关键词: 乙丙橡胶, 结合乙烯量, 红外光谱, 偏最小二乘

Abstract: Quantitative calibration models for fast determination of bound ethylene content in ethylene-propylene rubber were established by partial least square regression based on data of 13C NMR measurement combined with information from mid-infrared spectroscopy. Parameters affected the models were optimized and the correlation between spectra and bound ethylene content was analyzed. Results show that in the wave number range of 600-1 300 cm-1, the absorption of -CH2- group, the vibrational absorption between end group of ethylene and -C-C- have great coherence with the bound ethylene content, models based on second order derivative spectra are in better quality. The results of validation show that under the model application scope, the deviation of bound ethylene contents between predicted value and actual measurement is within ±1.5%, which could meet the requirement of quantitative analysis during industrial production.

Key words: ethylene-propylene rubber, bound ethylene content, infrared spectroscopy, partial least square regression