以SiO2溶胶为壳层，聚丙烯腈(PAN)溶液为芯层，采用同轴静电纺丝法制备了PAN/SiO2同轴复合纤维. 经过预氧化，炭化处理，得到1μm的C/SiO2同轴复合纤维. 采用傅立叶红外分析仪(FTIR)、X射线衍射分析仪(XRD)、扫描电镜(SEM)表征了同轴纤维结构和纤维截面形貌，表明利用同轴静电纺丝技术在碳纤维上制备了厚度约20nm的SiO2涂层. 采用网络分析仪研究了同轴复合纤维的吸波性能，纤维质量分数为20％时，同轴复合纤维介电常数实部和虚部均比未涂层碳纤维低. 根据电磁参数采用RAMCAD软件计算了3mm厚材料反射率，在2～18GHz频率范围内，材料的最低反射率达到-17dB，对应的频率为12GHz，<-10dB的带宽为3.3GHz. 热重(DTA-TG)分析表明同轴复合纤维的抗氧化性能较未涂层碳纤维有所提高.
PAN/SiO2 coaxial fibers were prepared firstly by coaxial electrospinning using PAN as the core and SiO2 sol as shell, and then C/SiO2 coaxial fibers were obtained with an outer diameter of 1μm after oxidation and pyrolysis of the eletrospun fibers. The structure and cross-section morphologies of the C/SiO2 coaxial fibers were investigated by FTIR, XRD and SEM. The results show that SiO2 coating with thickness of about 20nm is successfully prepared on the carbon fibers. Radar absorbing properties of the C/SiO2 coaxial fibers are studied by voter network analyzer. Compared with uncoated carbon fibers, both the real part and the imaginary part of their permittivity decrease when the fiber mass fraction is 20%. The reflectivity is simulated using RAMCAD software which shows that the 3mmthick composites has an absorbing bandwidth of 3.3GHz below -10dB in the frequency range of 2-18GHz, and the lowest reflectivity is -17dB at 12GHz. DTA-TG analysis also indicates an increase in oxidation resistance of the coaxial fibers.
参考文献
| [1] | |
| [2] | |
| [3] |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%