Synthesis of thiourethanes and poly(thiourethane)s bearing carboxylic groups by nucleophilic acylation using cyclic acid anhydrides
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A mercapto group generated by addition of 5-phenoxymethyl-1,3-oxathiolane-2-thione and benzylamine could react with cyclic acid anhydrides to give the corresponding carboxylic acids. This method was applied to a polymer modification. Poly(thiourethane)s containing mercapto groups were prepared from difunctional five-membered cyclic dithiocarbonates and diamines could react with succinic or glutaric anhydride to give the corresponding poly(thiourethane)s bearing carboxyl group in the side chains in high yield. Thermal properties of the obtained polymers were examined by thermal gravimetric analysis (TGA) and differential scanning calorimetry (DSC). The obtained polymers showed 5 % weight loss temperatures (T d5) at 170 and 216 °C. These polymers exhibited glass transition temperatures (T g) at 52 and 57 °C, respectively. Furthermore, a cross-linked poly(thiourethane) was readily obtained using difunctional cyclic acid anhydride, 1,2,3,4-butanetetracarboxylic dianhydride as a cross linker.
KeywordsPoly(thiourethane)s Five-membered cyclic dithiocarbonate Diamine Polyaddition Cyclic acid anhydride Carboxylic acid
High-resolution mass spectra were measured under the Cooperative Research Program of “Network Joint Research Center for Materials and Devices”.
- 8.Hirata M, Watanabe T, Ochiai B, Endo T (2012) Synthesis of graft terpolymers by addition reaction of amino-terminated polyether to poly(methacrylate)s bearing five-membered cyclic dithiocarbonate moieties and application of the graft terpolymers as modifiers for wool. J Polym Sci Part A Polym Chem 50:3259–3268CrossRefGoogle Scholar
- 11.Cisneros JA, Björklund E, González-Gil I, Hu Y, Canales Á, Medrano FJ, Romero A, Ortega-Gutiérrez S, Fowler CJ, López-Rodríguez ML (2012) Structure-activity relationship of a new series of reversible dual monoacylglycerol lipase/fatty acid amide hydrolase inhibitors. J Med Chem 55:824–836CrossRefGoogle Scholar