Summary
When reacted for periods of the order of 5 to 10 minutes at temperatures approaching 300°C in the presence of certain organic phosphites, polymers containing available carboxy and aliphatic amine groups undergo amidation. Thus, when aliphatic polyamides having amine and carboxy end groups are reacted with themselves in this manner, large increases in their molecular weight rapidly take place. When carboxycontaining polymers are reacted with other, aliphatic aminecontaining polymers, block or graft copolymers are obtained.
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Aharoni, S.M. Rapid high temperature amidation in presence of organic phosphites. Polymer Bulletin 10, 210–214 (1983). https://doi.org/10.1007/BF00272226
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DOI: https://doi.org/10.1007/BF00272226