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Polycarbonate composites with high light transmittance, haze, and flame retardancy based on a series of incomplete-cage oligomeric silsesquioxanes

  • Composites & nanocomposites
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Abstract

A series of incomplete-cage polyhedral oligomeric silsesquioxanes (DVPOSSs) bearing vinyl groups (–CH=CH2) and phosphorus-containing groups (DOPO) have been synthesized through a hydrolytic condensation reaction. FTIR, NMR, and MALDI–TOF MS have been used to identify the structures of the DVPOSSs, which include T9, T10, and T11 cage structures. Polycarbonate (PC)/DVPOSSs composites can be achieved through simple twin-screw extrusion. The addition of DVPOSSs improves the haze of PC/DVPOSSs composites, while maintaining the high transmittance of PC control. The thermal properties and fire behavior of the PC/DVPOSSs composites have been investigated by TGA, DSC, cone calorimetry, and LOI and UL-94 tests. PC/DVPOSSs-2 and PC/DVPOSSs-4 attained a V-0 rating in 3.2-mm and 1.6-mm samples. The pyrolysis and flame-retardant mechanisms of the PC/DVPOSSs composites have been assessed on the basis of TGA–FTIR, cone calorimetry, and char layer morphology results. The main flame-retardant mechanism is that DVPOSSs induce early decomposition of the PC matrix and increase char formation, rapidly extinguishing the flame and causing an obvious reduction in heat release rate.

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Acknowledgements

This project was funded by the National Natural Science Foundation of China (51603011).

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Authors and Affiliations

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

    Xiaolu Wu, Xiaoxia Wang, Zhaolu Qin & Wenchao Zhang

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  1. Xiaolu Wu
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  2. Xiaoxia Wang
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  3. Zhaolu Qin
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  4. Wenchao Zhang
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Correspondence to Wenchao Zhang.

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Wu, X., Wang, X., Qin, Z. et al. Polycarbonate composites with high light transmittance, haze, and flame retardancy based on a series of incomplete-cage oligomeric silsesquioxanes. J Mater Sci 56, 428–441 (2021). https://doi.org/10.1007/s10853-020-05235-9

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  • DOI: https://doi.org/10.1007/s10853-020-05235-9