A method for the determination and quantification of higher-functional epoxides in liquid diglycidylether of bisphenol-A (DGEBA)-based epoxy resins, and for the determination and quantification of the amount of branching in solid DGEBA-based epoxy resins by 13C n.m.r. is described. Model compounds were synthesised and their chemical shifts assigned. Examples for both types of resin are given, and the usefulness of the method is shown by the example of a production campaign of a solid resin. The increase of branching and the build up of molecular weight are compared and discussed.
Посилання на статтю:
Branching in epoxy resins-analytical aspects / U. Fuchslueger, H. Stephan, H.-J. Grether, M. Grasserbauer // Polymer. – 1999. – N 40. – P. 661–673.