title: Branched Polymers via ROMP of Termimers.
abstract: Today's olefin metathesis catalysts show high reactivity, selectivity, and functional group tolerance and allow the design of new syntheses of precisely functionalized polymers. Here the synthesis of a new end-capping reagent is investigated allowing the introduction of a highly reactive activated ester end-group at the polymer chain end as well as its prefunctionalization to directly introduce functional moieties. The versatility of this new end-capping reagent is demonstrated by utilizing it to synthesize a so-called termimer (a monomer with termination capabilities). Copolymerization of a norbornene derivative with the termimer leads to hyperbranched ring-opening metathesis polymerization polymers as proven by gel permeation chromatography and MALDI-ToF-(matrix-assisted laser desorption/ionization time of flight) mass spectrometry.
authors.affiliation: Departement für Chemie, Universität Freiburg, CH-1700, Freiburg, Switzerland.
authors.forename: Nils
authors.initials: N
authors.lastname: Hanik
authors.affiliation: Departement für Chemie, Universität Freiburg, CH-1700, Freiburg, Switzerland.
authors.forename: Andreas F M
authors.initials: AF
authors.lastname: Kilbinger
mesh_terms: D000475:Alkenes / Q000737:chemistry*; D002850:Chromatography, Gel; D009636:Norbornanes / Q000737:chemistry*; D058105:Polymerization; D019032:Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization
chemical_list: D000475:Alkenes; D009636:Norbornanes
keywords: Grubbs catalysts; functional termination; hyperbranched polymers; ring opening metathesis polymerization