Abstract A nondestructive method of evaluating the curing degree (crosslinking density) of cured rubbers and their nanocomposites based on attenuated total reflection Fourier-transform infrared (ATR-FTIR) spectroscopy was proposed and applied to fluorine-based rubber (FKM), in which triallyl-isocyanurate (TAIC) was employed as a curing agent. ATR-FTIR spectroscopy demonstrated that the C=O band in TAIC at 1699 cm-1 decreased in intensity and broadened as the curing reaction progressed. A calibration model relating the crosslinking density in the FKM with the full width at half maximum (FWHM) of the band of the C=O bond was developed. The model showed good applicability to both FKM and FKM nanocomposites with various nanofillers, including single- and multi-walled carbon nanotubes (CNTs), carbon black and silica particles. Interestingly, when the fillers, especially CNTs, were added to the rubber, the FWHM was more sensitive to the change in the crosslinking density than the change in the Young’s modulus.

中文翻译：

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基于ATR-FTIR光谱的橡胶及其纳米复合材料硫化度评价新方法

摘要 提出了一种基于衰减全反射傅里叶变换红外 (ATR-FTIR) 光谱法评价硫化橡胶及其纳米复合材料的硫化程度（交联密度）的无损方法，并将其应用于氟基橡胶（FKM），其中三烯丙基-异氰脲酸酯（TAIC）用作固化剂。ATR-FTIR 光谱表明，随着固化反应的进行，TAIC 中 1699 cm-1 处的 C=O 带强度降低并变宽。开发了将 FKM 中的交联密度与 C=O 键带的半高全宽 (FWHM) 相关联的校准模型。该模型对具有各种纳米填料的 FKM 和 FKM 纳米复合材料显示出良好的适用性，包括单壁和多壁碳纳米管 (CNT)、炭黑和二氧化硅颗粒。有趣的是，