Influence of the Molecular Characteristics of Epoxy Oligomers and their Blends on their Rheological Properties

Abstract

An investigation was made of the influence of the molecular characteristics of industrial bisphenol-A epoxy oligomers of grades DER-330, ED-20, ED-16, and ED-8, and the molecular characteristics of their blends, on their rheological properties. It was shown that the viscosity of the oligomers and their blends is connected with the content of low-molecular-weight fraction. A procedure is proposed that makes it possible, by changing the fractional composition, to produce a blend of epoxy oligomers with a given viscosity.

The Rheological Properties of a Viscous Epoxy Oligomer

“…Similar dependences were obtained for mixtures of epoxy bisphenol A oligomers with different molecular weights and MWDs [7].…”

The Influence of Modification on the Properties of Epoxy Anhydride Binder and Microplastic Based on It

“…A positive effect from modification of the binder was realised in microplastic on basalt roving.Binders based on epoxy oligomers, owing to their valuable combination of processing and service properties, have been widely used in the production of polymer composites. The compositions of the epoxy binders are constantly being improved for the purpose of increasing their elastic strength characteristics and heat, fire, and cracking resistance, reducing their water absorption, and so on.The properties of epoxy oligomers are chiefly influenced by their molecular weight [1]. A high molecular weight of the oligomer leads to a reduction in the gelation time and shrinkage during curing, and to an increase in the physicomechanical properties, but in this case its viscosity increases.…”

“…The properties of epoxy oligomers are chiefly influenced by their molecular weight [1]. A high molecular weight of the oligomer leads to a reduction in the gelation time and shrinkage during curing, and to an increase in the physicomechanical properties, but in this case its viscosity increases.…”