Determination of methylene groups in chains of saturated hydrocarbons on the basis of infrared absorption spectra

1974 ◽  
Vol 10 (5) ◽  
pp. 406-409 ◽  
Author(s):  
R. A. Pushkina ◽  
A. Ya. Kuklinskii
Keyword(s):  
Absorption Spectra ◽  
Infrared Absorption ◽  
Saturated Hydrocarbons ◽  
Methylene Groups ◽  
Infrared Absorption Spectra

Determination of the composition of an ethylene-α-butylene copolymer from its infrared absorption spectra

1967 ◽  
Vol 9 (2) ◽  
pp. 503-505 ◽  
Author(s):  
V.L. Khodzhayeva ◽  
V.M. Mamedova
Keyword(s):  
Absorption Spectra ◽  
Infrared Absorption ◽  
Infrared Absorption Spectra

ANALYSIS OF THE COMPOSITION OF WATER-ALCOHOL MIXTURES USING THE INFRARED ABSORPTION SPECTRA OF THEIR VAPORS

2021 ◽  
Vol 88 (6) ◽  
pp. 933-941
Author(s):  
V. L. Vesnin
Keyword(s):  
Linear Regression ◽  
Multiple Linear Regression ◽  
Absorption Spectra ◽  
Infrared Absorption ◽  
Liquid Mixture ◽  
The Mean ◽  
Alcohol Mixtures ◽  
Infrared Absorption Spectra ◽  
Water Alcohol

The article presents the results of studies of infrared absorption spectra of saturated vapors of alcohols and alcohol-containing mixtures in the range of 1.3—1.5 μm. A method was developed for the quantitative determination of the composition of water-alcohol mixtures based on the use of multiple linear regression, and a range of methanol concentrations was determined, in which the nonlinearity of the dependence of the concentration of alcohols in saturated vapors over a liquid mixture on the concentration of alcohols in this liquid mixture does not significantly affect the results of analysis of the mixture composition. A method for optimizing a set of wavelengths for multiple linear regression, based on minimizing the mean-square error in determining the concentration is proposed and implemented. The developed methods make it possible to determine the presence of small (<1%) amounts of methanol against the background of large amounts of ethanol and water using relatively inexpensive and accessible spectroscopic equipment.

Determination of the crystallinity of polytetrafluoroethylene from infrared absorption spectra

1976 ◽  
Vol 24 (6) ◽  
pp. 732-734 ◽  
Author(s):  
I. S. Perelygin ◽  
M. Z. Peskova ◽  
Z. Z. Zakirov ◽  
I. M. Glinkin
Keyword(s):  
Absorption Spectra ◽  
Infrared Absorption ◽  
Infrared Absorption Spectra

Determination of the rigidity of polymer chains from the infrared absorption spectra of oriented elastomers

1973 ◽  
Vol 15 (7) ◽  
pp. 1746-1756
Author(s):  
K.V. Nel'son ◽  
A.P. Berezkina ◽  
Ye.Ye. Avstriiskaya
Keyword(s):  
Absorption Spectra ◽  
Infrared Absorption ◽  
Polymer Chains ◽  
Infrared Absorption Spectra

Determination of the refractive index of a-Si_1−xCx:H thin films from infrared absorption spectra

1993 ◽  
Vol 32 (7) ◽  
pp. 1173 ◽  
Author(s):  
S. Lugomer ◽  
A. Maksimović ◽  
D. Gracin
Keyword(s):  
Thin Films ◽  
Refractive Index ◽  
Absorption Spectra ◽  
Infrared Absorption ◽  
Infrared Absorption Spectra

THE INFRARED ABSORPTION SPECTRA OF DEUTERATED ESTERS: II. ETHYL ACETATE

1956 ◽  
Vol 34 (10) ◽  
pp. 1392-1404 ◽  
Author(s):  
B. Nolin ◽  
R. Norman Jones
Keyword(s):  
Absorption Spectrum ◽  
Ethyl Acetate ◽  
Absorption Spectra ◽  
Infrared Absorption ◽  
Infrared Absorption Spectrum ◽  
Absorption Characteristic ◽  
Stretching Vibration ◽  
Methylene Groups ◽  
Infrared Absorption Spectra ◽  
The Individual

The infrared absorption spectrum of ethyl acetate has been compared with the spectra of seven derivatives deuterated in the methyl and methylene groups. In the region 3500–1300 cm.−1 most of the bands can be assigned to vibrations localized in the individual groups. Absorption characteristic of the trideuteromethyl and dideuteromethylene groups can be recognized between 2300 and 2000 cm.−1. The C=O stretching vibration shows progressive displacement to lower frequency with increasing deuteration. The spectra in the range 1300–700 cm.−1 are also reported.

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