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Studies of conventional sulfur vulcanization of SBR rubber: Analysing the reaction products from thermal degradation of the accelerator by means of MCC-IMS technique
Polymer Testing ( IF 5.1 ) Pub Date : 2020-10-01 , DOI: 10.1016/j.polymertesting.2020.106715
Dominik Pietrzak , Dariusz M. Bieliński , Daniela Henneicke

Abstract A combination of knowledge on curing process of rubber mixes with novel methods of chemical analysis, a new unconventional approach to analysis of rubber vulcanization is presented in this study. Six SBR samples containing various N-tert-butyl-2-benzothiazole sulfenamide (TBBS) accelerator: sulfur ratios (within) the range of conventional (CV) sulfur vulcanization system were studied using multi-capillary column ion mobility spectrometry (MCC-IMS) technique. For these analysis, calibration/dilution curves were established. Moreover, data from MCC-IMS were correlated with other parameters of the rubber vulcanizates – their crosslink density and structure as well as their tensile strength and modulus at elongation. For such comparison, one of the reaction products from thermal decomposition of TBBS, benzothiazole was selected. Furthermore, the concentration of benzothiazole released during the vulcanization process corresponded well with the crosslink density of the rubber vulcanizates studied. It was even possible to calculate the crosslink density from the concentration of benzothiazole determined by MCC-IMS, using Boltzmann fitting curve. The presented results could be an important contribution in understanding the mechanisms occurring during rubber vulcanization, demonstrating a new approach to testing and evaluation of the process.

中文翻译:

SBR橡胶常规硫磺硫化研究:利用MCC-IMS技术分析促进剂热降解反应产物

摘要 本研究将橡胶混合物硫化过程的知识与化学分析的新方法相结合,提出了一种新的非常规橡胶硫化分析方法。使用多毛细管柱离子迁移谱 (MCC-IMS) 研究了六个包含各种 N-叔丁基-2-苯并噻唑次磺酰胺 (TBBS) 促进剂的 SBR 样品:常规 (CV) 硫磺硫化系统范围内的硫比率(在)技术。对于这些分析,建立了校准/稀释曲线。此外,来自 MCC-IMS 的数据与硫化橡胶的其他参数相关——它们的交联密度和结构以及它们的拉伸强度和伸长率模量。为了进行这样的比较,选择了 TBBS 热分解的反应产物之一,苯并噻唑。此外,硫化过程中释放的苯并噻唑浓度与所研究的橡胶硫化胶的交联密度非常吻合。甚至可以使用 Boltzmann 拟合曲线从 MCC-IMS 确定的苯并噻唑浓度计算交联密度。所呈现的结果可能对理解橡胶硫化过程中发生的机制做出重要贡献,展示了一种新的工艺测试和评估方法。
更新日期:2020-10-01
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