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首页> 外文期刊>RSC Advances >Hot nitric acid diffusion in fluoroelastomer composite and its degradation
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Hot nitric acid diffusion in fluoroelastomer composite and its degradation

机译：硝酸在氟弹性体复合材料中的热扩散及其降解

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摘要

Fluoroelastomers (FKM) are vital sealing materials in acidic environment and their failure can cause severe safety problems. Therefore, investigation of the degradation behavior and mechanism of FKM materials is of great significant. Herein, we investigate a diffusion model of an acidic solution into an FKM composite and its degradation behavior upon immersion in hot nitric acid solution. The results indicate that the diffusion process of the HNO _(3) solution into the FKM composite conforms to the Fick diffusion model at a low concentration of nitric acid solution. Besides, the concentration of HNO _(3) solution affects the diffusion process of solvent molecules and the dissolution process of the filler particles to some extent. SEM showed that the surface topography of the FKM was significantly altered after it was immersed in HNO _(3) solution. The structural and chemical changes of the FKM were studied using ATR-FTIR, SEM-EDS and MAS NMR, which demonstrated the occurrence of decrosslinking via hydrolysis of the crosslinks and backbone cleavage by dehydrofluorination. This was also manifested by the decrease in crosslinking degree and mechanical properties. The present study is helpful for revealing the chemical changes in FKM in hot HNO _(3) solution.
机译：氟弹性体（FKM）是酸性环境中至关重要的密封材料，其失效会导致严重的安全问题。因此，研究FKM材料的降解行为及其机理具有重要意义。本文中，我们研究了酸性溶液在FKM复合材料中的扩散模型及其在热硝酸溶液中浸泡后的降解行为。结果表明，在低浓度硝酸溶液中，HNO_（3）溶液向FKM复合材料中的扩散过程符合Fick扩散模型。此外，HNO_（3）溶液的浓度在一定程度上影响溶剂分子的扩散过程和填料颗粒的溶解过程。 SEM显示，将FKM浸入HNO_（3）溶液后，其表面形貌发生了明显变化。使用ATR-FTIR，SEM-EDS和MAS NMR研究了FKM的结构和化学变化，证明了通过交联键的水解发生脱交联和通过脱氟化氢裂解主链。这也通过交联度和机械性能的降低来证明。本研究有助于揭示热HNO_（3）溶液中FKM的化学变化。

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