傅立叶变换红外吸收光谱法测定_改性聚丙烯材料中苯乙烯-乙烯-丁烯-苯乙烯含量

目的: 建立改性聚丙烯材料中苯乙烯-乙烯-丁烯-苯乙烯(SEBS)含量的测定方法。 方法: 将实验材料热压成膜,记录红外吸收光谱图,根据朗伯-比尔定律,用苯乙烯与聚丙烯对应特征吸收校正峰高的相对比值直接测定改性聚丙烯材料中SEBS含量。 结果: SEBS含量在2%~20%范围内与吸收峰高的线性关系良好,r＝0.9996;SEBS的LOD和LOQ分别为0.3%和1.0%;平均回收率为103.1%。 结论: 傅立叶变换红外吸收光谱法可用于改性聚丙烯材料中SEBS含量的测定。

Objective: To establish a method for determination of the content of styrene-ethylene-butylene-styrene(SEBS) in modified polypropylene materials. Methods: The materials were hot-pressed into membranes and infrared absorption spectra were acquired.According to the Lambert-Beer law,the ratio of the specific peak height of styrene to that of polypropylene was calculated to determine SEBS content. Results: The linear range of SEBS content was from 2% to 20% with a correlation coefficient of 0.9997.The LOD and the LOQ of SEBS were 0.3% and 1.0% respectively.The average recovery of the method was 103.1%. Conclusions: The FT-infrared absorption spectrometric method is suitable for the determination of SEBS content in modified polypropylene materials.

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