探讨了5种表面改性剂(NaOH、多巴胺及硅烷偶联剂KH550、KH560、KH570)对生物基PA56纤维表面改性的影响。改性后的PA56纤维经过RFL(树脂-甲醛-乳胶)浸渍工艺处理,并与橡胶材料复合制备改性纤维/橡胶复合材料。重点分析了改性剂对纤维力学性能及其与橡胶基体界面粘合性能的影响。结果表明:NaOH处理导致纤维表面蚀刻,拉伸强度有所下降;而KH550、KH560和KH570改性纤维保持了拉伸强度,并显著提高了断裂伸长率。多巴胺通过在纤维表面形成保护层,延缓了热分解过程,提高了碳残余率,但对纤维的拉伸性能影响较小。RFL处理后,改性纤维及其复合材料的H抽出力显著高于未改性纤维。各改性剂对纤维/橡胶复合材料界面粘合性能的改善效果存在显著差异,其中KH550表现出最优异的性能提升效果。
This study investigated the effects of five surface modifiers—NaOH,dopamine,and silane coupling agents KH550,KH560,and KH570-on the surface modification of bio-based PA56 fibers.The modified fibers were treated with the RFL(resorcinol-formaldehyde-latex) impregnation process and subsequently combined with rubber to fabricate modified fiber/rubber composites.The research focused on analyzing the impact of these modifiers on the mechanical properties of the fibers and their interfacial adhesion with the rubber matrix.Experimental results indicated that NaOH treatment caused etching on the fiber surface,leading to a reduction in tensile strength.In contrast,fibers modified with KH550,KH560,and KH570 retained their tensile strength and exhibited a significant improvement in elongation at break.Dopamine modification formed a protective layer on the fiber surface,which delayed thermal decomposition and increased the carbon residue rate,while having minimal impact on tensile performance.After RFL treatment,the H-pullout strength of the modified fibers and their composites was significantly higher than that of unmodified fibers.The interfacial adhesion performance of the fiber/rubber composites varied significantly among the modifiers,with KH550 demonstrating the most outstanding improvement.
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