Synthesis of well-defined star polymers and star block copolymers from dendrimer initiators by atom transfer radical polymerization

Novel polyarylether dendrimers with 1,3,5-tri(4-hydroxyphenoxy)benzene core, polybenzylether interior, and benzyl 2-bromoisobutyrate surface group (CMG n-Br, n=1–3, with functionality of 6, 12, and 24, respectively) were prepared by convergent procedure. ATRP of tert-butyl acrylate ( tBA) and styren...

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Published in:Polymer (Guilford) 2005-07, Vol.46 (15), p.5808-5819
Main Authors: Zhao, Youliang, Chen, Yongming, Chen, Chuanfu, Xi, Fu
Format: Article
Language:English
Subjects:
Applied sciences
Atom transfer radical polymerization
Dendrimer
Exact sciences and technology
Organic polymers
Physicochemistry of polymers
Polymerization
Preparation, kinetics, thermodynamics, mechanism and catalysts
Star polymer
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cited_by cdi_FETCH-LOGICAL-c467t-1f8b76eabcf4b6531f05d6e2219fbfeb3d631ce413cd68a290b1263ec056de713
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creator Zhao, Youliang
Chen, Yongming
Chen, Chuanfu
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description Novel polyarylether dendrimers with 1,3,5-tri(4-hydroxyphenoxy)benzene core, polybenzylether interior, and benzyl 2-bromoisobutyrate surface group (CMG n-Br, n=1–3, with functionality of 6, 12, and 24, respectively) were prepared by convergent procedure. ATRP of tert-butyl acrylate ( tBA) and styrene (St) with CMG n-Br dendrimer initiators in the presence of CuBr/pentamethyldiethylenetriamine catalytic system was investigated in detail, and a series of well-defined dendrimer-like star P tBA and PSt with precise arm numbers were synthesized under suitable conditions. The quantitative initiation of the dendrimer initiators was demonstrated by high initiation efficiency, 1H NMR spectra, hydrolysis, and MALLS/SEC approach. Star block copolymers comprising PSt and P tBA segments with low polydispersity (1.08< M w/ M n
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ATRP of tert-butyl acrylate ( tBA) and styrene (St) with CMG n-Br dendrimer initiators in the presence of CuBr/pentamethyldiethylenetriamine catalytic system was investigated in detail, and a series of well-defined dendrimer-like star P tBA and PSt with precise arm numbers were synthesized under suitable conditions. The quantitative initiation of the dendrimer initiators was demonstrated by high initiation efficiency, 1H NMR spectra, hydrolysis, and MALLS/SEC approach. Star block copolymers comprising PSt and P tBA segments with low polydispersity (1.08&lt; M w/ M n&lt;1.18) were also successfully synthesized using functional macroinitiators by block copolymerization. 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subjects Applied sciences
Atom transfer radical polymerization
Dendrimer
Exact sciences and technology
Organic polymers
Physicochemistry of polymers
Polymerization
Preparation, kinetics, thermodynamics, mechanism and catalysts
Star polymer
title Synthesis of well-defined star polymers and star block copolymers from dendrimer initiators by atom transfer radical polymerization
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