1. Flame retardancy of linear polyurethane with Diels–Alder adducts.
- Author
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Cai, Mingxin, Tian, Zeying, Cui, Liang, Fan, Tianxiang, and Du, Pengfei
- Subjects
FIREPROOFING ,POLYURETHANES ,FIREPROOFING agents ,POLYOLS ,DIELS-Alder reaction ,POLYURETHANE elastomers - Abstract
Flame retardant polyurethane was synthesized via introducing thermally reversible covalent Diels–Alder (DA) adducts into the polyurethane main chain. Firstly, furan-terminated polyurethane prepolymer(PU-Furan) was synthesized from the reaction between isocyanate-terminated prepolymer with or without DOPO-based polyester polyols and furfuryl amine. Secondly, polyurethane with DA adducts (PU-DA) was obtained via Diels–Alder reaction between PU-Furan and commercial 1,1′-(methylenedi-1,4-phenylene) bismaleimide. PU-Furan and PU-DA were characterized by DSC, TGA and
1 H NMR, confirming the introduction of the DA adducts into the polyurethane chain. The results of the limiting oxygen index test, Underwriter Laboratory 94 vertical burning (UL-94) test and cone calorimeter test demonstrated that the introduction of the DA adducts improved the flame retardancy of the polyurethane significantly, especially when the polyurethane with flame-retardant element P, due to the synergism flame-resistant effect between flame-retardant element P and thermally reversible DA adducts. [ABSTRACT FROM AUTHOR]- Published
- 2023
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