Vulcanization systems and epoxidation degree play an important role for the microstructure and macro-property of epoxidized natural rubber (ENR). Effect of sulfur (S), dicumyl peroxide (DCP) and itaconic acid (IA) vulcanization systems on the strain-induced crystallization (SIC), molecular chain orientation and microstructure evolution of ENRs were compared by WAXD, polarized FTIR spectroscopy and AFM modulus images. Results demonstrated that ENR-10 with 10% epoxidation degree showed the best mechanical properties, and its tensile strength and elongation of break increased by 137%, 167%, and 19%, 20% compared with the ENR-10-DCP and ENR-10-IA, respectively. ENR-10-DCP and ENR-10-IA had a similar higher molecular chain orientation than ENR-10-S which resulted in the stress larger than ENR-10-S at strain lower than 1. While at high strain, the heterogeneous microstructure, rapid growth of molecular chain orientation and earliest SIC led to the mechanical properties of ENR-10-S being significantly higher than ENR-10-DCP and ENR-10-IA. In addition, compared with NR-S, the introduction of epoxy groups could promote the molecular chain orientation and SIC, thus ENR-10-S showed better mechanical strength than NR-S.

硫化体系和环氧化度对环氧化天然橡胶（ENR）的微观结构和宏观性能起着重要作用。通过 WAXD、偏振 FTIR 光谱和 AFM 模量图像比较了硫 (S)、过氧化二异丙苯 (DCP) 和衣康酸 (IA) 硫化体系对 ENR 的应变诱导结晶 (SIC)、分子链取向和微观结构演变的影响. 结果表明，环氧化度为10%的ENR-10表现出最好的力学性能，其拉伸强度和断裂伸长率比ENR-10-DCP和ENR-提高了137%、167%和19%、20%。 10-IA，分别。ENR-10-DCP 和 ENR-10-IA 具有与 ENR-10-S 相似的更高分子链取向，这导致在应变低于 1 时应力大于 ENR-10-S。在高应变下，不均匀的微观结构、分子链取向的快速增长和最早的SIC导致ENR-10-S的力学性能显着高于ENR-10-DCP和ENR-10-IA。此外，与NR-S相比，环氧基团的引入促进了分子链的取向和SIC，因此ENR-10-S表现出比NR-S更好的机械强度。