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Novel acid–base complexes were prepared from κ-carrageenan (Cg) and 2-mercaptoimidazole (MIm). FTIR absorption measurements revealed that Cg and MIm interact through proton exchange reactions between the sulfonic acid groups of Cg and the imino nitrogen atoms of MIm. DSC thermograms suggested that the extent of the Cg–MIm intermolecular interactions could be modulated by the doping amount of MIm....
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