Star-shaped polyphosphoesters with reactive end groups synthesized via acyclic diene metathesis polymerization and their transformation to nanostructures
Abstract
Four-arm star shaped polyphosphoesters are synthesized via acyclic diene metathesis (ADMET) polymerization. This is accomplished by utilizing a phosphoester functional asymmetric α,ω-diene containing a terminal double bond and an acrylate, which is polymerized in the presence of a phosphate compound with multifunctional terminal acrylates as selective and irreversible chain transfer agents using a Hoveyda–Grubbs second generation catalyst. High cross-metathesis selectivities are achieved at low temperatures enabling good control over molecular weights. These reactive star polymers were readily converted, by thiol-Michael addition click reaction of the end groups in dilute solution, to novel thiol-functionalized polymers. Subsequently, hybrid nanostructures are successfully fabricated through covalent integration of Au nanoparticles with this new type of polyphosphoester, which is shown to be one interesting application of such functionalized metathesis polymers.
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