拉曼光谱
共焦
近红外反射光谱
材料科学
红外线的
反射率
反射(计算机编程)
漫反射红外傅里叶变换
漫反射
天然橡胶
光学
分析化学(期刊)
复合材料
近红外光谱
化学
色谱法
物理
计算机科学
催化作用
光催化
生物化学
程序设计语言
作者
Alan Passero,K M Ferreira,Milton Faria Diniz,Natália Beck Sanches,Javier Carlos Quagliano Amado,Rita de Cássia Lazzarini Dutra
标识
DOI:10.1590/0001-3765202420230387
摘要
The blend of butadiene and acrylonitrile copolymer (NBR) with natural poly-cis-isoprene (NR) shows increased resistance to swelling in solvents in comparison to the individual components. In aerospace, NBR rubber is used as thermal protection for rockets and shall not contain other polymers, even in low contents, otherwise, it can affect the protection performance and rocket safety by causing detachment of the elastomer/propellant interface; therefore, this investigation presents methodologies to determine the NR/NBR contents. This study explores different analytical techniques, such as Raman spectroscopy and Fourier transform infrared (FTIR) spectroscopy, in the mid-infrared (MIR) by reflection and in the near-infrared by reflectance (NIRA) modes, Furthermore, quantification strategies by univariate, bivariate and multivariate (chemometric) models are evaluated and compared. A proposed methodology, based on multivariate Raman microscopy with partial least squares regression (PLS), showed high linearity (R2 > 0.99) and low error (< 0.82 %). The validation of FT-MIR data for the CH3, which presented lower error (1.3%) than vinylidene band (6%), showed that both methodologies (reflection and NIRA reflectance) can be used for the quantification of NR in NR/NBR. These results constitute a contribution to the state of the art in researching industrial and aerospace elastomeric applications.
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