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Preparation and properties of ceramifiable flame-retarded silicone rubber composites

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Abstract

Ceramifiable flame-retardant silicone rubber composites were prepared by silicone rubber (SR) as the base polymer, and ammonium polyphosphate, calcium carbonate, sericite mica, and glass frits were utilized as additives. The flammability and thermal stability properties of ceramifying silicone rubber composites were studied by the limiting oxygen index (LOI), microscale combustion calorimetry (MCC), and thermogravimetric analysis (TG). The ceramic residues formed at various temperatures were studied by mechanical testing, scanning electron microscopy (SEM), and X-ray diffraction (XRD). The results indicated that the ceramifying silicone rubber achieved a LOI value of 31.2% and the flexural strength of ceramic residues formed at 1000 °C was 19.7 MPa. Moreover, the MCC results demonstrated that the heat release rate and total release rate of the composites were reduced significantly compared to the corresponding value of neat SR. The TG showed that the residue of composites was approximately 61.5% at 700 °C, as significantly higher than that the residue of neat SR. The XRD results demonstrated that fluoroapatite and Ca2SiO4 crystals were produced in the ceramic residue at high temperatures. The SEM analysis depicted that the number of holes was reduced and a dense structure was formed as the sintering temperature increased, leading to the excellent mechanical properties of formed ceramics at high temperatures.

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Acknowledgements

The authors sincerely acknowledge ‘Scientific and Technological Achievements Transformation Program of Jiangsu Province (SBA2014010034)’ and ‘Ningbo Industrial Major Projects (201601ZD-A01026)’.

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Authors and Affiliations

  1. Polymer Processing Laboratory, Key Laboratory for Preparation and Application of Ultrafine Materials of Ministry of Education, School of Material Science and Engineering, East China University of Science and Technology, Shanghai, 200237, People’s Republic of China

    Feipeng Lou, Wei Yan, Weihong Guo, Ting Wei & Qiuying Li

  2. Collaborative Innovation Center for Petrochemical New Materials, Anqing, 246011, Anhui, People’s Republic of China

    Weihong Guo

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  1. Feipeng Lou
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  2. Wei Yan
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Correspondence to Weihong Guo.

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Lou, F., Yan, W., Guo, W. et al. Preparation and properties of ceramifiable flame-retarded silicone rubber composites. J Therm Anal Calorim 130, 813–821 (2017). https://doi.org/10.1007/s10973-017-6448-4

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  • DOI: https://doi.org/10.1007/s10973-017-6448-4

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