AZ-1改性炭纤维/聚三唑复合材料界面研究

Investigation on Interface of AZ-1 Modified Carbon Fiber Reinforced Polytriazole Composites

研究了一种用氮丙啶处理炭纤维的方法在新型聚三唑树脂复合材料中的界面作用效果和作用机理。用硝酸氧化处理炭纤维,再引入分子结构中含氮丙啶环的化合物AZ-1,通过化学手段对炭纤维进行改性。结果表明,经改性后炭纤维增强聚三唑树脂复合材料比未处理复合材料的层间剪切强度提高86%。AFM,SEM和接触角测试表明化学改性增加了炭纤维的表面粗糙度和极性,提高了炭纤维与聚三唑树脂间的界面黏结;XPS测试进一步证明,炭纤维经硝酸氧化处理后,在纤维表面生成了酸性基团;AZ-1中的氮丙啶环常温下可在氧化了的炭纤维表面开环,形成胺基类化合物,改善了与聚三唑基体之间的界面作用。

Interface modification effect and mechanism of novel polytriazole-matrix composites with the treatment of carbon fiber by aziridine were studied.The carbon fibers were modified by nitric acid oxidation followed with introduction of the coupling agent AZ-1 containing aziridine ring.The results showed that the interlaminar shear strength（ILSS） of treated carbon fiber/polytriazole composites was improved almost by 86% compared with untreated composites.AFM,SEM and contact angles characterizations suggested chemical modification could enhance surface roughness and polarity,and improve ILSS of carbon fiber/polytriazole composites.XPS results further indicated that acidic groups were introduced onto surface after nitric acid oxidation,then the aziridine ring of AZ-1 would be opened to create amine compounds onto the surface of oxidized carbon fiber at room temperature,which improved effects of the interface between polytriazole and carbon fiber.