The disposal and accumulation of waste tire rubbers has a significant negative impact on the development of a circular economy and sustainable environment. To reuse and recycle ground tire rubber, we developed a thermal-oxidative reclamation process using a newly designed dynamic reclamation reactor. In the absence of any chemical agent, a high scission efficiency was achieved at a sol fraction of 66.53 wt % at 200 °C after 20 min from the thermal oxidation of GTR. The physical and chemical structural evolutions of GTR during the thermo-oxidation process were systemically investigated by monitoring the Mooney viscosity, sol–gel ratio, molecular weight, and chemical structure changes. The reclaimed ground tire rubber containing ultrafine fillers and soluble elastomer can be easily dispersed into a natural rubber matrix. The mechanical properties and aging resistance of the modified natural rubber were enhanced with the addition of up to 40 wt % reclaimed ground tire rubber. This work demonstrates a green and up-scalable approach for reclamation and reuse of waste tire rubbers for a sustainable rubber industry.

中文翻译：

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废旧轮胎橡胶的有效热氧化再生技术，用于生产高性能橡胶复合材料

废旧轮胎橡胶的处置和积累对循环经济和可持续环境的发展具有重大的负面影响。为了重新利用和回收磨碎的轮胎橡胶，我们使用新设计的动态再生反应器开发了一种热氧化再生工艺。在不存在任何化学试剂的情况下，自GTR的热氧化反应20分钟后，在200.C的溶胶分数为66.53 wt％时，可实现高的切割效率。通过监测门尼粘度，溶胶-凝胶比，分子量和化学结构变化，系统地研究了GTR在热氧化过程中的物理和化学结构演变。包含超细填料和可溶性弹性体的再生磨碎轮胎橡胶可以轻松地分散到天然橡胶基质中。改性天然橡胶的机械性能和耐老化性通过添加至多40 wt％的再生磨碎轮胎橡胶得以增强。这项工作展示了一种绿色且可扩展的方法，用于回收和再利用废轮胎橡胶，以实现可持续的橡胶工业。