ABC‐type hetero‐arm star terpolymers through “Click” chemistry

Abstract

Hetero‐arm star ABC‐type terpolymers, poly(methyl methacrylate)‐polystyrene‐poly(tert‐butyl acrylate) (PMMA‐PS‐PtBA) and PMMA‐PS‐poly(ethylene glycol) (PEG), were prepared by using “Click” chemistry strategy. For this, first, PMMA‐b‐PS with alkyne functional group at the junction point was obtained from successive atom transfer radical polymerization (ATRP) and nitroxide‐mediated radical polymerization (NMP) routes. Furthermore, PtBA obtained from ATRP of tBA and commercially available monohydroxyl PEG were efficiently converted to the azide end‐functionalized polymers. As a second step, the alkyne and azide functional polymers were reacted to give the hetero‐arm star polymers in the presence of CuBr/N,N,N′,N″,N″‐pentamethyldiethylenetriamine (PMDETA) in DMF at room temperature for 24 h. The hetero‐arm star polymers were characterized by 1H NMR, GPC, and DSC. © 2006 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 44: 5699–5707, 2006

Synthesis of amphiphilic and thermoresponsive ABC miktoarm star terpolymer via a combination of consecutive click reactions and atom transfer radical polymerization

“…This phenomenon was also observed in previous works reported by other research groups. 16,22 From 1 H NMR of 7 [ Fig. 5(c)], we can discern all characteristic signals of PEG, PNIPAM, and PtBMA blocks, and the peak integral ratios between these peaks agreed quite well with the relative segment lengths between these three arms.…”

“…[15][16][17][18][19] In the last few years, click reaction has been introduced into the synthesis of novel polymeric materials. [20][21][22][23][24][25][26][27][28][29][30] Tunca and coworkers 22 reported a few excellent works concerning the preparation of ABC miktoarm star terpolymers via a combination of ATRP, NMP, ROP, and click reaction. The introduction of click technique allows the covalent linkage of a well-defined precursor arm into the star terpolymer.…”

“…Tunca and coworkers 22 reported the synthesis of ABC miktoarm terpolymer by using click reaction. The click reaction of azido group located at the junction of AB diblock with monoalkynyl-terminated polymer led to the formation of ABC miktoarm star terpolymer.…”

Synthesis of an ABCD 4-Miktoarm Star Quaterpolymer Through a Diels–Alder Click Reaction

“…The click chemistry using Cu(I)-catalyzed Huisgen and Diels-Alder reactions for the preparation of polymers with different composition and topology, ranging from linear (telechelic [29,30], macromonomer [31,32] and block co-polymer [33][34][35][36][37][38][39][40]), to non-linear macromolecular structures (graft [41][42][43][44][45][46][47][48][49][50], star [51][52][53][54], miktoarm star [55][56][57][58][59], H-type [60,61], dendrimer [62][63][64][65][66][67], dendronized linear polymer [68], macrocyclic polymer [69] and network system [70][71][72]) has been receiving increasing interest nowadays due to its described advantages previously.…”

Photoinduced grafting of polystyrene onto silica particles by ketene chemistry

“…[22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38] The copper-catalyzed click reactions, Diels-Alder reactions, and thiol-ene reactions are such click reactions with very high yields and nearly no by-product formation. Recently, the ketene chemistry is also announced as a promising route for the modification of macromolecular structures with significant yields.…”