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Synthesis of amphiphilic polystyrene–ionene diblock copolymers with controlled block lengths

✍ Scribed by Eugène T. W. M. Schipper; Jan C. M. van Hest; Alexander H. C. Roelofs; Pieter Piet; Anton L. German

Publisher
John Wiley and Sons
Year
1993
Tongue
English
Weight
517 KB
Volume
31
Category
Article
ISSN
0959-8103

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✦ Synopsis

Abstract

Amphiphilic polystyrene‐ionene diblock copolymers with blocks of controlled molecular weights were synthesized by a new method. The preparation starts with the anionic polymerization of styrene with 3‐(dimethylamino)propyl‐lithium as initiator, yielding tertiary amino end‐functionalized polystyrenes of molecular weights that can be varied over a wide range from 1 to 100kg/mol, and a relatively low polydispersity (M̄~w~/M̄~n~ = 1.1–1.4). The crucial step in this method is the stepwise coupling of the reactive end‐group of the polystyrene with bromo‐ and tertiary‐amino‐terminated monodisperse oligomeric 2,4‐ionenes. The amphiphilic polymers with well‐defined block lengths were characterized by thin‐layer chromatography, end‐group titration and elemental analysis. Amphiphilic block copolymers with a monodisperse ionene block consisting of up to 10 quaternary ammonium groups could be derived.

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