Activity coefficients and ionization constants of certain nitroacetanilides and nitroanilines in aqueous solutions of potassium hydroxide

1970 ◽  
Vol 19 (2) ◽  
pp. 251-255
Author(s):  
A. Kh. Pochikyan ◽  
M. I. Vinnik
Keyword(s):  
Aqueous Solutions ◽  
Activity Coefficients ◽  
Potassium Hydroxide ◽  
Ionization Constants

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.

Activity coefficients of hexaamminecobalt(III) oxalate and hexacyanoferrate(III) in aqueous solutions of higher valent electrolytes at 25�C

1989 ◽  
Vol 18 (4) ◽  
pp. 379-386 ◽  
Author(s):  
Jesus M. Arsuaga ◽  
Mercedes C�ceres-Alonso ◽  
Miguel A. Castellanos ◽  
Javier Nu�ez
Keyword(s):  
Aqueous Solutions ◽  
Activity Coefficients
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