High-performance rubber composites can be obtained by combining the strength of fiber with the high elasticity of rubber. In this article, environmentally friendly natural rubber (NR)/carbon (CB) composites reinforced by maleic anhydride (MAH) grafted hemp fiber (HF) in the presence of polyhydric hyper-branched polyester (PHP) were studied. The grafting of MAH on the surface of HF (HF-MAH) improves the roughness of fibers, the introduced C=C participates in rubber covulcanization with NR matrix at high temperature, thus enhancing the physical locking and chemical crosslinking between HF and NR matrix. The bridge effect was produced between HF-MAH and rubber matrix by PHP, and the interfacial adhesion was further enhanced. As a result, the tensile strength, tear strength, and elongation at break were improved by approximately 14.5, 26.2, and 10.8%, respectively. The 100 and 300% constant elongation stress was increased by 134 and 113%, and the cutting resistance was also improved obviously.

中文翻译：

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多元超支化聚酯增强大麻纤维/天然橡胶复合材料的性能

通过将纤维的强度与橡胶的高弹性相结合，可以获得高性能的橡胶复合材料。本文研究了在多元超支化聚酯（PHP）存在下，由马来酸酐（MAH）接枝的大麻纤维（HF）增强的环保天然橡胶（NR）/碳（CB）复合材料。MAH在HF表面的接枝（HF-MAH）改善了纤维的粗糙度，引入的C = C参与橡胶与NR基体在高温下的硫化，从而增强了HF与NR基体之间的物理锁定和化学交联。PHP在HF-MAH和橡胶基体之间产生了桥梁效应，界面粘合力进一步增强。结果，拉伸强度，撕裂强度和断裂伸长率分别提高了约14.5、26.2和10.8％，分别。100％和300％恒定伸长应力分别增加134％和113％，并且抗切割性也明显提高。