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오존처리된 탄소섬유가 탄소섬유 강화 복합재료의 G2c에 미치는 영향
박수진 ( Park Su Jin ),오진석 ( O Jin Seog ),서동학 ( Seo Dong Hag ) 한국공업화학회 2003 공업화학 Vol.14 No.5
본 실험에서는 오존처리된 탄소섬유가 복합재료의 기계적 계면 물성에 미치는 영향에 대하여 고찰하였다. 탄소섬유의 표면성질은 산염기도, FT-IR, XPS, 그리고 접촉각 측정을 통하여 알아보았으며, 복합재료의 기계적 계면특성은 층간파괴인성특성(critical strain energy release rate mode Ⅱ; G_(Ⅱc))을 통하여 고찰하였다. 실험결과, 탄소섬유를 오존처리함에 따라 탄소섬유 표면의 산도와 O_(Ⅰs)/C_(Ⅰs)비율이 증가하였는데, 이는 탄소섬유 표면의 산소관능기 발달에 기인하며, 표면자유에너지의 증가는 극성요소의 증가에 기인하는 것으로 판단된다. 기계적 계면성질인 G_(Ⅱc) 값은 탄소섬유의 오존처리로 향상되어졌는데, 이는 탄소섬유 표면 젖음성 향상에 따른 최종 복합재료의 섬유와 매트릭스 사이의 계면결합력이 증가하였기 때문이라 판단된다. In this work, the influence of ozone treatment on mechanical interfacial properties of carbon fibers-reinforced composites was investigated. The surface characteristics of carbon fibers by ozone treatment were studied in acid-base values, XPS, FT-IF, and contact angle measurements. Mechanical interfacial properties of the composites were investigated in terms of critical strain energy release rate mode II(G_(IIC)). The O_(Is)/C_(Is) ratio of the carbon fiber surfaces treated by ozone increased compared to that of untreated ones, possibly due to development of oxygen-containing functional groups. Consequently, the ozone treatment led to an increase of specific components of surface free energy of carbon fibers, resulting in improving the (G_(IIC)) of the composites. This result was probably due to the increase of interfacial adhesion between the fibers and the matrix, which could be attributed to the good wettability of carbon fiber surfaces.
분체공학,유동층,고분자,재료(무기, 유기) : 양극산화된 탄소섬유/에폭시 복합재료의 크랙저항 특성
박수진 ( Park Su Jin ),오진석 ( O Jin Seog ),서동학 ( Seo Dong Hag ) 한국화학공학회 2004 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.42 No.1
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(G_(ⅠC)) and mode Ⅱ(G_(ⅡC)). The O_(IS)/C_(IS) 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 G_(ⅠC) and G_(ⅡC) 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.
분체공학,유동층,고분자,재료(무기,유기) : 표면처리된 탄화규소의 첨가가 탄소섬유 강화 복합재료의 열안정성 및 기계적 특성에 미치는 영향
박수진 ( Park Su Jin ),오진석 ( O Jin Seog ),서동학 ( Seo Dong Hag ) 한국화학공학회 2003 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.41 No.5
In this work, the effect of chemically wet and dry treatments of SiC was investigated in mechanical interfacial properties of carbon fibers-reinforced composites. The surface properties of Sic were determined by acid/base values, contact angles, and FT-IR analyses. The thermal stabilities of the carbon fibers-reinforced composites were investigated by thermo-gravimetric analysis (TGA). Also, the mechanical interfacial properties of the composites were studied in interlaminar shear strength (ILSS) and critical strain energy release rate mode Ⅱ(G_(ⅡC)) measurements. As a result, the acidically treated SiC (A-Sic) and ozone treated (0-Sic) had higher acid value than that of untreated Sic (V-Sic) or basically treated Sic (B-Sic). According to the contact angle measurements, it was observed that acidic solution and ozone treatments led to an increase of surface free energy of the SIC surfaces, mainly due to the increase of the specific (polar) component. The mechanical interfacial properties of the composites, including ILSS and G_(ⅡC) had been improved in the specimens treated by acidic solutions and ozone gas. These results were explained that good wetting played an iniportant role in improving the degree of adhesion at interfaces between SiC and epoxy resin matrix in a composite system