Abstract
The polycondensation reaction of S, S-dithiocarboxylic acid esters with diamines took place at room temperature to yield polyamide in solution. The reactivity of aromatic S, S-dithioester with aliphatic diamine was higher than that of aliphatic S, S-dithioester and the reaction of S, S-dithioester with aromatic diamine was much slower than that with aliphatic diamine. Solvents greatly influenced the rate of the polycondensation and an inorganic salt such as lithium chloride accelerated the reaction. Polyisophthalamide having an inherent viscosity of 1.06 was obtained in dimethyl sulfoxide in the presence of lithium chloride at 30°C.
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Sanui, K., Ogata, N. Room-Temperature Polycondensation of S, S-Dithioesters with Diamines. Polym J 2, 783–788 (1971). https://doi.org/10.1295/polymj.2.783
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DOI: https://doi.org/10.1295/polymj.2.783