Abstract The engagement of waste tires rubber as source of raw materials for different applications can be a partial solution to the great environmental problems caused by these products. In this study, waste tire rubber was devulcanized using both mechano–chemical and microwave methods. This process was achieved using different concentrations of 2-mercapto benzothiazole disulfide (MBTS) and tetramethylthiuram disulfide (TMTD) as a devulcanizing agent and different microwave devulcanizing times. The optimum content of both MBTS, TMTD and suitable microwave treatment time to make continuous film were noted. The devulcanized waste rubber was then added, at different concentrations, to virgin styrene–butadiene rubber (SBR). The thermal properties and dynamic mechanical behaviors were investigated for all blends. The thermal analysis proved that natural and styrene butadiene rubber are the main two constituents of the waste tire rubber utilized in this study. The mechanical behavior of the SBR blends remarkably improved by using 20 phr waste rubber (WR) devulcanized by 2 phr MBTS and by exposure for 2.2 min to microwaves. Storage modulus, tearing strength and tension set behaviors notably improved for all SBR/WR blends by irradiating with gamma ionizing radiation with a dose of 100 kGy and further improvement could be attained by increasing the dose up to 200 kGy.

中文翻译：

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使用机械-化学和微波方法的 SBR/脱硫废轮胎橡胶共混物的热和机械行为

摘要 利用废旧轮胎橡胶作为不同应用的原材料来源，可以部分解决这些产品造成的严重环境问题。在这项研究中，废轮胎橡胶使用机械化学和微波方法脱硫。该工艺是通过使用不同浓度的 2-巯基苯并噻唑二硫化物 (MBTS) 和四甲基秋兰姆二硫化物 (TMTD) 作为脱硫剂和不同的微波脱硫时间来实现的。记录了MBTS、TMTD的最佳含量和合适的微波处理时间来制备连续薄膜。然后将不同浓度的脱硫废橡胶添加到纯丁苯橡胶 (SBR) 中。研究了所有共混物的热性能和动态机械行为。热分析证明天然橡胶和丁苯橡胶是本研究中使用的废轮胎橡胶的主要两种成分。通过使用经 2 份 MBTS 脱硫的 20 份废橡胶 (WR) 并在微波中暴露 2.2 分钟，SBR 共混物的机械性能得到显着改善。通过用 100 kGy 剂量的伽马电离辐射照射，所有 SBR/WR 混合物的储能模量、撕裂强度和拉伸变形行为显着改善，通过将剂量增加到 200 kGy 可以进一步改善。