Mechanically Strong, Thermally Stable, and Flame Retardant Poly(ether imide) Terminated with Phosphonium Bromide

Ke Cao, Yichen Guo, Mingxuan Zhang, Clay B. Arrington, Timothy E. Long, Roy R. Odle, Guoliang Liu

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

High mechanical strength, thermal stability, and flame retardancy are three crucial criteria for high-performance polymers to be suitable for aerospace applications. Most polymers, however, cannot meet the three criteria simultaneously. Herein, phosphonium bromide-terminated poly(ether imide)s (PEI-PhPPh3Br) simultaneously possessing high mechanical strength, thermal stability, and flame retardancy were synthesized by functionalizing dianhydride-terminated poly(ether imide)s (PEI-DA) with triphenyl-4-aminophenylphosphonium bromide. With the judiciously designed end group, PEI-PhPPh3Br exhibited excellent tensile properties, thermal stability, and flame retardancy. Importantly, PEI-PhPPh3Br with a molecular weight of 12 kDa [PEI-PhPPh3Br (12k)] showed a tensile strength of 109 ± 4 MPa and a Young's modulus of 2.75 ± 0.12 GPa, much higher than those of the noncharged PEI analogue. Additionally, PEI-PhPPh3Br (12k) showed outstanding flame retardancy, better than the state-of-the-art commercial PEIs, as evidenced by the high limiting oxygen index of 51% and high char yield of 60% at 980 °C. The study herein provides a highly effective strategy to simultaneously improve mechanical strength, thermal stability, and flame retardancy, which are three important properties rarely possessed by most polymers.

Original languageEnglish (US)
Pages (from-to)7361-7368
Number of pages8
JournalMacromolecules
Volume52
Issue number19
DOIs
StatePublished - Oct 8 2019
Externally publishedYes

ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics
  • Inorganic Chemistry
  • Materials Chemistry

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