In-situ FTIR investigation of isomerisation of cis-butadiene rubber during the vulcanization

硫化 异构化 傅里叶变换红外光谱 材料科学 天然橡胶 硫黄 等温过程 高分子化学 化学工程 有机化学 化学 复合材料 催化作用 热力学 冶金 物理 工程类
作者
Jiwen Liu,Hailing Dong,Yongjie Ma,Ping Jiang,Gerhard Ziegmann,Shugao Zhao,Hongying Zhao
出处
期刊:Journal of materials research and technology [Elsevier]
卷期号:24: 9491-9499 被引量:3
标识
DOI:10.1016/j.jmrt.2023.05.157
摘要

The physical properties of cis-butadiene rubber (BR) have been shown to be critically dependent on its stereoregularity. In this work, the evolution process and influencing factors of cis-trans isomerisation of BR based on the conventional formulation system during its vulcanization process are systematically investigated using in-situ Fourier transform infrared spectroscopy (FTIR) technology. The results show that the isomerisation occurs in the BR compound with sulphur vulcanization system in both non-isothermal and isothermal vulcanization processes because of the polysulfide bonds formed by sulphur in the system, and it is more obvious than that with dicumyl peroxide (DCP) vulcanization system. The degree of isomerisation shows a positive correlation with the sulphur dosage and can reach 10% with 3 phr sulphur. Experiments also prove that zinc oxide (ZnO) and antioxidants have a significant inhibitory effect on the isomerisation during the vulcanization. The isomerisation degree of BR/ZnO-4 is reduced by half compared to that of BR/ZnO-0. The effect of antioxidant poly (1,2-dihydro-2,2,4-trimethyl-quinoline) (RD) is greater than that of N-1,3-dimethylbutyl-N′-phenyl-p-phenylenediamine (6PPD) due to its higher activity. The isomerisation of BR compound in the vulcanization is not affected significantly by the accelerator types. Besides, the isomerisation degree of Nd-BR with higher chain regularity is lower than that of Ni-BR with the same vulcanization system. The investigation above provides new perspectives and inspirations for the optimization of formula and scientific analysis on the structure-property relationship of BR composite.

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