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首页> 外文期刊>Journal of Applied Polymer Science >Thermal stability of end-capped and linear sulfonated polyimides, sulfonated polystyrene, and Nafion 117
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Thermal stability of end-capped and linear sulfonated polyimides, sulfonated polystyrene, and Nafion 117

机译：端盖和直链磺化聚酰亚胺，磺化聚苯乙烯和Nafion 117的热稳定性

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摘要

The thermal stability of end-caped and linear sulfonated polyimides (SPIs), sulfonated polystyrene (SPS), and a sulfonated perfluorinated hydrocarbon, Nafion 117, and the corresponding triethylammonium sulfonate salts was investigated by dynamic and isothermal thermogravimetric analysis (TGA). Gas chromatographic-mass spectrographic analysis (GC/MS) of the sulfonated polymers and the salts to determine the volatiles released from acid and salt groups over a temperature range 200-275 degrees C was also investigated. GC/MS analysis reveals that water and sulfur dioxide volatiles are released from the sulfonic acids and water, sulfur dioxide and triethyl amine are released from the sulfonate salts. Dynamic and isothermal TGA studies based on weight loss revealed that the SPIs exhibited superior thermal stability than SPS and Nafion 117 sulfonic acids. However, dynamic TGA curves to determine the onset decomposition temperature of the sulfonic acid group reveal that Nafion 117 and SPS sulfonic acids exhibited greater thermal stabilities than the SPIs. The mechanisms of sulfonic acid and triethylammonium sulfonate salt decompositions based on GC/MS, C-13-NMR, and dynamic TGA curves are proposed. (c) 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 45694.
机译：最终斗篷的和线性磺化聚酰亚胺（SPI接口），磺化聚苯乙烯（SPS），和磺化的全氟烃，全氟磺酸117，以及相应的三乙基磺酸盐的热稳定性通过动态和等温热重量分析（TGA）分析。气相色谱 - 质谱分析的磺化聚合物和以确定的温度范围内200-275摄氏度，还研究了从酸和盐的基团释放的挥发性物质的盐（GC / MS）。 GC / MS分析表明，水和二氧化硫挥发物从磺酸和水释放，二氧化硫和三乙胺从磺酸盐释放。动态和基于重量损失等温TGA的研究显示，SPI的表现出比SPS和Nafion 117磺酸优异的热稳定性。然而，动态TGA曲线以确定所述磺酸基团的起始分解温度揭示的Nafion 117和SPS磺酸显示出比的SPI更大的热稳定性。磺酸和三乙基磺酸盐分解的基于GC / MS，C-13-NMR，和动态TGA曲线的机制提出。 （c）2017 Wiley期刊，Inc.J.Phill。聚合物。 SCI。 2018年，135，45694。

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