Journal
MACROMOLECULAR RAPID COMMUNICATIONS
Volume 34, Issue 17, Pages 1381-1386Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/marc.201300472
Keywords
ADMET; block copolymers; Heck coupling; polymer-polymer conjugation; star-shaped polymer
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Three- and four-arm star shaped polymers, as well as diblock copolymers,are synthesized via acyclic diene metathesis (ADMET) polymerization. Thisis accomplished byusing an asymmetric ,-diene containing a terminal double bond and an acrylate, whichis polymerized in the presence of multifunctional acrylates as selective and irreversible chain transfer agents using Hoveyda-Grubbs second generation catalyst. High cross-metathesis selectivitiesare achieved at low temperatures enabling good control over molecular weights. Furthermore, additional polyethyleneglycol (PEG) blocksare attached to these polymersvia Heck coupling of the acrylate end-groups of these polymers with aryl iodide functionalized PEG, obtaining three- and four-arm star shaped di- and triblock copolymers with molecular weights up to 31 kDa.
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