In organic chemistry, amine value is a measure of the nitrogen content of an organic molecule. Specifically, it is usually used to measure the amine content of amine functional compounds.Howarth, GA. Master of Science thesis "The synthesis of a legislation compliant corrosion protection paint system, based on waterborne epoxy, urethane and oxazolidine technology". April 1997 Imperial College London Chapter 1.9.5 page 29 It may be defined as the number of milligrams of potassium hydroxide (KOH) needed to neutralize all amine groups in 1g sample
List of ASTM methods There are a number of ASTM analytical test methods to determine amine value. A number of states in the United States have adopted their own test methods but they are based on ASTM methods. Although there are similarities with the method it is not the same as an acid value. ASTM D2073 - This is a potentiometric method. ASTM D2074-07 ASTM D2896 - potentiometric method with perchloric acid. ASTM D6979-03
First principles
The amine value is useful in helping determine the correct stoichiometry of a two component amine cure epoxy resin system.Howarth, GA. Master of Science thesis "The synthesis of a legislation compliant corrosion protection paint system, based on waterborne epoxy, urethane and oxazolidine technology". April 1997 Imperial College London Chapter 3.2.3 Amine stoichiometry page 56
It is the number of Nitrogens x 56.1 (Mwt of KOH) x 1000 (convert to milligrams) divided by molecular mass of the amine functional compound. So using Tetraethylenepentamine (TEPA) as an example: Mwt = 189, number of nitrogen atoms = 5
So 5 x 1000 x 56.1/189 = 1484. So the Amine Value of TEPA = 1484
Other amines All numbers are in units of mg KOH/g. Ethylenediamine. Amine value = 1870 Diethylenetriamine. Amine value = 1634 Triethylenetetramine. Amine value = 1537 Aminoethylpiperazine. Amine value = 1305 Isophorone diamine. Amine value = 660 Hexamethylenediamine. Amine value = 967 1,2-Diaminocyclohexane. Amine value = 984 1,3-BAC. Amine value = 790 2-Methylpentamethylenediamine -Dytek A. Amine value = 967 m-Xylylenediamine -MXDA. Amine value = 825
See also-related test methods Acid value Bromine number Epoxy value Hydroxyl value Iodine value Peroxide value Saponification value
References
Further reading
External links The chemistry of epoxide Synthesis of amines