Synthesis of Well-Defined ω-Oxanorbornenyl Poly(ethylene oxide) Macromonomers via Click Chemistry and Their Ring-Opening Metathesis Polymerization

omega-Oxanorbornenyl poly(ethylene oxide) monomethyl ether macromonomers were synthesized with molecular weights ranging from 500 g/mol to 5000 g/mol through the Hursgen 1.3-dipolar cycloaddition between acetylene-functionalized oxanorbornene and omega-azulo poly(ethylene oxide) monomethyl ether The mid analysis showed that the omega-evo-notbornenyl end-group of the macromonomers is converted into a malennide group thr ough a retio-Diels Alder process at 130 degrees C Ring-opening metathesis polymerization (ROMP) of these macromonomers was investigated using Grubbs' catalyst in dichlorometk ne at room temperature Poly(oxanorbornene)-g-poly(ethylene oxide)s were obtained with polychsper sit es between 1 04 and 1 17 and molecular weights between 9900 and 57 800 g/mol leading to comb or brush copolymers according to the lengths of backbone and graft chains