Interaction of sodium and potassium ions with PEO-PPO copolymer investigated by FTIR,Raman and NMR |
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| Institution: | 1. Key Laboratory of Green Process and Engineering, State Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, PR China;2. University of the Chinese Academy of Sciences, Beijing 100049, PR China;3. Beijing National Laboratory for Molecular Sciences, State Key Laboratory for Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, PR China;1. College of Mining Engineering, Taiyuan University of Technology, Taiyuan, Shanxi 030024, China;2. Western Australia School of Mines, Curtin University, Kalgoorlie, WA 6430, Australia;3. Key Laboratory of In-situ Property-improving Mining of Ministry of Education, Taiyuan University of Technology, Taiyuan, Shanxi 030024, China;1. Central Research Institute of Electric Power Industry (CRIEPI), Japan;2. Electric Power Engineering Systems Co., LTD., Japan;3. Osaka Soda Co., LTD., Japan;4. University of Hyogo, Japan;1. Dodd-Walls Centre for Photonic and Quantum Technologies, Department of Chemistry, University of Otago, PO Box 56, Dunedin 9054, New Zealand;2. School of Pharmacy, University of Otago, PO Box 56, Dunedin 9054, New Zealand;3. Department of Anatomy, University of Otago, PO Box 56, Dunedin 9054, New Zealand;1. Theoretical Chemistry, Lund University, POB 124, SE-221 00 Lund, Sweden;2. Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, United States |
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| Abstract: | Many papers have reported that salt ions can exert a great influence on the self-assembly behavior of PEO-PPO copolymers in the aqueous solution. Whereas the mechanism through which salt ions influence the self-assembly behavior of PEO-PPO copolymers is unclear and the dispute is mainly focused on whether the salt ions have a direct interaction with PEO-PPO copolymers. In this paper, the interaction of sodium and potassium ions with PEO-PPO copolymer was investigated by using FTIR, Raman and 23Na NMR spectroscopy. Experimental results reveal that direct interactions between salt cations and PEO-PPO macromolecular chains indeed occur in appropriate conditions. The present work highlights the role of cations in the self-assembly process of PEO-PPO copolymer. |
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| Keywords: | PEO-PPO copolymer Self-assembly Interactions Cations Vibrational band shift |
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