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Characteristics of water absorption in amine-cured epoxy network: a molecular simulation and experimental study

Abstract

Moisture corrosion of cured epoxy resins seriously affects the durability of epoxy products and has been a hot issue in scientific and engineering perspective. In this work, a series of cured epoxy resins with different structure was prepared by tuning their curing conversion in both experimental and simulation. In experiment, the equilibrium water content and diffusion coefficient of amine-cured epoxy resins were measured by gravimetric measurement. The interaction between water molecules and epoxy network was investigated by time-resolved FTIR, difference spectroscopy and 2D correlation spectroscopy. In simulation, the hydrogen bonds, the mobility of hydroxypropyl ether groups and water molecules, and the free volume with its distributions were analyzed. Five kinds of water molecules are intuitively observed in this work, free volume dominates in the competition between free volume and polarity in the bifunctional epoxy/amine system, and the increase in diffusion coefficient is considered as the result of reduction in motion resistance and the increase in channels for the motion of water molecules.

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Publication details

The article was received on 25 Jul 2018, accepted on 08 Oct 2018 and first published on 09 Oct 2018


Article type: Paper
DOI: 10.1039/C8SM01516C
Citation: Soft Matter, 2018, Accepted Manuscript
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    Characteristics of water absorption in amine-cured epoxy network: a molecular simulation and experimental study

    D. Zhang, K. Li, Y. Li, H. Sun, J. Cheng and J. Zhang, Soft Matter, 2018, Accepted Manuscript , DOI: 10.1039/C8SM01516C

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