|315. Schacher, F.H.; Müllner, M.; Schmalz, H.; Müller, A.H.E.: New Block Copolymers with Poly(N,N-dimethylaminoethyl methacrylate) as a Double Stimuli-Responsive Block, Macromol. Chem. Phys. 210, 256 (2009) -- DOI: 10.1002/macp.200800557 -- PDF|
|Key words: anionic polymerization, block copolymers, dimethyl-aminoethyl methacrylate, ethylene oxide, phosphazene, stimuli-responsive polymers|
The synthesis of several diblock copolymers with DMAEMA via anionic polymerization is presented; PS-b-PDMAEMA, PB-b-PDMAEMA, poly(p-tert-butoxystyrene)-b-PDMAEMA, and PEO-b-PDMAEMA. The latter was synthesized using sec-butyllithium as initiator in presence of the phosphazene base t-BuP4, enabling a facile changeover from an oxyanion to a carbanion. All reactions resulted in narrowly distributed block copolymers (PDI < 1.1). For PEO-b-PDMAEMA, diblock copolymers with a high blocking efficiency and a near-narrow molecular weight distribution (PDI < 1.40) could be prepared. The advantage of the presented one-pot synthesis is a significant higher blocking efficiency compared to commercially available PEO macroinitiators under similar conditions.
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