空气氧化刻蚀提高PAN基炭纤维抗拉强度的研究

用空气氧化刻蚀（附浸渍预处理）的方法对通用级（类似T－300）PAN基炭纤维进行处理。以NaOH,HNO3,H2SO4,(H2SO4 KMnO4)为浸渍液，研究了直接空气氧化刻蚀中的氧化温度，氧化时间，浸渍液浓度等因素对炭纤维抗拉强度的影响。结果表明：在优化工艺条件下，炭纤维的抗拉强度可由3．73GPa提高到4．52GPa。     

气液双效法对碳纤维力学性能的影响

讨论了气液双效法表面处理对炭纤维力学性能，特别是对抗拉强度和断裂伸长的影响。证明气液双效法表面处理能明显提高炭纤维的抗拉强度的断裂伸长，其效果浸润涂层后炭纤维的增重量和气相氧化程度有关。对抗拉强度较低的炭纤维其补强效果更好。     

空气氧化法对CFRP力学性能的影响

讨论了炭纤维经瞬时高温空气氧化法表面处理后，炭纤维增强树脂基复合材料的力学性能。特别是层间剪切强度的变化情况。结果表明瞬时高温空气氧化法表面处理能提高ＣＦＲＰ的界面粘结强度，其ＩＬＳＳ随空气氧化温度提高而提高。虽然ＩＬＳＳ也能提高到９０ＭＰａ以上，但同时增加了复合材料的脆性炭纤维抗位强度也会严重下降。     

气液双效法对炭纤维力学性能的影响

讨论了气液双效法表面处理对炭纤维力学性能,特别是对抗拉强度和断裂伸长的影响。证明气液双效法表面处理能明显提高炭纤维的抗拉强度和断裂伸长、其效果与浸润涂层后炭纤维的增重量和气相氧化程度有关。对抗拉强度较低的炭纤维其补强效果更好。     

电解氧化刻蚀提高抗拉强度的研究

用电解氧化刻蚀的方法，对通用级（类似T－300型）PAN基炭纤维进行处理。研究了电解电流密度、电解液浓度、电解处理时间对炭纤维抗拉强度的影响。结果表明：在优化工艺条件下，炭纤维的抗拉强度可由3.73GPa提高到5.21GPa。利用X射线粉末衍射、X射线光电子能谱、扫描电子显微镜、氮气吸附法等测定了处理前后炭纤维的微晶尺寸、表面官能团、表面形貌、比表面积和表面孔径的变化，探讨了电解氧化刻蚀提高炭纤维抗拉强度的机理。     

炭纤维增强热塑性工程塑料的研制

研究炭纤维在尼龙、聚甲醛两种工程塑料中的含量对复合材料抗拉强度、冲击强度及耐磨性的影响，并利用扫描电子显微镜观察复合材料的界面结构。结果表明，在CF／PA1010复合材料中，当炭纤维含量达到30％时，抗拉强度达到127．6MPa，耐磨性显著提高。     

XRD对表面处理炭纤维表面结构的分析

利用XRD分析了瞬时高温空气氧化法和气液双效法表面处理对炭纤维表面结构，特别是激昂厚度的变化。结果表明经表面处理后炭纤维表面有细晶化的趋势，这将有利于CFRP的界面粘结。     

沥青基炭纤维气-液混合不熔化工艺的研究北大核心

常用的沥青基炭纤维空气不熔化工艺耗费时间比较长,一定程度上增加了制作成本。为了提高沥青基炭纤维不熔化工艺效率,采用硝酸和空气氧化法复合工艺对沥青基纤维进行交联不熔化处理。该工艺吸取了硝酸氧化速度快的优点,又保留了气相氧化法微观结构好的优势。结果表明,在5%硝酸氧化25 min后继续采用空气氧化达到沥青基纤维的不熔化,进一步炭化所得的沥青基炭纤维比单纯空气氧化法得到的炭纤维性能高,同时整个不熔化时间有所减少,提高了不熔化生产效率。     

炭纤维空气氧化动力学分析

应用均匀减厚模型和自催化模型以及Sestak和Satava分别提出的许多不同的机理函数,对空气氧化和气液双效法表面处理CF表面的空气氧化进行动力学分析。结果表明炭纤维空气氧化符合均匀减厚收缩模型和FI反应动力学模型。     

RAMAN光谱对表面处理炭纤维表面结构的分析

利用Raman光谱分析了瞬时高温空气氧化法和气液双效法表面处理对炭纤维表面结构，特别是微晶大小和表面无化程度的变化。得出经表面处理后炭纤维表面有细晶化和无序化程度增加的趋势，这将有利于CFRP的界面粘结和层间剪切强度的提高。     

电化学氧化处理对碳纤维及EP复合材料性能的影响

利用电化学氧化法对碳纤维（CF）进行表面改性处理,并将改性CF用于改性环氧树脂（EP）,研究了CF处理前后纤维复丝拉伸强度和EP／CF复合材料的力学性能。结果表明,氧化处理改善了CF与基体的粘结性;经电化学氧化处理后CF的表面羟基含量提高39．96％,羧基／酯基含量提高141．06％,活性碳原子数增加34．28％;随着氧化电流密度的增加,CF复丝的拉伸强度和复合材料的层间剪切强度均呈现先增大后减小的变化趋势,当电流密度为0．2A／m^2时,复合材料的层间剪切强度提高31．70％。     

