ND Energy | July 30, 2015
A new paper by a team of researchers that includes Haifeng Gao, an assistant professor of chemistry and biochemistry at the University of Notre Dame, presents, for the first time, a one-pot, one-batch synthesis of hyperbranched polymers with tunablemolecular weights, uniform size and high degree of branching using an efficient click polymerization technique.
Hyperbranched polymers with tree-like nanostructures and multiple chain-end functionalities represent an important type of soft nanomaterials that can be used in a variety of applications, ranging from specialty additives, nanomedicines and catalysis.
“However, robust synthetic methods that can easily control the polymer structures, molecular weights and uniformity have not been reported,“ Gao said. Specifically, the copper-catalyzed azide-alkyne cycloaddition polymerization of an AB2 trifunctional monomer demonstrates a desirable ‘living’ chain-growth mechanism with increased molecular weight versus conversion and clean chain extension in repeated monomer additions. In addition, the reaction of monomer in polymerization showed accelerated reaction of the two B groups, producing hyperbranched polymers with high degree of branching (DB) = 0.83.”
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