A new synthetic route for bio-based, highly-thermostable polyamides with a rigid N-substituted pyrrolidone ring from salts of various diamines and a biomonomer itaconic acid, which was mass-produced by the fermentation of <i>Aspergillus terreus</i>, was developed. We used monomer-salts composed of itaconate anions and aliphatic diamino cations. These salts converted into polyamides through the aza-Michael addition, followed by intramolecular cyclization with condensation to create the pyrrolidone ring in the polymer main-chain in the presence of sodium dihydrogen phosphate. The polyamides showed molecular weights ranging over 28 000 and Tg values over 87 <sup>o</sup>C higher than those of conventional nylons. The itaconic-acid derived polyamides showed a ring-opening reaction under the ultraviolet irradiation in water and the resin showed a photo-corrosion and additionally in-soil-corrosion.

Corrosion behavior of biopolyamides derived from itaconic acid

2019 Spring National Meeting

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