FLORY-HUGGINS PARAMETER FOR REACTION BETWEEN CELLULOSE AND METHYLMORPHOLINE-N-OXIDE IN MIXTURES WITH APROTIC AND PROTON-DONATING SOLVENTS

Swelling of hydrocellulose is studied in binary mixtures containing me thylmorpholine-N-oxide (MMNO) and aprotic and proton-containing diluen ts, viz., dimethylformamide and methanol. From the values of the equil ibrium degree of swelling of the polymer, the interaction parameters c hi1 of the cellulose-aminooxide mixture have been calculated. The valu e of chi1 for MMNO monohydrate was equal to 0.5. For anhydrous MMNO, t he value of chi1 was significantly less than 0.35-0.40. Application of aprotic solvents as a second component is more suitable (in the therm odynamic sense) than proton-containing solvents.