CAJ | 학술논문

采用浓HNO3/浓H2SO4混合酸在60℃超声环境下对T300碳纤维进行表面氧化处理，并以其为增强体制备碳纤维/环氧树脂复合材料。利用 X 射线光电子能谱仪、拉曼光谱仪、扫描电镜、原子力显微镜对表面氧化前后的碳纤维形态与表面化学性质进行表征，研究氧化时间对纤维的表面形貌与表面性质以及碳纤维/环氧树脂基复合材料力学性能的影响。结果表明，氧化初期，碳纤维表面生成S—、N—含氧基团，以及—OH和—C=O；后期形成—COOH，氧化时间为15 min时，—COOH的浓度达到最大值。碳纤维/环氧树脂复合材料的强度随混合酸氧化时间延长而不断增强，氧化15 min时强度达到峰值，相比于未氧化处理的样品，复合材料层剪切强度从16.3 MPa提高到38.8 MPa，抗弯强度从148.3 MPa提高到379.7 MPa。
채용농HNO3/농H2SO4혼합산재60℃초성배경하대T300탄섬유진행표면양화처리，병이기위증강체제비탄섬유/배양수지복합재료。이용 X 사선광전자능보의、랍만광보의、소묘전경、원자력현미경대표면양화전후적탄섬유형태여표면화학성질진행표정，연구양화시간대섬유적표면형모여표면성질이급탄섬유/배양수지기복합재료역학성능적영향。결과표명，양화초기，탄섬유표면생성S—、N—함양기단，이급—OH화—C=O；후기형성—COOH，양화시간위15 min시，—COOH적농도체도최대치。탄섬유/배양수지복합재료적강도수혼합산양화시간연장이불단증강，양화15 min시강도체도봉치，상비우미양화처리적양품，복합재료층전절강도종16.3 MPa제고도38.8 MPa，항만강도종148.3 MPa제고도379.7 MPa。
T300 carbon fiber was oxidized in H2SO4/HNO3 liquid at 60℃ under ultrasound environment. The oxidized T300 fiber was used to prepare the carbon fiber reinforced epoxy resin composite. The morphology, surface chemistry qualities of carbon fiber and mechanical properties of the composite were characterized by means of X-ray photoelectron spectroscopy, Raman spectroscopy, scanning electron microscopy, atomic force microscopy. The results show that, oxygen-containing S— and N— group,—OH, and—C=O generate during the early stage of oxidation,—COOH generates during the late stage of oxidation. The concentration of—COOH reaches the maximum value after 15 min oxidation. The strength of composite increases with increasing oxidation time, and reaches the peak value at 15min. Compared with non-oxidation sample, the interlaminar shear strength (ILSS) of oxidation treated composite increases from 16.3 MPa to 38.8 MPa and the bending strength of the composite increases from 148.3 MPa 379.7 MPa.