Ultrafast synthesis of ultrahigh molar mass polymers by metal-catalyzed living radical polymerization of acrylates, methacrylates, and vinyl chloride mediated by SET at 25 degrees C
2006 (English)In: Journal of the American Chemical Society, ISSN 0002-7863, E-ISSN 1520-5126, Vol. 128, no 43, 14156-14165 p.Article in journal (Refereed) Published
Conventional metal-catalyzed organic radical reactions and living radical polymerizations (LRP) performed in nonpolar solvents, including atom-transfer radical polymerization (ATRP), proceed by an innersphere electron-transfer mechanism. One catalytic system frequently used in these polymerizations is based on Cu(I)X species and N-containing ligands. Here, it is reported that polar solvents such as H2O, alcohols, dipolar aprotic solvents, ethylene and propylene carbonate, and ionic liquids instantaneously disproportionate Cu(I)X into Cu(0) and Cu(II)X-2 species in the presence of a diversity of N-containing ligands. This disproportionation facilitates an ultrafast LRP in which the free radicals are generated by the nascent and extremely reactive Cu(0) atomic species, while their deactivation is mediated by the nascent Cu(II)X-2 species. Both steps proceed by a low activation energy outer-sphere single-electron-transfer (SET) mechanism. The resulting SET-LRP process is activated by a catalytic amount of the electron-donor Cu(0), Cu2Se, Cu2Te, Cu2S, or Cu2O species, not by Cu(I) X. This process provides, at room temperature and below, an ultrafast synthesis of ultrahigh molecular weight polymers from functional monomers containing electronwithdrawing groups such as acrylates, methacrylates, and vinyl chloride, initiated with alkyl halides, sulfonyl halides, and N-halides.
Place, publisher, year, edition, pages
2006. Vol. 128, no 43, 14156-14165 p.
terminator multifunctional initiator, organocobalt porphyrin complexes, dissociative electron-transfer, methyl-methacrylate, ambient-temperature, dimethyl-sulfoxide, alpha, omega-di(iodo)poly(vinyl chloride), sulfonyl chlorides, aqueous-media, dendritic macromolecules
IdentifiersURN: urn:nbn:se:kth:diva-16083DOI: 10.1021/ja065484zISI: 000241519600053OAI: oai:DiVA.org:kth-16083DiVA: diva2:334125
QC 201005252010-08-052010-08-052011-07-11Bibliographically approved