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Amphiphilic Block Copolymer from Hydroxyl‐Terminated Polymers Functionalized with TEMPO. A New Synthetic Method Using Oxoammonium Salt
Author(s) -
BonillaCruz José,
LaraCeniceros Tania E.,
RamírezWong D. G.,
SaldívarGuerra Enrique,
PérezRodríguez F.,
MárquezLamas Uriel
Publication year - 2011
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.201100070
Subject(s) - copolymer , surface modification , amphiphile , polymer chemistry , polymer , nitroxide mediated radical polymerization , end group , chemistry , bifunctional , chemical modification , salt (chemistry) , polymerization , radical polymerization , materials science , organic chemistry , catalysis
A simple approach for the end‐functionalization of hydroxyl‐terminated polymers with nitroxide moieties using oxoammonium salts (OS) is presented. The functionalization is carried out using only one synthetic pathway in which high levels of functionalization (90%) are found. A mechanism for the functionalization with TEMPO moieties using OS is proposed in which the formation of peroxide groups is suggested. The structures of the functionalized polymers are characterized in detail by 1 H NMR, 13 C NMR, DQF‐COSY, and HETCOR. Bifunctional macroalkoxyamines are used to demonstrate how to extend the polymer chain for the synthesis of amphiphilic triblock copolymers by polymerizing St in a second block mediated by a nitroxide radical which provides the block length control.