期刊
JOURNAL OF PHYSICAL CHEMISTRY B
卷 122, 期 13, 页码 3454-3464出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcb.7b10420
关键词
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资金
- China Scholarship Council [201606280242]
- Russian Foundation for Basic Research [16-03-00895-a]
We present results from an experimental dynamic light-scattering study of poly(ethylene oxide) (PEO) in both a pure solvent (water) and a mixed solvent (tert-butanol + water). The concentration dependence of the diffusive relaxation of the PEO molecules is found to be typical of polymers in a good solvent. However, the mesoscopic diffusive behavior of PEO in the mixed solvent is very different, indicating an initial collapse and subsequent reswelling of PEO caused by co-nonsolvency. Furthermore, in the solutions of PEO with very large molecular weights, we found additional hydrodynamic modes indicating the presence of PEO clusters and aggregates similar to those found by some other investigators.
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