Short aramid fiber (AF)‐reinforced rubber composites (SFRRs) possess better mechanical performance than carbon black‐filled rubber in many respects. However, the performance of an SFRR depends on interfacial adhesion to a large extent. In this article, AF was treated by thermal oxidation and then used to prepare AF‐reinforced carbon black‐ethylene propylene diene monomer (CB‐EPDM) composites in the presence of maleinized liquid polybutadiene rubber as the compatibilizer. The interfacial adhesion between the AF and matrix was evaluated by means of the relative debonding energy (RDE), and the corresponding dynamic and static performance was studied. The interfacial adhesion could be improved by a combination of fiber surface treatment and rubber compatibility, and the RDE was increased. Compared with those of the unmodified AF‐reinforced CB‐EPDM, the tensile moduli at 100% and 300% elongation and the tear strength increased by 27.4%, 16.7%, and 22.9%, respectively, and the stress‐controlled fatigue life of the notched sample increased by 140%. The results showed that the RDE decreased gradually with increasing average deformation after strain‐controlled fatigue for 30 000 cycles, and the RDE remained at a higher level in the AF‐reinforced CB‐EPDM when better interfacial adhesion was formed.

中文翻译：

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热氧化和马来酸化液态聚丁二烯对短芳纶纤维增强炭黑-乙烯丙烯二烯单体复合材料动态和静态性能的影响

短的芳纶纤维（AF）增强的橡胶复合材料（SFRR）在许多方面都比炭黑填充的橡胶具有更好的机械性能。但是，SFRR的性能在很大程度上取决于界面粘合。在本文中，AF经过热氧化处理，然后在马来酸化液态聚丁二烯橡胶作为增容剂的情况下，用于制备AF增强的炭黑-乙烯丙烯二烯单体（CB-EPDM）复合材料。通过相对剥离能（RDE）评估了AF与基体之间的界面附着力，并研究了其相应的动态和静态性能。通过纤维表面处理和橡胶相容性的结合可以改善界面粘合性，并提高RDE。与未经修改的AF增强CB-EPDM相比，伸长率分别为100％和300％时的拉伸模量和撕裂强度分别增加了27.4％，16.7％和22.9％，带缺口样品的受应力控制的疲劳寿命增加了140％。结果表明，在30 000个周期的应变控制疲劳之后，RDE随着平均变形的增加而逐渐降低，并且当形成更好的界面粘附力时，AF增强的CB-EPDM中的RDE保持在较高的水平。