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Influence of Core-Shell Structure and Cladding Sequence of Microencapsulated Ammonium Polyphosphate on the Flame-Resistant and Smoke Inhibition Efficiency for PBAT Composites

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Abstract

To demonstrate the influence of core-shell structure of microencapsulated ammonium polyphosphate (MCAPPs) on the flame-resistant and smoke inhibition efficiency of polymer composites, four kinds of MCAPPs with unilaminar or bistratal shells were fabricated and used to fabricate flame retarded Poly (butyleneadipate-co-terephthalate) (PBAT) composites. The MCAPP with cross-linked β-cyclodextrin as outer layer (MFAPP-CD1) exhibited the highest flame-resistant efficiency. Accordingly, 75P/25MFAPP-CD1 showed the highest char residue and densest char layer, also the lowest pHRR and THR, decreasing by 77.4 and 76.9% compared with PBAT, respectively. Meanwhile, the lowest SPR and TSP also demonstrated its excellent smoke inhibition effect due to the weakened catalytic effect of Ammonium polyphosphate (APP) on carbonization agent. As a result, a LOI value (33.2%) and UL-94 V0 rating could be achieved. A reasonable core-shell structure could improve the carbon forming capacity and reduce the release of volatiles during combustion. Polyhydroxy carbonization agent should be designed as the outer layer of bistratal MCAPP.

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Funding

The authors are grateful for financial supports from the Foundation of Guangxi Key Laboratory of Clean Pulp & Papermaking and Pollution Control, College of Light Industry and Food Engineering, Guangxi University (No. 2021KF30), National Natural Science Foundations of China (No. 22208069 and 51603118) and the Key Research & Development Project of Shaanxi Province (No. 2019GY-195).

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Authors and Affiliations

  1. College of Bioresources Chemical and Materials Engineering, Key Laboratory of Paper based Functional Materials of China National Light Industry, National Demonstration Center for Experimental Light Chemistry Engineering Education, Shaanxi University of Science & Technology, Xi’an, China

    Xiaopeng Yue, Siqian Zhang & Yang Xu

  2. Huangpu Hydrogen Energy Innovation Center/Guangzhou Key Laboratory for Clean Energy and Materials, School of Chemistry and Chemical Engineering, Guangzhou University, Guangzhou, 510006, China

    Siqian Zhang & Ling Meng

  3. Guangxi Key Laboratory of Clean Pulp & Papermaking and Pollution Control, College of Light Industry and Food Engineering, Guangxi University, Nanning, China

    Zhiwei Wang

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  1. Xiaopeng Yue
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  5. Ling Meng
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Contributions

All authors contributed to the study conception and design. Material preparation, data collection and analysis were performed by SZ, YX and LM. The first draft of the manuscript was written by SZ and XY. All authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

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Correspondence to Ling Meng.

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Yue, X., Zhang, S., Xu, Y. et al. Influence of Core-Shell Structure and Cladding Sequence of Microencapsulated Ammonium Polyphosphate on the Flame-Resistant and Smoke Inhibition Efficiency for PBAT Composites. J Polym Environ 31, 4752–4769 (2023). https://doi.org/10.1007/s10924-023-02917-8

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