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.
An investigation was made of tube grades of high-density polyethylene with a unimodal and a bimodal molecular weight distribution during shear and longitudinal deformation under constant force conditions. It was shown that these polymers have similar melt flow indices and flow curves but differ considerably in other characteristics during shear deformation and in their behaviour during longitudinal deformation.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.