15. Viscoelastic Properties and Adsorption Behaviors of Two Coal Soluble Constituents with Different Solubility in N-Methyl-2-pyrrolidinone

抄録

Two kinds of pyridine insoluble fractions (PI) of coal extracts with different solubility in N-methyl-2-pyrrolidinone (NMP) were characterized. PI-0 was obtained by pyridine fractionation of Upper Freeport (UF) coal extracts with CS_2/NMP mixed solvent (1:1 by volume), and its solubility in NMP is 53wt% at room temperature. While, PI-1, which was obtained by the removal of NMP and TBAA from PI-0 solution in NMP containing tetrabutylammonium acetate (TBAA) was almost completely soluble in NMP. Elementary analysis and ^<13>C NMR spectra indicated that the two PIs have the same chemical structures. The viscoelastic properties and adsorption behaviors of the two PIs were investigated. The results obtained here suggested that the less aggregated state of PI-1 is responsible for its high solubility.