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A novel phthalazinone-based epoxy resin with excellent rheological property and intrinsic flame retardancy

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Abstract

Phthalazinone is a critical structural factor for high-performance polymer material, which is achieved by polar structure and the structure characteristic of unsymmetrical and kink non-coplanar. In this study, a novel phthalazinone-based epoxy (EEPZ) has been designed and synthesized. The rheological behaviors, thermal stability and combustion behaviors of cured systems have been investigated by dynamic rheology, TGA, DMA, UL-94 vertical burning and cone calorimetry tests. It was found that the phthalazinone-based EEPZ epoxy resin had the lower melting viscosity within broader processing window and enhanced char forming ability for bisphenol A epoxy/4′4-diamino-diphenyl sulfone (E44/DDS) system. When combined with only 20 wt% EEPZ in the E44 system, the E44/20%EEPZ/DDS, passed the UL-94 V-0 rating. In the combustion test, the total heat release, total smoke production and peak of heat release rate were sharply respectively decreased by 44.7%, 24.3% and 44.6% in the case of E44/20%EEPZ/DDS compared with E44/DDS. The results of morphology characterization chemical structure and component for residue char in EEPZ epoxy resin confirmed that the phthalazinone group can lead to form nitrogen-containing compact char layer during combustion. The combined technologies (TGA-FTIR, Py-GC/MS) was utilized to detect the pyrolysis process of the crosslinks system and the charring mechanism. Simultaneously, the tensile strength and tensile modulus of the composites were also improved.

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Acknowledgements

This work was supported by the National Nature Science Foundation of China (nos. U1663226, 51673033 and 51873027).

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Authors and Affiliations

  1. Department of Polymer Science & Materials, Dalian University of Technology, Dalian, China

    Fengfeng Zhang, Zhihuan Weng, Tianpeng Zhang, Jinyan Wang & Xigao Jian

  2. Liaoning Province Engineering Technology Center of High Performance Resins, Dalian, 116024, China

    Jinyan Wang & Xigao Jian

  3. AVIC Jiangxi Hongdu Aviation Industry Group Company Ltd, Nanchang, China

    Yuliang Li & Zaiyu Wang

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  1. Fengfeng Zhang
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  2. Yuliang Li
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  3. Zhihuan Weng
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  4. Tianpeng Zhang
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Correspondence to Jinyan Wang or Xigao Jian.

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Zhang, F., Li, Y., Weng, Z. et al. A novel phthalazinone-based epoxy resin with excellent rheological property and intrinsic flame retardancy. J Mater Sci 56, 9079–9092 (2021). https://doi.org/10.1007/s10853-021-05863-9

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