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High-performance low-smoke halogen-free flame-retardant composites for Fuxing electric multiple units via synergistic effects of char formation and anti-dripping of clay-based organic sheet silicates

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Abstract

The polyethylene (PE)-based low-smoke halogen-free flame-retardant composites by introducing clay-based organic sheet silicates (COSS) into PE and ethylene–vinyl acetate copolymer (EVA) blends were prepared by melt blending method. COSS with hydroxyl and organic functional groups on the surface had a good compatibility with the polymer matrix, which favored their uniform dispersion in the polymer matrix. The introduction of COSS restricted the movement of molecular chains and raised the thermal decomposition temperature of the polymer. Meanwhile, the storage modulus and complex viscosity of the materials were raised, and the internal plastic deformation of the materials was enhanced. When the COSS content was 1 wt %, the tensile strength reached 14.7 MPa, and the elongation at break was 596%. The introduced COSS could weaken the regularity of the molecular chain, generate many holes and carriers, and reduce the crystallization ability and volume resistivity of the material. Significantly, a low addition of 3 wt % COSS could improve the density and uniformity of the carbon layer and greatly alleviate the dripping phenomenon during the burning process of the material. With the addition of 7 wt % COSS, the limiting oxygen index (LOI) of the material could reach 28.8%, and the material had a good stiffness balance and significant anti-drip effect.

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Abbreviations

COSS:

Clay-based organic sheet silicates

PE:

Polyethylene

EVA:

Ethylene–vinyl acetate copolymer

EMU:

Electric multiple units

LOI:

Limiting oxygen index

POE-g-GMA:

Glycidyl methacrylate grafted poly(ethyleneoctene)

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Funding

This research was supported by the National Natural Science Foundation of China (No. 51903002), Natural Science Foundation of Anhui Education Department (2022AH020024, 2022AH040047, gxyq2022028, 2022AH030039), Major science and technology projects of Anhui Province (202103a05020031), Anhui Jianzhu University PhD Startup Fund (2019QDZ22, 2018QD59) and University Collaborative Innovation Project of Anhui province (GXXT-2019–017), Hefei Key Technology Major R&D Projects (No. J2019G19), Research Fund for Postdoctoral Researchers in Anhui Province (2020B413), Anhui Provincial Natural Science Research Project of Colleges and Universities (YJS20210509), and Wuhu Key Technology Major R&D Projects (No. 2022yf27).

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Authors and Affiliations

  1. Anhui Province International Research Center On Advanced Building Materials, School of Materials and Chemical Engineering, Anhui Jianzhu University, Hefei, 230601, China

    Ping Wang, Xinliang Chen, Shang Gao, Li Yang, Jie Song, Hongyu Tian, Haibing Lu, Mengting Shi & Xinyun Hu

  2. Department of Polymer Science and Engineering, School of Chemistry and Chemical Engineering, Anhui Key Laboratory of Advanced Functional Materials and Devices, Hefei University of Technology, 230009, Hefei, China

    Jinping Hu & Yunsheng Ding

  3. National and Local Joint Engineering Research Center for Special Wire and Cable Branch Center of Anhui, Jianzhu University, 230601, Hefei, China

    Ping Wang

  4. Anhui Hualing Cable Group Co., Ltd, 241000, Wuhu, China

    Long Chen

  5. School of Mathematics and Physics, Anhui Jianzhu University, 230601, Hefei, China

    Min Shi

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  1. Ping Wang
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  2. Xinliang Chen
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  3. Shang Gao
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  4. Jinping Hu
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  11. Long Chen
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  13. Min Shi
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Contributions

Conceptualization: Ping Wang. Methodology: Hongyu Tian, Haibing Lu, Mengting Shi, Xinyun Hu. Formal analysis and investigation: Jinping Hu, Jie Song, Li Yang. Writing—original draft preparation: Shang Gao, Xinliang Chen. Funding acquisition: Ping Wang. Supervision: Ping Wang, Long Chen, Yunsheng Ding, Min Shi.

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Wang, P., Chen, X., Gao, S. et al. High-performance low-smoke halogen-free flame-retardant composites for Fuxing electric multiple units via synergistic effects of char formation and anti-dripping of clay-based organic sheet silicates. Adv Compos Hybrid Mater 6, 88 (2023). https://doi.org/10.1007/s42114-023-00670-z

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