甲基丙烯酰氧基倍半硅氧烷改性碳纤维／聚芳基乙炔复合材料界面性能

Interfacial properties of methacryl silsesquioxane modified carbon fiber/polyarylacetylene composites

利用微脱粘法、三点弯曲法、扫描电镜(SEM)、力调制模式原子力显微镜(AFM)和动态力学热分析(DMTA)研究了甲基丙烯酰氧基倍半硅氧烷(Methacryl-POSS)涂层改性前后的碳纤维增强的聚芳基乙炔(PAA)复合材料的界面性能。用Wilhelmy法研究了处理前后的碳纤维与PAA树脂的浸润性。结果表明:POSS涂层处理后的碳纤维表面粗糙度增大,与PAA树脂的浸润性提高;复合材料的界面剪切强度提高了36%,层间剪切强度提高了50%。DMTA图谱表明,POSS涂层改性后,复合材料的玻璃化转变温度提高了12℃,损耗因子降低了53%,表明复合材料的界面粘接性能得到大幅度的改善。

The effects of Methacryl POSS coating on the interfacial properties of carbon fiber/polyarylacetylene （CF/PAA） composites were studied by means of micro debonding measurement, three point bend test, scanning electron microscopy （SEM）, force modulation mode atomic force microscopy （AFM）, and dynamic mechanical thermal analysis （DMTA）. Wilhelmy method was used to study the wettability of PAA resin on the carbon fiber surface before and after treatment. The degree of surface roughness and the wettability of carbon fiber surface are both increased after POSS coating treatment. Compared with untreated CF/PAA composite, the interfacial shear strength （IFSS） and interlaminar shear strength （ILSS） of POSS coating treated composites are increased by 36% and 50%, respectively; the glass transition temperature of the CF/PAA composites modified with POSS coating is increased by 12℃ and the loss tangent （tan δ） is decreased by 53 %. The interracial bonding of CF/PAA composites can be improved effectively by using POSS coating.