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Volume 15
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10.3390/polym15061381
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Article

Fabrication of Rigid Isocyanate-Based Polyimide Foam Achieved Excellent Use Safety via Synergy between Expandable Graphite and Phosphorus-Containing Polyol

by
Junhe Zhang
1,
Yingze Liu
1,
Xin Fu
2,
Ting Wang
2,
Gaohui Sun
1,*,
Xu Zhang
3 and
Shihui Han
1,*
1
College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, China
2
Wuhan Second Ship Design and Research Institute, Wuhan 430064, China
3
School of Safety Engineering, Shenyang Aerospace University, Shenyang 110136, China
*
Authors to whom correspondence should be addressed.
Polymers 2023, 15(6), 1381; https://doi.org/10.3390/polym15061381
Submission received: 1 November 2022 / Revised: 4 January 2023 / Accepted: 5 January 2023 / Published: 10 March 2023
(This article belongs to the Section Polymer Composites and Nanocomposites)
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Abstract

For the advantages of low cost, excellent thermal insulation, and sound absorption properties, the rigid isocyanate-based polyimide foam (RPIF) presents great application prospects as a building insulation material. However, its inflammability and the accompanying toxic fumes create huge safety hazard. In this paper, reactive phosphate-containing polyol (PPCP) is synthesized and employed with expandable graphite (EG) to obtain RPIF with excellent use safety. EG can be considered as an ideal partner for PPCP to weaken the drawbacks in toxic fume release. Limiting oxygen index (LOI), cone calorimeter test (CCT), and toxic gas results show that the combination of PPCP and EG can synergistically enhance flame retardancy and the use safety of RPIF owing to the unique structure of a dense char layer possessing a flame barrier and toxic gas adsorption effects. When EG and PPCP are simultaneously applied to the RPIF system, the higher EG dosage will bring higher positive synergistic effects in the use safety of RPIF. The most preferred ratio of EG and PPCP is 2:1 (RPIF-10-5) in this study; RPIF-10-5 shows the highest LOI, low CCT results and specific optical density of smoke, and low HCN concentration. This design and the findings are of great significance to improving the application of RPIF.
Keywords: rigid polyimide foams; expandable graphite; phosphorus-containing polyol; flame retardancy; toxic fume rigid polyimide foams; expandable graphite; phosphorus-containing polyol; flame retardancy; toxic fume
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MDPI and ACS Style

Zhang, J.; Liu, Y.; Fu, X.; Wang, T.; Sun, G.; Zhang, X.; Han, S. Fabrication of Rigid Isocyanate-Based Polyimide Foam Achieved Excellent Use Safety via Synergy between Expandable Graphite and Phosphorus-Containing Polyol. Polymers 2023, 15, 1381. https://doi.org/10.3390/polym15061381

AMA Style

Zhang J, Liu Y, Fu X, Wang T, Sun G, Zhang X, Han S. Fabrication of Rigid Isocyanate-Based Polyimide Foam Achieved Excellent Use Safety via Synergy between Expandable Graphite and Phosphorus-Containing Polyol. Polymers. 2023; 15(6):1381. https://doi.org/10.3390/polym15061381

Chicago/Turabian Style

Zhang, Junhe, Yingze Liu, Xin Fu, Ting Wang, Gaohui Sun, Xu Zhang, and Shihui Han. 2023. "Fabrication of Rigid Isocyanate-Based Polyimide Foam Achieved Excellent Use Safety via Synergy between Expandable Graphite and Phosphorus-Containing Polyol" Polymers 15, no. 6: 1381. https://doi.org/10.3390/polym15061381

APA Style

Zhang, J., Liu, Y., Fu, X., Wang, T., Sun, G., Zhang, X., & Han, S. (2023). Fabrication of Rigid Isocyanate-Based Polyimide Foam Achieved Excellent Use Safety via Synergy between Expandable Graphite and Phosphorus-Containing Polyol. Polymers, 15(6), 1381. https://doi.org/10.3390/polym15061381

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