期刊
POLYMERS
卷 3, 期 1, 页码 587-601出版社
MDPI
DOI: 10.3390/polym3010587
关键词
poly(ethylene glycol); sodium polyacrylate; ATPS; Flory-Huggins theory; phase diagram; hydrophobic ions
资金
- FAPESP (Fundacao Amparo de Pesquisa em Sao Paulo)
- Research Foundation of the State of Sao Paulo, Brazil
- CNPq [304543/2006-3]
Aqueous two-phase systems consisting of polyethylene glycol (PEG), sodium polyacrylate (NaPAA), and a salt have been studied. The effects of the polymer size, salt type (NaCl, Na2SO4, sodium adipate and sodium azelate) and salt concentrations on the position of the binodal curve were investigated. The investigated PEG molecules had a molar mass of 2,000 to 8,000 g/mol, while that of NaPAA was 8,000 g/mol. Experimental phase diagrams, and tie lines and calculated phase diagrams, based on Flory-Huggins theory of polymer solutions are presented. Due to strong enthalpic and entropic balancing forces, the hydrophobicity of the added salt has a strong influence on the position of the binodal, which could be reproduced by model calculations.
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