本文選題：炭纖維 + 微波誘導氧化��； 參考：《湖南大學》2015年碩士論文

【摘要】：炭纖維是具有優(yōu)異性能的工程材料,常作為各種復合材料的增強體,炭纖維增強復合材料由于良好的機械性能是先進復合材料應用的首選。炭纖維與基體的界面粘結(jié)是控制復合材料整體性能的關(guān)鍵,但是由于炭纖維表面惰性等因素的影響,其與復合材料界面的粘結(jié)較弱。因此,改性炭纖維表面的研究是必需的。本文研究了炭纖維的表面改性、表征以及微滴包埋拉出法測界面剪切強度。采用一種新的方法—微波輻射雙氧水氧化法,對炭纖維進行表面改性,通過使用場發(fā)射掃描電子顯微鏡(FE-SEM)、X射線光電子能譜儀(XPS)、拉曼光譜儀(Raman)和激光顯微儀等表征手段分析炭纖維表面物理化學性質(zhì);并用微滴包埋拉出法測試復合材料的界面剪切強度,并總結(jié)分析了影響界面剪切強度的一些因素。借助FE-SEM、XPS、Raman和激光顯微儀等手段探索各種工藝參數(shù)(微波功率、處理時間、雙氧水濃度等)對炭纖維表面性質(zhì)的影響。通過觀察分析掃描電鏡圖像發(fā)現(xiàn),纖維表面形貌隨著處理條件的改變出現(xiàn)不同的變化,改性后纖維表面出現(xiàn)凹槽和孔洞,還出現(xiàn)一些納米尺寸的突起和白斑等特殊結(jié)構(gòu);通過XPS分析表明,處理后纖維表面含氧量和含氮量都在增加,處理條件的改變和炭纖維種類的不同增加的含量也不同,實驗室自制的一種瀝青基炭纖維改性后氧含量增加最多,達到16.29 mol%,主要是C-O、C=O等含氧官能團的增加。Raman光譜發(fā)現(xiàn)R值(D峰和G峰的面積比)增加,表明微波誘導氧化處理增大了炭纖維表面結(jié)構(gòu)的無序化。激光顯微儀測定纖維表面的粗糙度,展示了粗糙度值的增加。同時本文研究了五種類型的炭纖維,其表面形貌和表面元素發(fā)生了變化,表明這種方法潛在的廣泛適用性。用微滴包埋拉出法測試炭纖維與環(huán)氧樹脂的界面剪切強度(IFSS),來評價炭纖維與環(huán)氧樹脂基體的粘結(jié)情況。從負載-位移曲線讀取樹脂小球從炭纖維上脫落時的脫粘力值,并利用掃描電子顯微鏡觀察了脫粘樹脂小球和炭纖維的狀態(tài),然后定量的計算出兩種樣品的IFSS平均值以及其標準方差、離散系數(shù),并討論了IFSS同樹脂小球的長度與直徑、纖維直徑的關(guān)系。研究發(fā)現(xiàn):所測量的界面剪切強度值與環(huán)氧樹脂小球的長徑比近乎成正比,與纖維直徑成反比,與環(huán)氧樹脂小球的長度和纖維直徑的比值反比,與環(huán)氧樹脂小球的直徑和纖維直徑的比值成反比。
[Abstract]:Carbon fiber is an engineering material with excellent properties, which is often used as a reinforcement of various composites. Carbon fiber reinforced composites are the first choice for advanced composite applications due to their good mechanical properties. The interfacial bond between carbon fiber and matrix is the key to control the overall properties of composites, but the bond between carbon fiber and composite interface is weak due to the influence of inert carbon fiber surface. Therefore, it is necessary to study the surface of modified carbon fiber. In this paper, the surface modification, characterization and interfacial shear strength of carbon fiber were studied. The surface of carbon fiber was modified by microwave irradiation hydrogen peroxide oxidation method. The physical and chemical properties of carbon fiber surface were analyzed by means of field emission scanning electron microscope (SEM) and X-ray photoelectron spectroscopy (XPS), Raman spectrometer (Raman spectrometer) and laser microscopy. The interfacial shear strength of the composites was measured by microdrop embedding and pulling method, and some factors affecting the interfacial shear strength were summarized and analyzed. The effects of various technological parameters (microwave power, treatment time, concentration of hydrogen peroxide, etc.) on the surface properties of carbon fibers were investigated by means of FE-SEMX Raman and laser micrometer. By observing and analyzing the SEM images, it was found that the surface morphology of the fibers varied with the change of the treatment conditions. After the modification, there were grooves and voids on the surface of the fibers, and some special structures such as nano-sized protuberances and white spots were also found. XPS analysis showed that the oxygen content and nitrogen content on the surface of the treated fibers were increasing, the changes of treatment conditions and the content of carbon fibers were also different, and the oxygen content of the modified asphalten-based carbon fiber made by the laboratory increased the most. The increase of oxygen functional groups, such as C-O, Con O, and so on. Raman spectra show that the ratio of R value D peak to G peak increases, which indicates that microwave induced oxidation treatment increases the disorder of carbon fiber surface structure. The surface roughness of the fiber was measured by laser microscopy, and the increase of the roughness value was shown. At the same time, five types of carbon fibers have been studied, their surface morphology and surface elements have been changed, which indicates that this method is widely applicable. The interfacial shear strength of carbon fiber and epoxy resin was measured by micro-drop embedding pull method to evaluate the bond between carbon fiber and epoxy resin matrix. From the load-displacement curve, the value of the desorption force of the resin ball was read when it came off from the carbon fiber, and the state of the resin ball and the carbon fiber was observed by scanning electron microscope. Then the average value of IFSS and the standard variance and dispersion coefficient of the two samples were calculated quantitatively. The relationship between the length of IFSS and the diameter of the resin pellet and the diameter of fiber was discussed. It is found that the measured interfacial shear strength is in direct proportion to the ratio of length to diameter of epoxy resin ball, inversely proportional to fiber diameter, and inversely proportional to the ratio of the length of epoxy resin ball to fiber diameter. It is inversely proportional to the ratio of the diameter of the epoxy resin ball to the diameter of the fiber.
【學位授予單位】：湖南大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TQ342.742;TB332

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本文編號：1785414