Quantification by FT-IR (UATR/NIRA) of NBR/SBR blends

Abstract Rubber blends are important materials in automotive industry, as well as in other sectors. However, there are implications when suitable use of a polymer in an artifact is not made. In the automotive area, for example, the use of an elastomer without the fuel resistance requirement would result in component degradation, potential fuel leakage, and danger of fire. The use of polymer blends may be the solution to this problem. Fourier transform infrared spectroscopy (FT-IR) can be used for the knowledge of the polymer content of these blends. Then, FT-IR quantitative methodologies for determining acrylonitrile-butadiene copolymer (NBR) copolymer and butadiene-styrene copolymer (SBR) contents were developed by the transflectance accessory, NIRA, and the transmission mode, being the sample analyzed by transmission and universal attenuated total reflection (UATR) in the medium infrared (MIR). UATR and NIRA methodologies showed better accuracy. However, the MIR analysis showed a detection limit between 10-20% of NBR.摘要 橡胶共混物是汽车工业及其他领域的重要材料。然而，若未能在制品中合理选用聚合物，将引发一系列不利影响。以汽车领域为例，若使用不满足耐燃油性能要求的弹性体，会导致部件降解、燃油泄漏风险乃至火灾隐患。采用聚合物共混物或可解决这一问题。傅里叶变换红外光谱（Fourier Transform Infrared Spectroscopy, FT-IR）可用于表征这类共混物的聚合物组分含量。研究人员借助透射反射附件NIRA与透射模式，开发了用于测定丙烯腈-丁二烯共聚物（Nitrile-Butadiene Copolymer, NBR）与丁苯共聚物（Butadiene-Styrene Copolymer, SBR）含量的FT-IR定量分析方法，测试样品采用中红外（Medium Infrared, MIR）波段下的透射法与通用衰减全反射（Universal Attenuated Total Reflection, UATR）法完成分析。UATR与NIRA分析方法展现出更优的准确度，但中红外分析的NBR检出限处于10%~20%的区间内。