Optical microinterferometry method for evaluation of phase state and diffusion in ternary systems: phase separation in cellulose/N-Methylmorpholine-N-oxide/non-solvent mixtures

International Workshop on Physical and Chemical Processes in Atomic Systems

Makarova, V.V.^1 ; Antonov, S.V.^1 ; Anokhina, T.A.^1 ; Volkov, V.V.^1,2

A.V.Topchiev Institute of Petrochemical Synthesis RAS, Moscow, Russia^1

National Research Nuclear University MEPhI, Moscow Engineering Physics Institute, Kashirskoe highway 31, Moscow

115409, Russia^2

关键词: Cellulose solutions;    Film morphology;    Inter-diffusion coefficients;    Isopropyl alcohols;    Microinterferometry;    N methylmorpholine N oxide;    Non-solvents;    Phase state;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/751/1/012045/pdf
DOI  :  10.1088/1742-6596/751/1/012045

来源: IOP

【 摘 要 】

Microinterferometry technique was used to evaluate the phase state and diffusion of cellulose solutions N-Methylmorpholine-N-oxide upon contact with non-solvents (water and aqueous solutions of isopropyl alcohol). The method was helpful in visualization of the structure of the forming cellulose film in connection with the diffusivity of the components of the systems. The interdiffusion coefficient were determined. Isopropyl alcohol addition to water slows down the diffusion of the coagulant into the cellulose solution thus delaying cellulose precipitation. Increase of temperature leads to formation of less dense cellulose film morphology with large vacuoles.