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Flame retardancy and mechanical properties of silicone rubber foam composite reinforced with ZnNiAl layered double hydroxides

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Abstract

Herein, various of silicone rubber foam (SRF) composites containing tri-metallic zinc-nickel-aluminum layered double hydroxides (ZnNiAl-LDH) were fabricated though a dehydrogenative foaming strategy. The chemical composition and structure of ZnNiAl-LDH were characterized by a series of measurements. The incorporated ZnNiAl-LDH filler exhibited good dispersion level in SRF matrix, and the SRF-LDH1 possessed a denser pore structure. Taking advantages of the lamellar structure and catalytic function of ZnNiAl-LDH, the most efficient improvements in mechanical, thermal stability, and flame retardancy properties were achieved for the SRF-LDH1 composite containing 1 wt% of LDH. Particularly, the SRF-LDH1 exhibited significantly increase in tensile strength (36.8 kPa), elongation at break (50.2%), compression stress (65.3 kPa), limiting oxygen index (28.6%), and UL-94 rating (V0) than the pristine SRF. In addition, the SRF-LDH1 showed significantly reductions in THR (37.9%) and TSP (30.4%), and the relevant time of TTI and TPHRR delayed about 2 times, as compared to the SRF. The present work affords a new approach to prepare silicone rubber foam composite with improved application performances.

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Acknowledgement

This research was supported by the Sichuan Province Science and Technology Support Program (2023YFS0421).

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  1. Sichuan Fire Research Institute of Ministry of Emergency Management, Chengdu, 610036, China

    Weining Du, Zejiang Zhang, Hao Huang & Chaolu Yin

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  1. Weining Du
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  2. Zejiang Zhang
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  3. Hao Huang
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  4. Chaolu Yin
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Correspondence to Chaolu Yin.

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Du, W., Zhang, Z., Huang, H. et al. Flame retardancy and mechanical properties of silicone rubber foam composite reinforced with ZnNiAl layered double hydroxides. J Polym Res 30, 384 (2023). https://doi.org/10.1007/s10965-023-03768-6

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