Amine-equivalent weight

Demand for amine (neutralization capacity) is determined by C02 loading and amine equivalent weight. Polyfunctional amines appear to have a large equivalent weight advantage, but in practice they often have very low volatility and poor thermal stability. 

Amine-epoxy resin systems, 10 443 Amine equivalent weight (AEW), 10 399 Amine ethoxylates, 24 150-151 Amine extractants, 10 791 Amine functional curing agents,... 

The polyamidoamines are very high-viscosity liquids, some having viscosities over 50,000 mPa/sec. Typical amine equivalent weights are 100-150. The polyamidoamines react with bisphenol A epoxy resins at room temperature although the adhesives usually require several hours to reach sufficient molecular weight to carry a load. Cure times can be shortened to a few minutes at about 150°C. 

Adhesive B. Bulk materials and adhesive film were made with a blend of diglycidyl ether of bisphenol A (DGEBA) epoxy resin in a solid form (epoxy equivalent weight 530), 25 parts, and liquid form (epoxy equivalent weight 190), 75 parts, and were cured with 4,4 -diaminodiphenyl sulfone (DDS, amine equivalent weight 64), 28 parts, and toughened with the core-shell polymers, 0 or 15 parts (Table II). 

A plot of Mg vs T403 concentration, determined from the cure reactions and epoxide and amine equivalent weights, is illustrated in Figure 3 as the full line. The experimental data points in this figure were from Nielsen s ( ) empirical equation... 

One possible adhesive formulation contains 20 pbw (parts by weight) of epoxy resin, 70 pbw of filler, and 10 pbw of a reactive diluent and an aromatic amine curing agent such as diamino diphenylsulfone (DADS) whose amine-equivalent weight is 62. If the resin is Epon 825 or DER 332, having an epoxy equivalent of 174, the modified EEW will be ... 

Registered Tradename Common Name TSCA Number Equivalent Weight Primary plus 1 Secondary Amine, Equivalent Weight Appearance Cri25 C... 

As indicated above, reaction times were not optimized. Rate information was obtained, however, in one instance with Jeffamine D-2000 ( c) Compound 3c was selected because the viscosity of the reaction increased only slightly over the course of reaction and was, therefore, easily stirred. Furthermore, 3c possessed a fairly high amine equivalent weight and the exothermicity of the reaction caused only a slight increase in reaction temperature, i.e.,... 

EW ratio Ratio between the amine equivalent weight of hydrogen and the isocyanate EXAFS Extended X-ray absorption fine structure, i.e., the fine stmcture present in the X-ray absorption spectra beymid the absorption edge... 

The stoichiometric quantity of polyamine used to cure an epoxy resin is a fimction of the molecular weight and the number of active hydrogens of the polyamine (amine equivalent weight, AEW) and the EEW or equivalent weight of epoxy resin it is expressed as follows ... 

Amine Equivalent Weight n Molecular weight of amine divided by the number of active hydrogens in the molecule. 

More flexible, tougher products can be obtained by using liquid diamines or polyamines having more flexible backbones. For example, Jeflamine T.403 (Texaco Chemical) is a low-viscosity liquid (70 mPa s) having a molecular weight of about 440 and an amine equivalent weight of about 145. It is a poly-(propylene oxide) triamine made from the polyether initiated by trimethylol propane, and is promoted as a flexible cross-linker for epoxy systems. 

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