To the Methodology of Phase Transition Temperature Determination in Aqueous Solutions of Thermo-Sensitive Polymers

G. A. Mun; I. Moldakhan; S. B. Kabdushev; B. B. Yermukhambetova; R. Shaikhutdinov; G. Zh. Yeligbayeva

doi:10.18321/ectj960

Authors

G. A. Mun Al-Farabi Kazakh National University, 71 Al-Farabi ave., Almaty, Republic of Kazakhstan
I. Moldakhan Almaty University of Power Engineering and Telecommunications, 126/1 Baitursynova str., Almaty, Kazakhstan
S. B. Kabdushev Almaty University of Power Engineering and Telecommunications, 126/1 Baitursynova str., Almaty, Kazakhstan
B. B. Yermukhambetova Al-Farabi Kazakh National University, 71 Al-Farabi ave., Almaty, Republic of Kazakhstan
R. Shaikhutdinov Al-Farabi Kazakh National University, 71 Al-Farabi ave., Almaty, Republic of Kazakhstan
G. Zh. Yeligbayeva Satbayev University, 22a Satpaev str., Almaty, Kazakhstan

DOI:

https://doi.org/10.18321/ectj960

Keywords:

Thermo-sensitive polymers, Solution turbidity, Phase portrait, Copolymerization, Light scattering intensity

Abstract

An advanced methodology of phase transition determination in aqueous solutions of thermo-sensitive polymers by using of the phase portraits method has been suggested. The methodology allows highly accurate determining the temperature when exactly a half of molecules loses solubility (from the maximum number that can go to another phase state under given conditions). It is shown that since phase transition passes usually in a wide enough temperature interval this indicator should be used as a quantitative parameter that characterizes phase transition process. Additionally the suggested methodology allows introducing one more quantitative parameter that reflects a sharpness of phase transition. The methodology is verified by an example of phase transitions study in aqueous solutions of thermo-sensitive copolymers based on N-vinylpyrrolidone and vinyl propyl ether.

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