叠氮苯并咪唑偶联剂增强国产芳纶Ⅲ/聚三唑树脂复合材料界面

Interfacial reinforcement of domestic aramid fiber Ⅲ/PTA composites using azide-containing benzimidazole coupling agent

通过分子设计制备合成了含叠氮及苯并咪唑双官能团的偶联剂Azido-Benzimidazole(ABI),并考察了新型偶联剂对国产芳纶Ⅲ(DAF-Ⅲ)/聚三唑树脂(PTA)复合材料的界面增强作用。SEM、傅立叶变换衰减全反射红外光谱(ATR-FTIR)及XPS分析表明,ABI通过分子结构中的苯并咪唑基团与DAF-Ⅲ纤维形成分子间氢键,能够作用到DAF-Ⅲ上。FTIR及DSC分析表明,ABI中的叠氮基团与PTA树脂中的炔基发生反应,生成三唑环参与了PTA树脂的固化。经2.1wt%ABI处理后,DAF-Ⅲ/PTA树脂复合材料层间剪切强度(ILSS)和弯曲强度分别较未处理时提高了62.0%和43.7%。

A new type of coupling agent Azido-Benzimidazole（ABI）containing benzimidazole and azide groups was designed and prepared in this study.And ABI was added into the domestic aramid fiberⅢ（DAF-Ⅲ）/polytriazole（PTA）composites to reinforce their interfacial properties.The results of SEM,Attenuated Total internal Reflectance Fourier Transform Infrared Spectroscopy（ATR-FTIR）and XPS show that ABI can bond with the fiber by intermolecular hydrogen;FTIR and DSC results indicate that the azide group in ABI can react with alkynyl in PTA and take part in the curing process synchronously.The mechanical performances of DAF-Ⅲ/PTA composite are improved greatly after ABI modification.The Inter Laminar Shear Strength（ILSS）and flexural strength increase by 62.0% and 43.7%respectively after 2.1wt% ABI treatment compared with those of untreated composites.