Combining two live polymerization processes led to the successful creation of poly(n-butyl acrylate)-graft-branched polyethylene. First, a live olefin polymerization with Pd was used to create a branching polyethylene macromonomer with a functionalized end group for methacrylates.
After that, atom transfer radical polymerization was used to copolymerize the macromonomer with n-butyl acrylate. The graft copolymers' gel permeation chromatography traces revealed limited molecular weight distributions suggestive of a regulated process. The reactivity ratios of the macromonomer to n-butyl acrylate were comparable to those for methyl methacrylate to n-butyl acrylate at low macromonomer concentrations corresponding to low viscosities.
The apparent reactivity ratio of the macromonomer to n-butyl acrylate decreased due to the reaction solution's increased viscosity as a result of higher macromonomer concentrations, showing an incompatibility between nonpolar polyethylene segments and a polar substance.
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