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Magnesium hydroxide/graphene oxide chip in flakes structure and its fire-retardant reinforcement of polypropylene

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Abstract

In the contribution, magnesium hydroxides and graphene oxide were synergistically combined to prepare the chip-in-flakes nanohybrid (Mg(OH)2/GO, MGO) via one-step hydrothermal approach for improving fire retardancy of polypropylene. Various characterizations confirmed its composition, structure and morphology. The fire-retardant evaluations illustrated that limiting oxygen index (LOI) of PP composite with 50 wt.% MGO was improved to 27.8% with UL-94 V-0 rating compared with virgin PP (17.4%, no rating). In parallel, the peak heat release rate, total heat release and smoke production rate of PP/MGO (PMG) were reduced by 80.5%, 30.8% and 79.4% respectively. The mechanism investigation uncovered that the conspicuous fire retardancy and smoke suppression were credited to the synergistic effect between GO and Mg(OH)2 toward the optimized physical barrier. Furthermore, dynamic mechanical analysis (DMA) disclosed the highest modulus (8043 MPa) at -71 °C relative to 3236 MPa of pure PP. In viewpoint, hierarchical nano-flakes with synergistic effect offered an effective approach for the fire-safe polymer.

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Acknowledgements

This research was partly funded the Natural Science Foundation of China (No. U1607104), the Science and Technology of Qinghai Program (2019-HZ-813, 2019-GX-163, 2020-GX-102 and 2020-GX-ZL07).

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Authors and Affiliations

  1. Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining, 810008, China

    Fan Guo, Yuze Zhang, Yuchen Jia, Liang Cai & Lijuan Li

  2. Qinghai Engineering and Technology Research Center of Comprehensive Utilization of Salt Lake Resources, Xining, 810008, China

    Fan Guo, Yuze Zhang, Yuchen Jia, Liang Cai & Lijuan Li

  3. University of Chinese Academy of Sciences, Beijing, 100049, China

    Fan Guo, Yuze Zhang, Yuchen Jia & Liang Cai

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  1. Fan Guo
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  2. Yuze Zhang
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  3. Yuchen Jia
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  4. Liang Cai
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  5. Lijuan Li
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Correspondence to Lijuan Li.

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Highlights

• A chip-in-flakes structure nanohybrid Mg(OH)2-GO was synthesized via one-step hydrothermal method.

• 50 wt.% Mg(OH)2-GO endowed polypropylene with UL-94 V-0, reduced the release of toxic gases and improved the fire safety of PP.

• Mg(OH)2-GO remarkably improved the mechanical properties of PP matrix.

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Guo, F., Zhang, Y., Jia, Y. et al. Magnesium hydroxide/graphene oxide chip in flakes structure and its fire-retardant reinforcement of polypropylene. J Polym Res 28, 393 (2021). https://doi.org/10.1007/s10965-021-02764-y

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  • DOI: https://doi.org/10.1007/s10965-021-02764-y

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