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Open AccessReview

A Comprehensive Review on Water Diffusion in Polymers Focusing on the Polymer–Metal Interface Combination

College of Pipeline and Civil Engineering, China University of Petroleum (East China), No. 66, West Changjiang Road, Huangdao District, Qingdao 266580, China
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Polymers 2020, 12(1), 138; https://doi.org/10.3390/polym12010138
Received: 4 November 2019 / Revised: 17 December 2019 / Accepted: 20 December 2019 / Published: 6 January 2020
(This article belongs to the Special Issue Polymer Structures in Solution)
Water diffusion in polymers is relevant to a broad range of physicochemical phenomena and technological processes. Although many fields contributed to rapid progress in the fundamental knowledge of water–polymer interactions, detailed understandings come mainly from interpreting numerous experiments. These studies showed that a remarkably rich variety of diffusion forms between water and even seemingly simple polymers. In this review, focusing on the gravimetric and capacitance method, we discuss contradictions and problems existing for water diffusion in polymers in detail from perspectives of experiments and models, focusing on the analysis of error derived from widely used methods, especially for the Brasher–Kingsbury equation. We also provide a perspective on outstanding problems, challenges, and open questions, including water clusters, relaxation, and electrochemical reactions at the metal/polymer interface, as well as expanding the theoretical prospective. View Full-Text
Keywords: Fick’s diffusion; diffusion coefficient; relaxation; water clusters; permittivity; effective capacitance Fick’s diffusion; diffusion coefficient; relaxation; water clusters; permittivity; effective capacitance
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MDPI and ACS Style

Yang, C.; Xing, X.; Li, Z.; Zhang, S. A Comprehensive Review on Water Diffusion in Polymers Focusing on the Polymer–Metal Interface Combination. Polymers 2020, 12, 138.

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