Ion Migration through a Polymer Solution: Microviscosity

Shun Cheng Wang, Heng Kwong Tsao

研究成果: 雜誌貢獻期刊論文同行評審

20 引文 斯高帕斯(Scopus)

摘要

The ion migration in polymer solutions of different molecular weights is investigated by conductometry for various inorganic salts. The electric conductivity κ declines with increasing the number concentration of polymer cp at a given salt concentration cs. All reduced conductivities for salts of the same valency type collapse into a single curve for a given polymer molecular weight and can be well represented by the simple exponential κ = κo(Cs) exp(-[κ]c p). Here κO is the conductivity of the salt solution in the absence of polymers, and [κ] can be regarded as an intrinsic attenuation factor. Our result indicates that the reduction of the ion mobility is mainly attributed to hydrodynamic interactions between the probe ion and polymer segments, and the specific ion effect plays a minor role. The intrinsic attenuation factor is found to be independent of the salt concentration but to vary with polymer molecular weight Mw, [κ] ∞ M w. This consequence reveals that the ion interacts with all segments of a polymer as it migrates through the coil or the network, and hence the conductivity reduction depends mainly on the polymer weight concentration.

原文???core.languages.en_GB???
頁(從 - 到)9128-9134
頁數7
期刊Macromolecules
36
發行號24
DOIs
出版狀態已出版 - 2 12月 2003

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