Abstract
This paper describes the results of a detailed investigation on the dynamic behavior of poly(ethylene glycol), PEG, with low molar mass (200, 300, 400 and 600gmol−1) and water in all ranges of concentrations. The study is based on spin–spin (T2), spin–lattice (T1) relaxation times and on the variations of the proton chemical shift. The relaxations of the exchangeable and non-exchangeable hydrogen atoms depend on the mobility of the molecules of the solutions. Therefore, the results of T1 and T2 allow one to determine the transitions between the dilute, semi-dilute and concentrate polymeric regimes, and they were well correlated with the kinematic viscosity of the solutions. The distribution of water molecules between the ethylene oxide and the terminal hydroxyl groups of PEG in the entire regime was investigated by using high-field NMR, and the characteristic average number of water molecules belonging to the hydration layer of PEG was also determined.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
