Abstract
The introduction of amino, methylamino, or dimethylamino groups onto a carbon black surface was achieved by the reaction of carbon black having acyl azide groups with corresponding ethylenediamines. It was found that in the presence of carbon black having these amino groups, the anionic ring-opening polymerization of γ-methyl l-glutamate N-carboxyanhydride (NCA) is initiated to give polypeptide-grafted carbon black. The percentage of grafting of the polypeptide onto carbon black having primary amino groups (0.29 mmol g−1) in dioxane at 40°C was up to 23.7%. The percentage of grafting of polypeptide onto carbon black having tertiary amino groups was lower than that onto carbon black having primary or secondary amino groups. This may be due to the propagation of polypeptide from carbon black surface in the polymerization initiated by carbon black having primary amino groups. On the contrary, in the polymerization initiated by tertiary amino groups, ungrafted polymer was preferentially formed because the polymerization is initiated by γ-methyl l-glutamate NCA anion formed by the abstraction of hydrogen from the NCA by tertiary amino groups.
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Tsubokawa, N., Kobayashi, K. & Sone, Y. Grafting of Polypeptide from Carbon Black by the Ring-Opening Polymerization of γ-Methyl l-Glutamate N-Carboxyanhydride Initiated by Amino Groups on Carbon Black Surface. Polym J 19, 1147–1155 (1987). https://doi.org/10.1295/polymj.19.1147
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DOI: https://doi.org/10.1295/polymj.19.1147
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