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首页> 外文期刊>Journal of Applied Polymer Science >Microscopic Fourier transform infrared/differential scanning calorimetry system used to study the different thermal behaviors of polymethacrylate copolymers of Eudragits RS, RL, E 30D, or E
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Microscopic Fourier transform infrared/differential scanning calorimetry system used to study the different thermal behaviors of polymethacrylate copolymers of Eudragits RS, RL, E 30D, or E

机译：显微傅里叶变换红外/差示扫描量热系统，用于研究Eudragits RS，RL，E 30D或E的聚甲基丙烯酸酯共聚物的不同热行为

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The thermal stability of Eudragits RL, RS, E 30D, and E films was qualitatively investigated by the reflectance Fourier transform infrared microspectroscopy equipped with differential scanning calorimetry (FTIR/DSC microscopic system). DSC and thermogravimetric analysis (TGA) were also used to study the thermal behavior of the granules of the raw material and the film of these polymers. The results indicate that the Eudragit RL, RS, or E 30D polymer exhibited a higher thermal-stable behavior, but Eudragit E easily formed the six-membered cyclic anhydride through heating process via the inter- or intramolecular ester condensation. The leaving group in Eudragit E molecule was larger than that in Eudragit E 30D, and the leaving group of salt in Eudragit RS or RL was too stable to polycondense. The DSC thermograms and TGA curve also confirmed this result. (C) 2000 John Wiley & Sons, Inc. [References: 22]
机译：Eudragits RL，RS，E 30D和E薄膜的热稳定性通过配备差示扫描量热仪（FTIR / DSC显微镜系统）的反射傅立叶变换红外显微技术进行了定性研究。 DSC和热重分析（TGA）也用于研究原料颗粒和这些聚合物薄膜的热行为。结果表明，Eudragit RL，RS或E 30D聚合物表现出较高的热稳定性能，但Eudragit E通过分子间或分子内酯缩合的加热过程容易形成六元环酐。 Eudragit E分子中的离去基团大于Eudragit E 30D中的离去基团，Eudragit RS或RL中的盐离去基团太稳定而无法缩聚。 DSC热分析图和TGA曲线也证实了这一结果。 （C）2000 John Wiley＆Sons，Inc. [参考：22]

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