Monomer sequence distribution in ethylene-propylene copolymers by computer analysis of infrared spectra

Drushel, Harry V.; Ellerbe, Julia S.; Cox, Robert C.; Lane, Lloyd H.

doi:10.1021/ac60258a002

Cited by 36 publications

(6 citation statements)

References 25 publications

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“…The half width at 722 cm −1 was finally estimated to a value of 14.5 cm −1 . All these values are reported in Table 2 and agree with the results of Drushel et al26…”

Section: Resultssupporting

confidence: 91%

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

Daoust

Bebelman

Chaupart

et al. 2000

J. Appl. Polym. Sci.

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ABSTRACT: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 Ϫ1, 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 Ϫ1 (with a shoulder at 1156 cm Ϫ1 ) 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 samples, characterized by 13 C NMR, which were used as standards. The amounts of total O(CH 2 OCH 2 )O 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.

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“…The half width at 722 cm −1 was finally estimated to a value of 14.5 cm −1 . All these values are reported in Table 2 and agree with the results of Drushel et al26…”

Section: Resultssupporting

confidence: 91%

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

Daoust

Bebelman

Chaupart

et al. 2000

J. Appl. Polym. Sci.

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“…As pointed out by Kuhn et al, aromatic bending vibrations are not the only bands that are observed in this region; methylene bending vibrations are also found here. ,, However, these vibrations have low intensities. Particularly, bands are found near 722, 726, 735, 752, 770, 815, and 858 cm -1 .…”

Section: Methods and Resultssupporting

confidence: 76%

“…Their number appeared to be more than was needed to provide good fits to our data. Drushel et al found, in quantitative analysis of ethylene−propylene copolymer blends, that they obtained a better fit to their data when they included a band at 770 cm -1 . It is possible that the 764 and the 784 cm -1 bands in our case might correspond to a broad band.…”

Section: Methods and Resultsmentioning

confidence: 61%

On the Use of Infrared Spectroscopy To Determine Hydroxyl Content and Reactivity of O−Acetylated and O−Alkylated Coals

Dyrkacz

Bloomquist

1998

Energy Fuels

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Infrared spectroscopy was used to examine the O-alkylation and O-acetylation of two bituminous coals with a series of reagents. Two related aspects were investigated: We attempted to apply quantitative methods to calculate the reactivity using the hydroxyl absorption bands and to calculate the total alkyl or acyl groups incorporated using specific coal bands. The latter work showed that the use of IR coal bands to determine the amount of added groups can only be used qualitatively due to unpredictable changes in the coal band intensities. Quantitative monitoring of the hydroxyl groups showed that, in some reactions, more hydroxyl was found in the coal after reaction, suggesting that there was little reaction and mostly trapping of hydrolyzed reagent into the coal.

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“…The FTIR of PP does not reveal much of information probably because the C–Cl vibration frequency is masked by the frequency of the propylene chain sequence and the −CH 2 – rocking vibrations that appear broadly near 700 cm –1 . 43,44 However, there is a sharp indication of a nonhydrogen-bonded −OH stretching at 3734 cm –1 in the treated PP; the peak is likely to be caused due to the hydroxylation by HOCl. 45…”

Section: Resultsmentioning

confidence: 99%

Effect of Aqueous HCl with Dissolved Chlorine on Certain Corrosion-Resistant Polymers

et al. 2018

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Polypropylene, poly(ethylene terephthalate), ethylene chloro tetrafluoroethylene, ethylene tetrafluoroethylene, and epoxy vinyl ester resin (Derakane 470-300) were evaluated in aqueous HCl containing chlorine gas at high temperature as a corrosion media. Fourier transform infrared, X-ray diffraction, energy-dispersive X-ray, and dynamic mechanical analyzer are used for identification of nature of chemical reactions on polymer chain. Puncture resistance and hardness tests were done to evaluate the mechanical strength after the exposure. The scanning electron microscopy image was taken to check the morphological change of polymer surface. Chlorination and oxidation reactions were observed to be responsible for the stability behavior of polymer. A mechanism proposed for both chlorination and oxidation on polymer.

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Monomer sequence distribution in ethylene-propylene copolymers by computer analysis of infrared spectra

Cited by 36 publications

References 25 publications

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

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

On the Use of Infrared Spectroscopy To Determine Hydroxyl Content and Reactivity of O−Acetylated and O−Alkylated Coals

Effect of Aqueous HCl with Dissolved Chlorine on Certain Corrosion-Resistant Polymers

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