【摘要】 氦等离子体处理纳米二氧化硅溶胶涂覆T300碳纤维能构造出特定空间结构形态的纳米涂覆层.扫描电子显微镜照片显示,经氦等离子体处理后纳米二氧化硅溶胶涂覆T300碳纤维的纳米涂覆层在纤维表面分布均匀,起到填补纤维表面微观缺陷的功能.X射线光电子能谱及傅里叶变换红外光谱显示,纤维表面被引入了活性官能团,纳米二氧化硅涂覆层与碳纤维间有表面激活反应.形成纳米界面结构的T300碳纤维表面与纳米二氧化硅涂覆层间的相互作用符合艾琳方程,利用热激活体积可以对其相互作用进行定量分析.拉伸试验表明,屈服塑性变形导致纳米界面结构热激活,纳米微粒阻碍碳纤维表面大分子链形貌变化的热激活体积是纳米界面结构性能的重要表征.更多还原

【Abstract】 The purpose of the present work is to investigate the effects of helium plasma treatment on tensile deformation of nano-SiO₂ sol-gel coating T300 carbon fiber and provide a new concept for the nano-structural interphase between fiber surface and nano-coating.The tensile test results show that the activation volumes of T300 carbon fibers untreated and treated with helium plasma ranging from 681.9628 to 32342 nm 3 by following Eyring’s equation are important descriptors for the properties of the nano-structural interface between fiber surface and nano-coating,and the ductility of the nano-SiO₂ sol-gel coating T300 carbon fibers treated by helium plasma is enhanced.From the results of the scanning electron microscope,X-ray photoelectron spectroscopy and Fourier transform infrared spectroscopy,it is found that the uniform dispersion of the nano-SiO₂ coating of the T300 carbon fibers treated by helium plasma can not only fill the micro-flaws,but also cause the occurrence of effective activation surface interaction between carbon fibers and nano-SiO 2 coating,along with the introduced activated functional groups on the fiber surfaces.更多还原