TY - JOUR
T1 - Dendrimer-Like Miktoarm Star Terpolymers
T2 - A3-(B-C)3 via Click Reaction Strategy
AU - Altintas, Ozcan
AU - Demirel, A. Levent
AU - Hizal, Gurkan
AU - Tunca, Umit
PY - 2008/9/1
Y1 - 2008/9/1
N2 - Two samples of dendrimer-like miktoarm star terpolymers: (poly(teributyl acrylate))3-(polystyrene-poly(ε-caprolactone))3 (PtBA)3-(PS-PCL)3, and (PS)3-(PtBA- poly(ethylene glycol)3 were prepared using efficient Cu catalyzed Huisgen cycloaddition (click reaction). As a first step, azido-terminated 3-arm star polymers PtBA and PS as core (A) were synthesized by atom transfer radical polymerization (ATRP) of tBA and St, respectively, followed by the conversion of bromide end group to azide. Secondly, PS-PCL and PtBA-PEG block copolymers with alkyne group at the junction as peripheral arms (B-C) were obtained via multiple living polymerization mechanisms such as nitroxide mediated radical polymerization (NMP) of St, ring opening polymerization (ROP) of ε-CL, ATRP of tBA. Thus obtained core and peripheral arms were linked via click reaction to give target (A)3-(B-C)3 dendrimer-like miktoarm star terpolymers. (PtBA)3-(PS-PCL)3 and (PS) 3-(PEG-PtBA)3 have been characterized by GPC, DSC, AFM, and SAXS measurements. (PtBA)3-(PS-PCL)3 did not show any self-organization with annealing due to the miscibility of the peripheral arm segments. In contrast, the micro-phase separation of the peripheral arm segments in (PS)3-(PtBA-PEG)3 resulted in self-organized phase-separated morphology with a long period of ∼13 nm.
AB - Two samples of dendrimer-like miktoarm star terpolymers: (poly(teributyl acrylate))3-(polystyrene-poly(ε-caprolactone))3 (PtBA)3-(PS-PCL)3, and (PS)3-(PtBA- poly(ethylene glycol)3 were prepared using efficient Cu catalyzed Huisgen cycloaddition (click reaction). As a first step, azido-terminated 3-arm star polymers PtBA and PS as core (A) were synthesized by atom transfer radical polymerization (ATRP) of tBA and St, respectively, followed by the conversion of bromide end group to azide. Secondly, PS-PCL and PtBA-PEG block copolymers with alkyne group at the junction as peripheral arms (B-C) were obtained via multiple living polymerization mechanisms such as nitroxide mediated radical polymerization (NMP) of St, ring opening polymerization (ROP) of ε-CL, ATRP of tBA. Thus obtained core and peripheral arms were linked via click reaction to give target (A)3-(B-C)3 dendrimer-like miktoarm star terpolymers. (PtBA)3-(PS-PCL)3 and (PS) 3-(PEG-PtBA)3 have been characterized by GPC, DSC, AFM, and SAXS measurements. (PtBA)3-(PS-PCL)3 did not show any self-organization with annealing due to the miscibility of the peripheral arm segments. In contrast, the micro-phase separation of the peripheral arm segments in (PS)3-(PtBA-PEG)3 resulted in self-organized phase-separated morphology with a long period of ∼13 nm.
KW - Atom transfer radical polymerization
KW - Atomic force microscopy
KW - Click reaction
KW - Dendrimer-like star polymer
KW - Gel permeation chromatography
KW - Miktoarm star polymer
KW - Nitroxide mediated radical polymerization
KW - Ring-opening polymerization
UR - http://www.scopus.com/inward/record.url?scp=50649085522&partnerID=8YFLogxK
U2 - 10.1002/pola.22908
DO - 10.1002/pola.22908
M3 - Article
AN - SCOPUS:50649085522
SN - 0887-624X
VL - 46
SP - 5916
EP - 5928
JO - Journal of Polymer Science, Part A: Polymer Chemistry
JF - Journal of Polymer Science, Part A: Polymer Chemistry
IS - 17
ER -