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Synthesis of Telechelic Oligomers via Atom Transfer Radical Polymerization, 1

✍ Scribed by Belkacem Otazaghine; Ghislain David; Bernard Boutevin; Jean Jacques Robin; Kris Matyjaszewski

Publisher
John Wiley and Sons
Year
2004
Tongue
English
Weight
200 KB
Volume
205
Category
Article
ISSN
1022-1352

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✦ Synopsis

Abstract

Summary: Atom Transfer Radical Polymerization (ATRP) of styrene was carried out at 110 °C using various substituted 2‐bromoisobutyrates as initiators and the homogeneous catalyst CuBr/1,1,4,7,10,10‐hexamethyltriethylenetetramine (HMTETA). Telechelic oligomers were obtained by coupling the bromo terminated polymers using Cu(0)/PMDETA catalyst at 90 °C. The products were characterized by ^1^H NMR and MALDI‐TOF and some unsaturated polymer chains were observed. They could originate from either disproportionation reaction or dehydrohalogenation of halogen terminated oligomers during MALDI analysis. Using this method, polymers with hydroxy, acid, or ester end groups were synthesized in a range of molecular weights from 1 000 to 13 000 g · mol^−1^. Coupling efficiency was between 79 and 100%, depending on the structure of the initiator.

Coupling reaction of substituted polystyrenes using Cu(0)/PMDETA system at 90 °C.

imageCoupling reaction of substituted polystyrenes using Cu(0)/PMDETA system at 90 °C.

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