4.4 Article

Synthesis of Symmetrical Triblock Copolymers of Styrene and N-isopropylacrylamide Using Bifunctional Bis(trithiocarbonate)s as RAFT Agents

Journal

MACROMOLECULAR CHEMISTRY AND PHYSICS
Volume 210, Issue 7, Pages 565-578

Publisher

WILEY-V C H VERLAG GMBH
DOI: 10.1002/macp.200800575

Keywords

amphiphiles; controlled free radical polymerization; reversible addition fragmentation chain transfer (RAFT); self-organization; triblock copolymers

Funding

  1. DFG [LA611/7, MU1487/8, PA771/4]
  2. Fonds der Chemischen Industrie

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Six new bifunctional bis(trithiocarbonate)s were explored as RAFT agents for synthesizing amphiphilic triblock copolymers ABA and BAB, with hydrophilic A blocks made from N-isopropylacrylamide and hydrophobic B blocks made from styrene. Whereas the extension of poly(N-isopropylacrylamide) by styrene was not effective, polystyrene macroRAFT agents provided the block copolymers efficiently. End group analysis by H-1 NMR spectroscopy supported molar mass analysis and revealed an unexpected side reaction for certain bis(trithiocarbonate)s, namely a fragmentation to simple trithiocarbonates while extruding ethylene-trithiocarbonate. The amphiphilic block copolymers with short polystyrene blocks are directly soluble in water and self-organize into thermo-responsive micellar aggregates.

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