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- W4206521873 abstract "We report an efficient and phosgene-free method for the synthesis of isocyanate group (NCO)-containing polymers via Lossen rearrangement. The key monomer of N-acetoxymethacrylamide (AMAA), possessing N-acetoxy amide (AA) group was synthesized from the reaction of N-hydroxymethacrylamide (MHA) with acetic anhydride. By adjusting the feed ratio of methyl methacrylate (MMA) and AMAA, a series of AA-containing polymers (P1-P3) were prepared by free-radical polymerization. Fourier transform infrared spectroscopy (FTIR) and thermogravimetric analysis (TGA) revealed that the AA groups in polymers P1-P3 can be readily converted to isocyanate groups by heating at 130 ℃ to afford the NCO-containing polymers P4-P6 with conversion percent of 60, 77 and 78, respectively. Furthermore, the AA-containing polymers can be used as a latent NCO-containing polymer for further chemical modification, such as in-situ grafting reaction with hydroxyl compounds. The spectroscopic analyses confirmed that the dye functional group of disperse red 1 (DR1) was successfully grafted on either NCO- or AA-containing polymers." @default.
- W4206521873 created "2022-01-26" @default.
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- W4206521873 date "2022-03-01" @default.
- W4206521873 modified "2023-10-12" @default.
- W4206521873 title "Formation of reactive isocyanate group-containing polymers via Lossen rearrangement" @default.
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- W4206521873 doi "https://doi.org/10.1016/j.mtcomm.2022.103169" @default.
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