耐温布拉格光栅传感器用纳米蒙脱土改性环氧丙烯酸酯涂层的制备

对纳米蒙脱土(OMMT)进行改性, 用改性后的蒙脱土对环氧丙烯酸酯(EA)涂层进行改性, 并对改性后的OMMT/EA涂层进行了力学性能和热性能测试。研究表明, 加入质量分数2%改性蒙脱土的OMMT/EA涂层性能最好。OMMT的加入可提高涂层的拉伸性能、附着力和硬度, 并有效提高EA涂层的玻璃化温度, 降低其线性热膨胀系数。电镜和XRD分析表明, OMMT在OMMT/EA涂层中以单层片层均匀分布。将涂有该涂层的光纤布拉格光栅(FBG)传感器埋入复合材料中, 经一定温度与压力成型后, 与涂有未改性EA涂层的FBG传感器采集到的信号进行对比, 发现改性后涂层可明显降低FBG传感器信号滞后现象。

Preparation of OMMT/EA hybrid coating with high temperature resistance for FBG sensors

Hybrid coating of epoxy acrylate(EA) and modified nano organic montmorillonite(OMMT) was prepared for optical fiber Bragg grating(FBG) sensors. Mechanical performance testing and heat performance testing were carried on the OMMT/EA hybrid coating. The results demonstrate that, the performance of OMMT/EA coating with 2% mass fraction of nano OMMT is the best. SEM photographs and XRD analysis show that thesingle-lamellar nano OMMT is even distribution in EA. The tensile property, adhesion force, pencil hardness and glass temperature of OMMT/EA coating can be improved by adding nano OMMT, while the linear thermal expansion coefficient is decreased. FBG sensors with OMMT/EA coating and EA were embedded in the composites which processed under certain temperature and pressure, respectively. Comparing two groups of data, the results show that the modified OMMT/EA coating could obviously decrease the hysteresis of FBG sensor signals.