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- W1979499971 abstract "The synthesis of arborescent polymers with poly(γ-benzyl L-glutamate) (PBG) side chains was achieved through successive grafting reactions. The linear PBG building blocks were produced by the ring-opening polymerization of γ-benzyl L-glutamic acid N-carboxyanhydride initiated with n-hexylamine. The polymerization conditions were optimized to minimize the loss of amino chain termini in the reaction. Acidolysis of a fraction of the benzyl groups on a linear PBG substrate and coupling with linear PBG using a carbodiimide/hydroxybenzotriazole promoter system yielded a comb-branched or generation zero (G0) arborescent PBG. Further partial deprotection and grafting cycles led to arborescent PBG of generations G1 to G3. The solvent used in the coupling reaction had a dramatic influence on the yield of graft polymers of generations G1 and above, dimethylsulfoxide being preferable to N,N-dimethylformamide. This grafting onto scheme yielded well-defined (Mw/Mn ≤ 1.06), high molecular weight arborescent PBG in a few reaction cycles, with number-average molecular weights and branching functionalities reaching over 106 and 290, respectively, for the G3 polymer. α-Helix to coiled conformation transitions were observed from N,N-dimethylformamide to dimethyl sulfoxide solutions, even for the highly branched polymers. © 2013 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2013, 51, 5270–5279" @default.
- W1979499971 created "2016-06-24" @default.
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- W1979499971 date "2013-10-08" @default.
- W1979499971 modified "2023-10-10" @default.
- W1979499971 title "Arborescent polypeptides from γ-benzyl <scp>l</scp> -glutamic acid" @default.
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- W1979499971 doi "https://doi.org/10.1002/pola.26958" @default.
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