ROMP‐NMP‐ATRP combination for the preparation of 3‐miktoarm star terpolymer via click chemistry

Abstract

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

Intramolecular Cross-linking of Polymers Using Difunctional Acetylenes via Click Chemistry

“…The Diels-Alder cycloaddition reac-tion [24][25][26] and thiol-ene chemistry [27,28] have recently been introduced as alternative click routes for providing new materials. Click reactions have been widely used for the synthesis of polymers with different compositions and topologies, ranging from linear (telechelic [29], macromonomer [30,31], macrophotoinitiator [32,33] and block co-polymer [34][35][36]) to nonlinear macromolecular structures (graft [37][38][39], star [40,41], miktoarm star [42,43], H-type [44], dendrimer [45][46][47], dendronized linear polymers [48,49], macrocyclic polymers [50,51], self-curable polymers [52][53][54], network systems [55,56] and polymeric nanoparticles [14,57]). Recently, the development and application of click chemistry in polymer and material science has been extensively reviewed [58][59][60][61][62][63].…”

Thermally Curable Polyoxanorbornene by Ring Opening Metathesis Polymerization

“…Absolute molecular weights of PONB-Bz polymers were measured by using TD-SEC in THF at 35 8C, after introducing an experimental dn/dc ¼ 0.157 mL Á g À1 into the software. [60][61][62][63] This experimental dn/dc was determined from a slope of RI area vs. concentration (g Á mL À1 ) linear plot containing at least four different polymer concentrations and based on an assumption that truly size-exclusion mechanism was operative in the columns of TD-SEC ( Table 1). The obtained M n; TD-SEC values were close to the theoretical numberaverage molecular weights.…”

Polyelectrolyte Stars and Cylindrical Brushes

“…For the growth of the arms, mostly controlled radical polymerizations were used. There are only very rare cases of stars made from nitroxide-mediated radical polymerization (NMRP) [70] or reversible additionfragmentation chain transfer (RAFT) techniques [71,72]. In the RAFT technique one has to differentiate between approaches where the chain transfer agent is attached by its R-or Z-function.…”