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学者姓名：刘育豪
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Abstract ：
The unclear understanding of the water diffusion behavior posts a big challenge to the manipulation of water absorption properties in epoxy resins. Herein, we investigated the water diffusion behavior and its relationship with molecule structures inside an epoxy resin mainly by the nonequilibrium molecular dynamics and experiments. It is found that at the initial rapid water absorption stage, bound water and free water both contribute, while at the later slow water absorption stage, free water plays a dominant role. The observed evolution of free water and bound water cannot be explained by the traditional Langmuir model. In addition, molecule polarity, free volume, and segment mobility can all influence the water diffusion process. Hence, the epoxy resin with low polarity and high molecular segment mobility is endowed with higher diffusion coefficients. The saturated water absorption content is almost dependent on the polarity. The understanding of how water diffuses and what decides the diffusion process is critical to the rational design of molecule structures for improving the water resistance in epoxy resin.
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| GB/T 7714 | Liu, Yuhao , Lin, Ying , Zhang, Yunxiao et al. Understanding Water Diffusion Behaviors in Epoxy Resin through Molecular Simulations and Experiments [J]. | LANGMUIR , 2024 , 40 (9) : 4871-4880 . |
| MLA | Liu, Yuhao et al. "Understanding Water Diffusion Behaviors in Epoxy Resin through Molecular Simulations and Experiments" . | LANGMUIR 40 . 9 (2024) : 4871-4880 . |
| APA | Liu, Yuhao , Lin, Ying , Zhang, Yunxiao , Cao, Bin , Wu, Kangning , Wang, Liming . Understanding Water Diffusion Behaviors in Epoxy Resin through Molecular Simulations and Experiments . | LANGMUIR , 2024 , 40 (9) , 4871-4880 . |
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Abstract ：
Herein, the coupling relationship between molecule structure and ion conductivity in silica filled silicone gel are established. Based on the broadband dielectric spectrum, the concentration of ion charges and ions diffusion coefficients, two key roles for ion conductivity, are calculated. The concentration of ion charges is increased by about four orders of magnitude after the addition of silica. Because of the more short-length chains conformations and more amorphous regions at interfaces, the chains at interfaces are easier to rearrange with higher relaxation frequency, which enhances the ions diffusion process and contributes to negative decoupling exponents between the interface molecule relaxations and ion diffusion coefficients in silicone gel composites. With the increase of fumed silica loading, the ionic conductivity increases first and decreases owing to percolation phenomenon about silica dispersion. Meanwhile, decoupling exponents of the interface molecules are closer to 0. Our findings deepen the understanding how the interface structures act on ions conductivity in insulating polymer composites, which is critical to rationally design interface structures for manipulating the insulation performances.
Keyword ：
Dielectricity Dielectricity Electrical properties Electrical properties Interface Interface Non-destructive testing Non-destructive testing Polymer -matrix composites (PMCs) Polymer -matrix composites (PMCs)
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| GB/T 7714 | Lin, Ying , Dong, Liye , Heng, Chuanle et al. Coupling relationship between molecule structure at silica/silicone gel interfaces and ionic conductivity in polymer composites [J]. | COMPOSITES SCIENCE AND TECHNOLOGY , 2024 , 249 . |
| MLA | Lin, Ying et al. "Coupling relationship between molecule structure at silica/silicone gel interfaces and ionic conductivity in polymer composites" . | COMPOSITES SCIENCE AND TECHNOLOGY 249 (2024) . |
| APA | Lin, Ying , Dong, Liye , Heng, Chuanle , Chen, Kai , Liu, Yuhao . Coupling relationship between molecule structure at silica/silicone gel interfaces and ionic conductivity in polymer composites . | COMPOSITES SCIENCE AND TECHNOLOGY , 2024 , 249 . |
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