Experimental study of the equation of state and the surface tension of water-soluble polymers: poly(ethylene glycol)-b-poly(propylene glycol)-b-poly(ethylene glycol) + water at 298.15 K

Literature Information

Publication Date 2001-04-24
DOI 10.1039/B007495K
Impact Factor 3.676
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Abstract

The equation of state of poly(ethylene glycol)-b-poly(propylene glycol)-b-poly(ethylene glycol) (PEG–PPG–PEG) + water has been measured in the sol phase at 298.15 K and up to 40 MPa. For the sake of comparison two mixtures of (PEG + PPG) + water, with the same PEG: PPG ratio as the copolymer, have been measured. The differences found between the data of the copolymer and the blend solutions are well beyond the experimental precision, the compressibility for the copolymer mixtures being larger than for the blend one. Contrary to previous non-aqueous mixtures, the aqueous ones present deviations with respect to the corresponding states equation proposed by the group of Sanchez (I. C. Sanchez, J. Cho and W. J. Chen, Macromolecules, 1993, 26, 4234). The surface tension γ results show that both PEG–PPG–PEG and PPG are surface active, leading to a strong decrease of γ with respect to that of water even for very low polymer concentrations. The behaviour of the spinodal pressure of the system is discussed in terms of the compressibility and the surface tension data.

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Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
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Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.

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