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Thermal decomposition of polyhedral oligomeric octaphenyl, octa(nitrophenyl), and octa(aminophenyl) silsesquioxanes

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Abstract

The mechanisms of the thermal degradation of polyhedral oligomeric octaphenylsilsesquioxane (OPS), octa(nitrophenyl)silsesquioxane (ONPS), and octa(aminophenyl)silsesquioxane (OAPS) were investigated. The –NO2 or –NH2 substituents on the phenyl group affected the mechanism of the POSS thermal degradation. The thermal stabilities of OPS, ONPS, and OAPS were characterized by TG and FTIR. Thermal degradation of OPS included mainly the degradation of caged polyhedral oligomeric silsesquioxane structures and phenyl groups. Nitro or amino substituents decreased its thermal stability. The thermal degradation processes of OPS, ONPS, and OAPS differed. Phenyl groups and cyclobutadiene were observed in the OPS degradation products. Oxygen radicals that caused intensive CO2 release between 350 and 450 °C were generated by the degradation of ONPS –NO2. OAPS released mainly aminophenyl groups at 370 °C, whereas a small number of phenyl groups decomposed at 500 °C. The OAPS reactivity could enhance the thermal stability of POSS structure in the polyimide OAPS composites.

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Authors and Affiliations

  1. School of Materials Science & Engineering, Beijing Institute of Technology, Beijing, People’s Republic of China

    Haibo Fan & Rongjie Yang

  2. National Engineering Research Center of Flame Retardant Materials, Beijing Institute of Technology, Zhongguancun South Street 5, Haidian District, Beijing, 100081, People’s Republic of China

    Haibo Fan & Rongjie Yang

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  1. Haibo Fan
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  2. Rongjie Yang
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Correspondence to Rongjie Yang.

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Fan, H., Yang, R. Thermal decomposition of polyhedral oligomeric octaphenyl, octa(nitrophenyl), and octa(aminophenyl) silsesquioxanes. J Therm Anal Calorim 116, 349–357 (2014). https://doi.org/10.1007/s10973-013-3554-9

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  • DOI: https://doi.org/10.1007/s10973-013-3554-9

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