Evaluation of tribological performance of surface‐treated carbon fiber‐reinforced thermoplastic polyimide composite

The effect of surface treatment [rare earth solution (RES) and air oxidation] of carbon fibers (CFs) on the mechanical and tribological properties of carbon fiber‐reinforced polyimide (CF/PI) composites was comparatively investigated. Experimental results revealed that surface treatment can effectively improve the interfacial adhesion between carbon fiber and PI matrix. Thus, the flexural strength and wear resistance were significantly improved. The RES surface treatment is superior to air oxidation treatment in promoting interfacial adhesion between carbon fiber and PI matrix. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 2008     

体育器材用CFRPA6复合材料的制备及其性能

采用碳纤维(CF)改性聚酰胺(PA)6,从而获得PA 6/CF复合材料。结果表明:CF被浓硝酸氧化后,表面会引入碳氮、碳氧等极性基团,增加了PA 6与CF的界面反应活性;CF经浓硝酸处理后表面有许多沟槽出现,增大的表面积对PA 6与CF间机械锁合有利;随着浓硝酸处理CF时间的延长,复合材料的悬臂梁缺口冲击强度略有提高,拉伸强度提高较大;CF被过度氧化时,复合材料的缺口冲击强度、拉伸强度均降低;经浓硝酸氧化处理后,增强了CF界面黏结效果,CF被PA 6紧密包覆,断裂时两者有黏结现象发生;未经浓硝酸处理的样条在纤维拔出后会留下大量空洞,经浓硝酸处理后CF表面极性基团增加,提高了CF与基体树脂的黏结强度。     

C型炭纤维阳极氧化处理及其增强ABS复合材料的研究

以NH4NO3为电解质,对C型通用级沥青基炭纤维在不同条件下进行阳极氧化表面处理,并通过SEM、力学性能测试等方法考察了纤维及其复合材料的性能,发现经氧化处理后,炭纤维表面粗糙度和含氧官能团如C-O、C=O、COOH等数目明显增大,CF/ABS复合材料的界面粘结性得到有效地改善;复合材料的拉伸强度、弯曲强度及模量有所提高,断裂形式由纤维拔出转变为纤维断裂。     

Effect of surface treatment on the tribological performance of carbon fiber reinforced thermoplastic polyimide composites

The effect of rare earth solution (RES) surface treatment of carbon fibers (CFs) on the tensile strength and tribological properties of CF‐reinforced polyimide (CF/PI) composite was investigated. Experimental results revealed that the tensile strength of RES‐treated CFs reinforced PI composite was improved by about 19% compared with that of untreated composite, while 7% improvement was achieved by air oxidation. Compared with the untreated and air‐oxidated CF/PI composite, the RES‐treated composite had the lowest friction coefficient and specific wear rate under given applied load and reciprocating sliding frequency. RES treatment effectively improved the interfacial adhesion between CFs and PI. The strong interfacial adhesion of the composite made CFs not easy to detach from the PI matrix and prevented the rubbing‐off of PI, and accordingly improved the friction and wear properties of the composite. POLYM. COMPOS., 2009. © 2008 Society of Plastics Engineers     

Effects of surface treatment of carbon fiber: Tensile property,surface characteristics,and bonding to epoxy

In this article, effects of electrochemical oxidation and sizing treatment of PAN‐based carbon fibers (CFs) on the tensile properties, surface characteristics, and bonding to epoxy were investigated. As found, the electrochemical oxidation improves the tensile strength of single CF by 16.0%, due to weakening the surface stress concentration and smoothing the surface structure. Further sizing treatment shows a negligible effect on the tensile strength. Both oxidation and sizing treatments significantly improve the wettability and surface energies of CFs by introducing oxygen‐containing functional groups. Microbond test was conducted to characterize the interfacial shear strength (IFSS) between a single fiber and an epoxy droplet. The oxidation treatment increases IFSS slightly, which is due to the contradictory effects of the formation of chemical bonds between the resin and CFs, and the reduced mechanical interlocking. Further sizing treatment significantly enhances IFSS from 73.6 to 81.0 MPa, due to the formation of vast chemical bonds. Furthermore, the oxidation and sizing treatment can effectively reduce the degradation of IFSS to the hygrothermal ageing for the CF/epoxy system. POLYM. COMPOS., 37:2921–2932, 2016. © 2015 Society of Plastics Engineers     

Interfacial adhesion of plasma‐treated carbon fiber/poly(phthalazinone ether sulfone ketone) composite

Interfacial adhesion between fiber and matrix has a strong influence on composite mechanical performance. To exploit the reinforcement potential of the fibers in advance composite, it is necessary to reach a deeper understanding on the relation between fiber surface treatment and interfacial adhesion. In this study, air plasma was applied to modify carbon fiber (CF) surface, and the capability of plasma grafting for improving the interfacial adhesion in CF/thermoplastic composite was discussed and also the mechanism for composite interfacial adhesion was analyzed. Results indicated that air plasma treatment was capable of increasing surface roughness as well as introducing surface polar groups onto CF; both chemical bonding and mechanical interaction were efficient in enhancements of interlaminate shear strength of CF/PPESK composite, while mechanical interaction has a dominant effect on composite interfacial adhesion than chemical bonding interaction. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2007