目的 研究国产芳纶纤维 DAF-III 表面上浆剂的主要成分及其对复合材料界面性能的影响。方法 用丙酮溶剂抽提纤维一定时间,分析对比去除上浆剂前后的纤维和抽提溶液,并制备 DAF-III 增强的聚三唑树脂复合材料,测试复合材料的力学性能。 结果 国产 DAF-III 芳纶纤维的主体结构是聚酰胺苯并咪唑,表面上浆剂主要组分是脂肪族酯类低聚物。 溶剂抽提去除了纤维表面大部分上浆剂,裸露的纤维本体存在制备过程中形成的沿纤维方向的大量沟壑;去除上浆剂后,复合材料的 ILSS 和弯曲强度分别提高了 181 . 2% 和 56 . 20% 。 结论 纤维表面上浆剂对纤维以及纤维增强的复合材料力学性能影响显著,纤维与树脂通过机械锚合和氢键作用改善界面粘接。

Objective To investigate the main component of the domestic aramid fiber ( DAF-III) sizing agents and its effect on the interfacial properties of composites. Methods The fibers were extracted by acetone for a certain period of time. The extracts and fibers before and after extraction were characterized. The DAF-III reinforced polytriazole ( PTA) composites were prepared, and the mechanical properties were tested. Results The results showed that the main molecular structure of domestic DAF-III and surface sizing agent were polyamide benzimidazole and aliphatic ester oligomer, respectively. The majority of the sizing agent was removed and plenty of grooves were formed along the axial direction on the exposed fiber consequently. The mechanical properties ( ILSS and flexural strength) of desized fiber reinforced PTA resin composite were increased by 181. 2% and 56. 20% , comparing with those of the virgin sample. Conclusion The sizing agent had a remarkable impact on both fibers and mechanical properties of DAF-III reinforced PTA composite. The fiber interacted with PTA through the mechanical interlocking and hydrogen bond.