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首页> 外文会议>International Conference on X-ray and Related Technique in Research and Industry >OXIDATIVE DEGRADATION MONITORING OF NATURAL RUBBER USING S K-EDGE X-RAY ABSORPTION NEAR-EDGE SPECTROSCOPY (XANES)
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OXIDATIVE DEGRADATION MONITORING OF NATURAL RUBBER USING S K-EDGE X-RAY ABSORPTION NEAR-EDGE SPECTROSCOPY (XANES)

机译：S K-Edge X射线吸收近边光谱（Xanes）天然橡胶氧化降解监测

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摘要

In this work, we present the results of sulfur crosslinking and degradation in natural rubber (NR) studied by X-ray absorption near-edge structure spectroscopy (XANES). Sulfur K-edge XANES spectra has been collected and analyzed to provide the geometry and electronic environment of sulfur crosslinks during vulcanization and degradation processes by ozone aging. We found that reversion took place before the onset of oxidative process at the sulfur bridge. Parallel to the oxidative process, the production of cyclic sulfanes took places. This physicochemical properties which were calculated from S K-edge XANES spectra were correlated with the mechanical of NR films by varying accelerator type. The accelerator zinc diethyldithiocarbamate (ZDEC) gave highest film strength when compared with other accelerators: N-cyclohexylbenzothiazole sulfenamide (CBS), 2,2' dibenzothiazyl disulfide (MBTS), and tetramethylthiuram disulfide (TMTD).
机译：在这项工作中，我们介绍了通过X射线吸收近边缘结构光谱（Xanes）研究的天然橡胶（NR）中硫交联和降解的结果。已经收集并分析了硫磺K-Edge Xanes光谱，以通过臭氧老化在硫化和降解过程中提供硫交联的几何和电子环境。我们发现在硫桥的氧化过程开始之前发生了恢复。平行于氧化过程，循环磺烷的生产占据了地方。通过改变促进剂型，从S k边缘XANES光谱计算的该物理化学性质与NR膜的机械相关。与其他促进剂相比，促进剂锌二乙基二硫代氨基甲酸乙酯（Zdec）得到最高的薄膜强度：N-环己基苯噻唑磺酰胺（CBS），2,2'Dihenzoothiazyl二硫化物（MBT）和四甲基硫脲二硫化物（TMTD）。

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