix in the composite system.
Keywords
References
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Donnet JB, Bansal RC, "Carbon Fibers," 2th ed., Marcel Dekker, New York (1990)
Fitzer E, "Carbon Fibers and Their Composites," Springer-Verlag, New York (1985)
Bauer RS, "Epoxy Resin Chemistry," ACS Advances in Chemistry Series No. 114, American Chemical Society, Washington DC (1979)
Park SJ, "Interfacial Forces and Fields: Theory and Applications," ed. by J.P. Hsu, chap. 9, Marcel Dekker, New York (1999)
Park SJ, Donnet JB, J. Colloid Interface Sci., 206(1), 29 (1998)
Breiner JM, Mark JE, Beaucage G, J. Polym. Sci. B: Polym. Phys., 37(13), 1421 (1999)
Charrier JM, "Polymeric Materials and Processing," Hanser, New York (1990)
Boehm HP, Adv. Catal., 16, 179 (1966)
Lee H, Nevile K, "Handbook of Epoxy Resins," McGraw-Hill, New York (1967)
Park SJ, Lee JR, J. Mater. Sci., 33(3), 647 (1998)
Park SJ, Jang YS, J. Colloid Interface Sci., 237(1), 91 (2001)
VanOss CJ, "Interface Forces in Aqueous Media," Marcel Dekker, New York (1994)
Gardner SDC, Singamsetty SK, Booth GL, He GR, Pittman CU, Carbon, 33, 587 (1995)
Shannon MDG, Bubsey JLJ, Raymond T, Int. J. Fracture, 16, 137 (1980)
Griffith AA, Phil. Trans. R. Soc. London A, 221, 163 (1920)
Russell AJ, Street KN, "Factors Affecting the Interlaminar Facture Energy of Graphite/Epoxy Laminates," Proceedings of the Fourth International Conference on Composites Materials (ICCM-IV), Tokyo, Japan (1982)
Compston PB, Jar PY, Burchill PJ, Takahasi K, Compos. Sci. Technol., 61, 321 (2001)
Dilsiz N, Ebert E, Weisweiler W, Akovali G, J. Colloid Interface Sci., 170(1), 241 (1995)
