Network formation in polyethyleneglycol solutions. An intradiffusion study

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Publication Date
DOI 10.1039/A905035C
Impact Factor 3.676
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Abstract

Intradiffusion coefficients of binary mixtures, water–polyethyleneglycol (PEG) (molecular weight 200, 400, 2000, 3400, 10000 Da), were measured by pulsed gradient spin echo (PGSE)-NMR to determine the mass and concentration effects. The properties of polydisperse samples are compared with those of oligomers, and the effect of polydispersity is discussed. The PEG diffusion coefficients approach a constant value at high concentration, indicating the formation of a dynamic network between water and PEG molecules. The stochiometry of this network is evaluated and compared with the result of a model derived from an extension of gelation theory. It was found that at infinite dilution limiting self and mutual diffusion coefficients are not equal: this has been interpreted as an effect of polydispersity.

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Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
CiteScore: 5.5
Self-citation Rate: 10.3%
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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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