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- W2051211966 abstract "In this paper we describe the synthesis and characterization of modified polyurethaneurea−polyether (PEUU) multiblock copolymers, designed to elicit lower permeability to water vapor and gases. The approach was to create polyisobutylene (PIB) segments, which were linked to the PEUU copolymer as combs. Macromonomers of PIB were synthesized, containing two hydroxyl sites on the initiating ends of the molecules for subsequent condensation polymerization. By using a polymerization scheme that offered no termination and no chain transfer, the PIB macromonomer would be assured of having two (and only two) hydroxyl groups. Characterization of the macromonomers and their precursors was performed by GPC, 1H NMR, and FTIR. Using these products, amphiphilic copolymers, with a polyurethaneurea−polyether multiblock backbone and polyisobutylene combs, were synthesized by a condensation reaction. PIB incorporation varied between about 2 and 30%, with comb lengths ranging from ∼3000 to 29 000 g/mol. Characterization of this new multiblock multicomb copolymer was performed by GPC, FTIR, solid state 13C NMR, and Soxhlet extraction techniques." @default.
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- W2051211966 date "2000-06-01" @default.
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- W2051211966 title "Synthesis and Characterization of Amphiphilic Poly(urethaneurea)-<i>comb</i>-polyisobutylene Copolymers" @default.
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- W2051211966 doi "https://doi.org/10.1021/ma9919920" @default.
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