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- W2050286276 abstract "The anionic polymerization of N,N-dimethylacrylamide (DMAAm) was carried out in THF with a binary initiator system prepared from thienyllithium and the Lewis acids triethylaluminium (Et3Al), diethylzinc (Et2Zn) or triethylborane (Et3B). Polymerizations proceeded in a homogeneous manner and gave polymers having controlled molecular weights. However, in presence of alkoxides the polymerization resulted in polymers insoluble in THF, even when using Et3Al. A synthetic route for the synthesis of polyisobutylene-b-PDMAAm was developed by combining living carbocationic and anionic polymerizations. Thiophene end-capped polyisobutylene (PIB-T), prepared by cationic polymerization, was metalated with n-butyllithium in THF at −40°C. The resulting stable macrocarbanion (PIB-T−, Li+), in conjunction with Lewis acids, was used to initiate the living anionic polymerization of DMAAm, resulting in a new amphiphilic block co-polymer PIB-b-PDMAAm. The molecular structure was characterized by size exclusion and adsorption chromatography and NMR, and the micellisation in aqueous solution was characterized by fluorometry and dynamic light scattering." @default.
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- W2050286276 date "2006-01-01" @default.
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- W2050286276 title "Anionic polymerization of N,N-dimethylacrylamide with thienyllithium and synthesis of block co-polymers of isobutylene and N,N-dimethylacrylamide by site transformation of chain ends" @default.
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- W2050286276 doi "https://doi.org/10.1163/156855506775526151" @default.
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