The effects of ZnO particle size on crosslinking and thermal aging behavior of natural rubber (NR) were investigated. NR vulcanizates filled with nano ZnO allowed higher crosslink density, lower polysulfide crosslink, and stronger mechanical properties than those filled with micro ZnO. After thermal aging, NR filled with nano ZnO exhibited much more stable chemical and mechanical properties. The high crosslink density as well as the formation of more stable mono- and di-sulfidic crosslinks was attributed to the good dispersion and high surface area of the nano ZnO.

中文翻译：

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ZnO粒径对天然橡胶硫化胶热老化性能的影响

研究了ZnO粒径对天然橡胶（NR）的交联和热老化行为的影响。与填充微型ZnO的NR硫化橡胶相比，填充纳米ZnO的NR硫化胶具有更高的交联密度，更低的多硫化物交联和更强的机械性能。在热老化之后，填充有纳米ZnO的NR表现出更加稳定的化学和机械性能。高交联密度以及更稳定的单硫和双硫交联的形成归因于纳米ZnO的良好分散性和高表面积。