TY - JOUR
T1 - Mechanically Strong, Thermally Stable, and Flame Retardant Poly(ether imide) Terminated with Phosphonium Bromide
AU - Cao, Ke
AU - Guo, Yichen
AU - Zhang, Mingxuan
AU - Arrington, Clay B.
AU - Long, Timothy E.
AU - Odle, Roy R.
AU - Liu, Guoliang
N1 - Funding Information:
The material presented here is based upon work supported by SABIC (458369).
Publisher Copyright:
Copyright © 2019 American Chemical Society.
PY - 2019/10/8
Y1 - 2019/10/8
N2 - 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.
AB - 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.
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U2 - 10.1021/acs.macromol.9b01465
DO - 10.1021/acs.macromol.9b01465
M3 - Article
AN - SCOPUS:85072918662
SN - 0024-9297
VL - 52
SP - 7361
EP - 7368
JO - Macromolecules
JF - Macromolecules
IS - 19
ER -