Natural Radiation of Aqueous Solutions of Strong Acids in the Millimeter Region of the Spectrum

2021 ◽  
Vol 95 (8) ◽  
pp. 1601-1605
Author(s):  
A. K. Lyashchenko ◽  
I. M. Karataeva ◽  
V. S. Dunyashev ◽  
A. Yu. Efimov
Keyword(s):  
Aqueous Solutions ◽  
Natural Radiation ◽  
Strong Acids

SYNTHESIS OF N-SUBSTITUTED DIISOPROPANOLAMINES, THEIR SEBACATE POLYESTERS AND POLYURETHANE ELASTOMERS

1958 ◽  
Vol 36 (10) ◽  
pp. 1405-1409 ◽  
Author(s):  
Jean L. Boivin
Keyword(s):  
Aqueous Solutions ◽  
Infrared Absorption ◽  
Propylene Oxide ◽  
Sebacic Acid ◽  
Ionization Constants ◽  
Polyurethane Elastomers ◽  
Molecular Weights ◽  
Slight Excess ◽  
Infrared Absorption Spectra ◽  
Strong Acids

Several N-substituted diisopropanolamines were prepared by reacting aqueous solutions of amines with excess propylene oxide at ordinary pressure but higher N-substituted diisopropanolamines had to be prepared in an autoclave at 200 °C. The ionization constants of these bases were measured and recorded as pKa values. Their infrared absorption spectra gave bands common to all diisopropanolamines mainly at 3.04, 7.14, 7.55, 7.85, 9.45, 10.6, and 11.95 microns. Their condensation with sebacic acid gave the corresponding polyesters, which were soluble in strong acids and had molecular weights of about 1500. The hydroxyl-terminated polyesters were cured with a slight excess of 2,4-tolylene diisocyanate at 100 °C for 2 days to yield elastomers of brittle temperatures in the region of −50 °C.

Medium effects on tetraalkylammonium ions in aqueous acid solutions

1976 ◽  
Vol 54 (9) ◽  
pp. 1439-1444 ◽  
Author(s):  
Tomasz A. Modro ◽  
William F. Reynolds ◽  
Keith Yates
Keyword(s):  
Aqueous Solutions ◽  
Chemical Shifts ◽  
Ionic Species ◽  
Acid Solutions ◽  
Medium Effects ◽  
Tetraalkylammonium Ions ◽  
Aqueous Acid ◽  
Low Field ◽  
Cation Hydration ◽  
Strong Acids

Medium effects upon 1H and 13C chemical shifts have been determined for some tetraalkylammonium ions in 0–10 M aqueous solutions of H2SO4, HClO4, and H3PO4. The observed effects are very weak in magnitude, thus justifying the choice of tetraalkylammonium ions as reference standards for studies of ionic species in aqueous solutions of strong acids. The trends in the observed low-field shifts are interpreted in terms of changes in cation hydration and in hydrogen bonding between alkyl hydrogens and acid anions.

scholarly journals Studying the kinetics of salicin hydrolysis in an acidic environment

2020 ◽  
Author(s):  
A. B. Sabutova
Keyword(s):  
Aqueous Solutions ◽  
Hplc Method ◽  
Acidic Environment ◽  
Strong Acids ◽  
Kinetics Of ◽  
Hydrolysis Of

The work is devoted to the study of the kinetics of the hydrolysis of salicin in aqueous solutions. To determine salicin in the objects of study, the HPLC method was used. During the study, it was found that the hydrolysis of salicin occurs only in aqueous solutions of strong acids.

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