Characterization of ethylene in EP and in iPP/EP systems by deconvolution of IR spectra

摘要: The purpose of this study is to propose a correlation between IR spectra and molecular structure ethylene-propylene (EP) copolymers possibly blended with isotactic polypropylene (iPP). method based on the deconvolution spectrum in CH2-rocking range, i.e., 800-680 cm(-1), where bands interest overlap. six present region were signal averaged position width. then deconvoluted (curve fitted) assuming Lorentzian shape for bands. band at 1167 cm(-1) (with shoulder 1156 cm(-1)) corresponding CH3 vibration considered as an internal standard. was checked by varying some fitting parameters. In order realize quantitative measurements, calibration curves established EP samples, characterized C-13 NMR, which used standards. amounts total -(CH2-CH2)- units (ethylene units), isolated ethylene structural defaults PP determined different iPP/EP blends. Ethylene crystallinity has also been determined. A good evidenced infrared NMR measurements. (C) 2000 John Wiley & Sons, Inc.