A combination of ring opening metathesis polymerization (ROMP) and click chemistry approach is first time utilized in the preparation of 3‐miktoarm star terpolymer. The bromide end‐functionality of monotelechelic poly(N‐butyl oxanorbornene imide) (PNBONI‐Br) is first transformed to azide and then reacted with polystyrene‐b‐poly(methyl methacrylate) copolymer with alkyne at the junction point (PS‐b‐PMMA‐alkyne) via click chemistry strategy, producing PS‐PMMA‐PNBONI 3‐miktoarm star terpolymer. PNBONI‐Br was prepared by ROMP of N‐butyl oxanorbornene imide (NBONI) 1 in the presence of (Z)‐but‐2‐ene‐1,4‐diyl bis(2‐bromopropanoate) 2 as terminating agent. PS‐b‐PMMA‐alkyne copolymer was prepared successively via nitroxide‐mediated radical polymerization (NMP) of St and atom transfer radical polymerization (ATRP) of MMA. © 2008 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 47: 497–504, 2009

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Anthracene-functionalized oxanorbornene monomer and oxanorbornenyl polystyrene (PS) with x-anthracene endfunctionalized macromonomer were first polymerized via ringopening metathesis polymerization using the first-generation Grubbs' catalyst in dichloromethane at room temperature and then clicked with maleimide end-functionalized polymers, poly(ethylene glycol) (PEG)-MI, poly(methyl methacrylate) (PMMA)-MI, and poly(tert-butyl acrylate) (PtBA)-MI in a Diels-Alder reaction in toluene at 120 C to create corresponding graft copolymers, poly(oxanorbornene)-g-PEG, poly(oxanorbornene)-g-PMMA, and graft block copolymers, poly(oxanorbornene)-g-(PS-b-PEG), poly(oxanorbornene)-g-(PS-b-PMMA), and poly(oxanorbornene)-g-(PS-b-PtBA), respectively. Diels-Alder click reaction efficiency for graft copolymerization was monitored by UV-vis spectroscopy. The dn/dc values of graft copolymers and graft block copolymers were experimentally obtained using a triple detection gel permeation chromatography and subsequently introduced to the software so as to give molecular weights, intrinsic viscosity ([g]) and hydrodynamic radius (R h ) values. V C 2010 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 48: 5982-5991, 2010

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A 2,2,6,6‐tetramethylpiperidine‐1‐oxyl (TEMPO)‐terminated poly(ethylene glycol) (PEG) or ‐poly(ε‐caprolactone) (PCL) (PEG11‐TEMPO or PCL23‐TEMPO) is grafted as a side chain onto a ROMP‐generated polyoxanorbornene (PONB) main backbone with bromide pendant groups (PONB20‐Br) using the NRC click reaction to yield related the brush copolymers, PONB20‐g‐PEG11 or PONB20‐g‐PCL23 catalyzed by Cu(I), Cu(0), and N,N,N′,N″,N″‐pentamethyldiethylenetriamine in N,N‐dimethylformamide at room temperature. Additionally, a ROMP‐generated brush copolymer PONB9‐g‐poly(methyl methacrylate)24 (PMMA)24‐Cl was reacted with a PEG11‐TEMPO or a PCL23‐TEMPO precursor via the NRC click reaction to yield a corresponding brush terpolymer, PONB9‐g‐(PMMA24‐b‐PEG11) or PONB9‐g‐(PMMA24‐b‐PCL23) under a similar reaction condition described above. © 2011 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2011