Controlled radical polymerization of styrene in miniemulsion mediated by PEO-based trithiocarbonate macromolecular RAFT agents
作者： Thomas Boursier , Isabelle Chaduc , Jutta Rieger , Franck D'Agosto , Muriel Lansalot
DOI: 10.1039/C0PY00237B
关键词:
摘要: Poly(ethylene oxide) (PEO) based macroRAFT agents with various chemical structures have been used as both stabilizer and control agent for the polymerization of styrene in miniemulsion conditions. Trithiocarbonate (PEO-DTTC (Z = thiododecyl), PEO-PTTC thiopropyl)) functional groups were attached to a commercial monomethyl ether PEO (Mn 2000 g mol−1). PEO-DTTC allowed formation stable miniemulsions water. Our previous results (A. M. Dos Santos, T. Le Bris, C. Graillat, F. D'Agosto, Lansalot, Macromolecules, 2009, 42, 946) showed that PEO-based dithiobenzoate (PEO-DB) led controlled but also broad molar mass distribution (PDI 1.9) multipopulated polymer chains. The switch from PEO-DB greatly improved 1.6). This was ascribed ability be localized at water/monomer droplets interface. An increase concentration polymerization. However, concomitant micelles favored secondary nucleation. attenuated by use PEO-PTTC, less prone form water which quality 1.3) particle size particles constituted well-defined PEO-b-PS These could attributed more efficient anchoring monomer droplet or particle/water interface showing crucial role structure these systems.
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