乙醇对碳纤维复合材料界面的影响

为了研究碳纤维复合材料(CFRPs)界面结构在乙醇作用下的变化,通过原位观察树脂和纤维尺寸,提出了一种CFRPs界面表征方法。利用碳纤维和环氧树脂制备横截面试样和层板试样,并用乙醇对其进行处理,接着采用环境可控原子力显微镜(ECSPM)对试样界面附近形貌进行原位升温表征,并通过短梁剪切试验分析试样的层间剪切性能。结果表明,经乙醇处理后,CFRPs界面附近树脂发生膨胀,并且试样在加热过程中发生显著的树脂收缩和纤维膨胀;乙醇处理对CFRPs的层间剪切强度和失效模式的影响并不明显。

Effect of Ethanol on the Interface of Carbon Fiber Reinforced Polymers Composites

Carbon fiber reinforced polymer composites(CFRPs)have been widely used in the fields of astronautics and aviation due to their superior strength,modulus as well as the potential of being tailored for various applications.As a twocomponent material,the interface between a fiber and matrix is very important for the properties of CFRPs.Therefore,the interfacial characterization is of specific interest in understanding and tailoring the performance of CFRPs,in which microscopic characterization is a research hotspot.Atomic force microscope(AFM)is an effective tool for characterizing the topography and properties of different types of materials.However,employing AFM to characterize the interfaces in CFRPs is very rare.Solvents are often used to clean the composites,but the potential effects of solvents on the composites have not been fully understood.In order to study the evolution of interfacial structure of CFRPs under the effect of ethanol,a characterization method on the CFRPs interface involving the in situ observation of size of the resin and the fiber was proposed.The cross-section and laminate samples were prepared with carbon fibers and epoxy resin,and treated with ethanol.The morphology near the interface of the samples was measured by an environment control scanning probe microscopy(ECSPM)with in situ heating,and the interlaminar shear properties of the samples were analyzed by short beam shear tests.The results showed that the resin around the interface expanded after the ethanol treatment.During the heating process,the resin shrinkage and the fiber expansion of CFRPs treated with ethanol occurred remarkably.However,the interlaminar shear strength and the failure modes of CFRPs were not significantly affected by the ethanol treatment.In summary,short-term ethanol treatment may have a potential impact on the surface properties of CFRPs during its function,but not enough on its shear resistance.