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Investigation of the thermal degradation kinetics of ceramifiable silicone rubber-based composite

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Abstract

A kind of ceramifiable rubber-based composite with high-temperature resistance and flame retardancy was prepared by adding silicate glass frits (SGFs) and ammonium polyphosphate (APP) to silicone rubber matrix. The ceramifiable performance was further improved by enhancing thermal stability of the composite through incorporating organo-modified montmorillonite (OMMT). The high-temperature resistance and ceramifiable performance of the ceramifiable silicone rubber-based composite under various pyrolysis conditions were tested. For the fired specimen of silicone rubber/SGF/APP/OMMT, its flexural strength decreased from 4.80 to 3.23 MPa as the heating rate increased from 5 to 20 K min–1, which means that lower heating rate is more favorable to form a compact and dense ceramic body. The influence of thermal stability on the ceramization effects of the ceramifiable silicone rubber-based composite was quantitatively analyzed from the perspective of thermal degradation kinetics based on the Kissinger, Kissinger--Akahira--Sunose, and Flynn--Wall--Ozawa methods. The results show that the pyrolysis activation energy Ea of the composite has a certain relationship with the ceramifiable performance. The better the thermal stability of the composite is, the higher the Ea is and the better the ceramifiable performance is. The Ea increased with the process of ceramization reaction of the composite. The reliability of the regular relation between combustion intensity of material itself, external ablation conditions, and ceramization effect was also verified through cone calorimetry and scanning electron microscope analysis. These results are helpful in preparing ceramifiable polymer composite, which possesses high-temperature resistance.

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Acknowledgements

This work was supported by National Natural Science Foundation of China (No. 22175088), the General Project of Basic Science (Natural Science) Research in Colleges and Universities in Jiangsu Province (No. 22KJB430028), the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD), and Postgraduate Research & Practice Innovation Program of Jiangsu Province.

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Authors and Affiliations

  1. College of Material Science and Engineering, Nanjing Tech University, Nanjing, 211816, China

    Dong Zhao, Tianming Liu, Yaozong Xu, Jun Zhang, Yucai Shen & Tingwei Wang

  2. Jiangsu Collaborative Innovation Center for Advanced Inorganic Function Composites, Nanjing, 211816, China

    Dong Zhao, Tianming Liu, Yaozong Xu & Tingwei Wang

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  1. Dong Zhao
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Contributions

DZ contributed to the study conceptualization, methodology, software, validation, formal analysis, resources, data curation, funding acquisition, and writing---original draft. Conceptualization, methodology, software, data curation, and validation were performed by TL and YX. Methodology, data curation, and validation were performed by JZ. Conceptualization, methodology, data curation, writing---review & editing, supervision, project administration, and funding acquisition were performed by YS and TW.

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Correspondence to Yucai Shen or Tingwei Wang.

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Zhao, D., Liu, T., Xu, Y. et al. Investigation of the thermal degradation kinetics of ceramifiable silicone rubber-based composite. J Therm Anal Calorim 148, 6487–6499 (2023). https://doi.org/10.1007/s10973-023-12138-9

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