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首页> 外文期刊>Journal of Applied Polymer Science >Characterization of Ethylene in EP and in iPP/EP Systems by Deconvolution of IR Spectra
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Characterization of Ethylene in EP and in iPP/EP Systems by Deconvolution of IR Spectra

机译：通过红外光谱反卷积表征EP和iPP / EP系统中的乙烯

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摘要

The purpose of this study is to propose a correlation between IR spectra and molecular structure of ethylene-propylene (EP) copolymers possibly blended with isotactic polypropylene (iPP). The method is based on the deconvolution of the spectrum in the CH_2-rocking range, i.e.,800-680 cm~(-1), where the bands of interest overlap. The six bands present in this region were signal averaged in position and width. The spectra were then deconvoluted (curve fitted) assuming a Lorentzian shape for the bands. The band at 1167 cm~(-1)(with a shoulder at 1156 cm~(-1)) corresponding to a CH_3 vibration is considered as an internal standard. The method was checked by varying some fitting parameters. In order to realize some quantitative measurements, calibration curves were established with some EP samplex, characterized by ~(13)C NMR, which were used as standards. The amounts of total-(CH_2-CH_2)- units (ethylene units), isolated ethylene and structural defaults in PP were determined for different iPP/EP blends. Ethylene crystallinity has also been determined. A good correlation was evidenced between infrared and ~(13)C NMR measurements.
机译：这项研究的目的是提出红外光谱与可能与全同立构聚丙烯（iPP）共混的乙烯-丙烯（EP）共聚物的分子结构之间的关系。该方法基于在CH_2摇摆范围（即800-680 cm〜（-1））中光谱的反褶积，其中感兴趣的谱带重叠。在该区域中出现的六个波段在位置和宽度上平均信号。然后，假定谱带为洛伦兹形状，对光谱进行反卷积（曲线拟合）。对应于CH_3振动的1167 cm〜（-1）（肩部位于1156 cm〜（-1））的带被视为内标。通过改变一些拟合参数来检查该方法。为了实现一些定量测量，使用了一些以〜（13）C NMR为特征的EP样品建立了标准曲线。对于不同的iPP / EP共混物，确定了PP中的总（CH_2-CH_2）-单元（乙烯单元），分离的乙烯和结构默认值的数量。乙烯的结晶度也已确定。红外和〜（13）C NMR测量之间存在良好的相关性。

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