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Effect of Aliphatic and Aromatic Chain Extenders on Thermal Stability of Graphene Oxide/Polyurethane Hybrid Composites Prepared by Sol‐Gel Method
ChemistrySelect ( IF 1.9 ) Pub Date : 2020-01-17 , DOI: 10.1002/slct.201903953 Reza Behnam 1 , Hossein Roghani‐Mamaqani 1 , Mehdi Salami‐Kalajahi 1 , Hanieh Mardani 1
ChemistrySelect ( IF 1.9 ) Pub Date : 2020-01-17 , DOI: 10.1002/slct.201903953 Reza Behnam 1 , Hossein Roghani‐Mamaqani 1 , Mehdi Salami‐Kalajahi 1 , Hanieh Mardani 1
Affiliation
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Hybrid composites of graphene and polyurethane (PU) were prepared via sol‐gel method. The isocyanate‐terminated PUs with chain extenders of pyromellitic dianhydride (PMDA) and butanediol were reacted with (3‐aminopropyl) triethoxysilane (APTES) to obtain Polyurethane with PMDA chain extender (PUI) and Polyurethane with BD chain extender (PUBD), respectively. Sol‐gel reaction between the silane‐modified polyurethanes with APTES‐modified graphene oxide resulted in the hybrid composites with high thermal degradation temperature and char content. Results of Fourier‐transform infrared spectroscopy and proton nuclear magnetic resonance analysis confirmed chemical modification of graphene and successful preparation of the bifunctional silane‐modified PUI and PUBD, respectively. Based on the thermogravimetric analysis (TGA) results, PMDA chain extender resulted in higher degradation temperature and char content in the hybrid composites. In addition, siloxane networks formed by sol‐gel process resulted in synergistic effects on improving thermal stability of the PU materials. X‐ray diffraction results in addition to the scanning and transmission electron microscopy images confirmed successful oxidation of graphite and also its modification process.
中文翻译：
脂肪族和芳香族链增长剂对溶胶-凝胶法制备的氧化石墨烯/聚氨酯杂化复合材料热稳定性的影响
通过溶胶-凝胶法制备石墨烯和聚氨酯的杂化复合材料。将带有均苯四酸二酐（PMDA）和丁二醇的扩链剂的异氰酸酯封端的PU与（3-氨基丙基）三乙氧基硅烷（APTES）反应，分别制得带有PMDA扩链剂的聚氨酯（PUI）和带有BD扩链剂的聚氨酯（PUBD）。硅烷改性的聚氨酯与APTES改性的氧化石墨烯之间的溶胶-凝胶反应导致杂化复合材料具有较高的热降解温度和炭含量。傅里叶变换红外光谱和质子核磁共振分析的结果证实了石墨烯的化学修饰，并分别成功制备了双官能硅烷修饰的PUI和PUBD。根据热重分析（TGA）结果，PMDA扩链剂导致杂化复合材料中较高的降解温度和炭含量。此外，通过溶胶-凝胶工艺形成的硅氧烷网络对提高PU材料的热稳定性产生了协同作用。除扫描和透射电子显微镜图像外，X射线衍射结果还证实了石墨的成功氧化及其改性过程。
更新日期：2020-01-17
中文翻译：
脂肪族和芳香族链增长剂对溶胶-凝胶法制备的氧化石墨烯/聚氨酯杂化复合材料热稳定性的影响
通过溶胶-凝胶法制备石墨烯和聚氨酯的杂化复合材料。将带有均苯四酸二酐（PMDA）和丁二醇的扩链剂的异氰酸酯封端的PU与（3-氨基丙基）三乙氧基硅烷（APTES）反应，分别制得带有PMDA扩链剂的聚氨酯（PUI）和带有BD扩链剂的聚氨酯（PUBD）。硅烷改性的聚氨酯与APTES改性的氧化石墨烯之间的溶胶-凝胶反应导致杂化复合材料具有较高的热降解温度和炭含量。傅里叶变换红外光谱和质子核磁共振分析的结果证实了石墨烯的化学修饰，并分别成功制备了双官能硅烷修饰的PUI和PUBD。根据热重分析（TGA）结果，PMDA扩链剂导致杂化复合材料中较高的降解温度和炭含量。此外，通过溶胶-凝胶工艺形成的硅氧烷网络对提高PU材料的热稳定性产生了协同作用。除扫描和透射电子显微镜图像外，X射线衍射结果还证实了石墨的成功氧化及其改性过程。
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