Prediction on the compatibility of chitosan/polyvinyl alcohol blend based on Schneier mixing enthalpy

• Published in: Thermochimica acta Vol. 714; p. 179251
• Main Authors: Wang, Zhen, Zhao, Baobao, Zhang, Dewei, Sun, Yanyan, Li, Jianxin
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.08.2022
• Subjects: Chitosan; Compatibility; Polyvinyl alcohol; Schneier mixing enthalpy; Solubility parameter; Solubility parameter; Polyvinyl alcohol; Chitosan; Compatibility; Schneier mixing enthalpy
• ISSN: 0040-6031; 1872-762X
• DOI: 10.1016/j.tca.2022.179251

•The compatibility of CS/PVA blend was predicted through Schneier mixing enthalpy.•CS with a deacetylation of 85.34% was proved to be partially miscible with PVA.•Polymer microphase separation occurred when the mass ratio of CS/PVA reached 4:6.•Results of Schneier mixing enthalpy coincided with that of morphology evolution. A polymer blend system was established with chitosan (CS) and polyvinyl alcohol (PVA). The compatibility of CS/PVA blend was predicted via Schneier mixing enthalpy, and the effects of deacetylation on the blend compatibility were further investigated. In addition, CS/PVA blend membranes were prepared via solvent evaporation. Results showed that CS/PVA blends were completely compatible systems when the deacetylation was 50%-82.89%, while the blends turned into partially compatible ones when the deacetylation was more than 82.89%. Herein, CS was revealed to be partially miscible with PVA, and the blend became compatible as CS content was less than 32% or more than 76%. Moreover, the morphology evolution of the blend membranes verified that CS was miscible with PVA as the mass ratio reached 4:6. It was basically consistent with the prediction results derived from Schneier mixing enthalpy. [Display omitted]