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.
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