Reaction of Deuterio Polyisoprene and Deuterio Polybutadiene with Sulfur

1963 ◽  
Vol 36 (1) ◽  
pp. 219-235
Author(s):  
J. J. Shipman ◽  
M. A. Golub
Keyword(s):  
Absorption Band ◽  
Infrared Spectrum ◽  
Natural Rubber ◽  
Absorption Spectroscopy ◽  
Infrared Absorption ◽  
Crosslinking Reaction ◽  
Infrared Absorption Spectroscopy ◽  
Chemical Changes ◽  
The Past ◽  
Soft Rubber

Abstract Infrared absorption spectroscopy has been employed in the past in efforts to determine the nature of the chemical changes which occur in natural rubber during vulcanization. The most prominent change in the infrared spectrum of rubber accompanying vulcanization with sulfur is the appearance of a new absorption band at 10.4 µ. In the spectra of useful soft rubber vulcanizates this band is barely detectable, while in those of hard rubber (ebonite) it is moderately intense. It has not been known whether this band is related in some way to the actual crosslinking reaction or is the result of some noncrosslinking reaction between the rubber and sulfur molecules.

Determination of Carbon Monoxide and Carbon Dioxide Concentrations at Temperatures between 295 and 1250 K Using Fourier Transform Infrared Absorption Spectroscopy

1992 ◽  
Vol 46 (12) ◽  
pp. 1887-1894 ◽  
Author(s):  
Patrick J. Medvecz ◽  
Kenneth M. Nichols
Keyword(s):  
Fourier Transform ◽  
High Temperature ◽  
Absorption Band ◽  
Absorption Spectra ◽  
Absorption Spectroscopy ◽  
Infrared Absorption ◽  
Infrared Absorption Spectroscopy ◽  
Gas Cell ◽  
Fundamental Absorption Band

Fourier transform infrared absorption spectroscopy has been used for the determination of CO and CO2 gas concentrations in a high-temperature cell. The gas mixtures analyzed consisted of CO, CO2, and nitrogen; among the samples, the concentration of CO was varied between 0.5 and 4.7% and the CO2 ranged between 0.7 and 4.9%. The temperature of the gas cell was varied between 295 and 1250 K, while the pressure was maintained at atmospheric. Throughout this temperature range, 123 absorption spectra were recorded in the gas cell at a nominal instrument resolution of 0.25 cm−1. The absorption lines used for the concentration analysis consisted of 22 P-branch CO vibrational-rotational lines from the fundamental absorption band, and 19 R-branch CO2 vibrational-rotational lines from the v3 fundamental absorption band. All of the peak heights used for the concentration calculations were first numerically corrected for photometric errors resulting from the finite resolution of the FT-IR instrument. The corrected peak heights were assumed to follow the Bouguer-Lambert law at a constant furnace temperature. Fifty-one of the spectra were used to determine the temperature dependence of the line strength for each of the 41 lines. The experimentally obtained line strengths were then used to determine the gas concentrations of all 123 spectra. The calculated concentrations were compared to NDIR instrument measurements of the gas composition exiting the flow-through high-temperature gas cell. Comparison of the NDIR measured gas concentrations with the calculated concentrations from absorption spectra yielded an average accuracy of 3.6% for the CO spectra and 4.9% for the CO2 spectra.

High Resolution Infrared Absorption Spectroscopy of C60 Molecules and Clusters in Parahydrogen Solids

1999 ◽  
Author(s):  
Simon Tam ◽  
Michelle E. DeRose ◽  
Mario E. Fajardo ◽  
Norihito Sogoshi ◽  
Yoshiyasu Kato
Keyword(s):  
High Resolution ◽  
Absorption Spectroscopy ◽  
Infrared Absorption ◽  
Infrared Absorption Spectroscopy

scholarly journals Author Correction: Absolute 13C/12C isotope amount ratio for Vienna PeeDee Belemnite from infrared absorption spectroscopy

2021 ◽  
Author(s):  
Adam J. Fleisher ◽  
Hongming Yi ◽  
Abneesh Srivastava ◽  
Oleg L. Polyansky ◽  
Nikolai F. Zobov ◽  
...  
Keyword(s):  
Absorption Spectroscopy ◽  
Infrared Absorption ◽  
Infrared Absorption Spectroscopy ◽  
Isotope Amount Ratio
Sign in / Sign up

Export Citation Format

Share Document