Elastomers and Composites

The Rubber Society of Korea (한국고무학회)
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Thermal Stability of Phenylphosphonic Acid Modified Polyurethanes

  • Dong-Eun Kim (Department of Chemical Engineering, Dong-A University) ;
  • Seung-Ho Kang (Department of Chemical Engineering, Dong-A University) ;
  • Sang-Ho Lee (Department of Chemical Engineering, Dong-A University)
  • Received : 2023.04.25
  • Accepted : 2023.05.26
  • Published : 2023.06.30
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Abstract

The effect of phenylphosphonic acid (PPOA) on polyurethane (PU) thermal stability was studied through Fourier transform infrared spectroscopy and Thermogravimetric analysis. To synthesize PPOA-modified PUs (PPOA-PUs), polyether-type diols (Mw=62, 106, 190, 419, 605) were chemically modified with PPOA and then reacted with 4,4'-dicyclohexylmethane diisocyanate (H12MDI) and 4,4-diphenylmethane diisocyanate (MDI). During thermal decomposition in air, the PPOA embedded in the PUs formed intumescent phosphocarbonaceous char. Below 400℃, PPOA-H12MDI-PUs were more unstable, as PPOA decomposed at lower temperatures than phenyl groups and aliphatic ethers. Above 550℃, the thermal stability of PUs followed this order: PPOA-MDI-PUs > PPOA-H12MDI-PUs > MDI-PUs > H12MDI-PUs. At 700℃, unmodified PUs had no residue, while the PPOA-MDI-PU residue was 4.4~23.0 wt.% and the PPOA-H12MDI-PU residue was 1.5~17.5 wt.%. The enhanced thermal stability of PPOA-MDI-PUs at high temperatures can be attributed to the synergetic effect of PPOA and phenyl groups on the formation of phosphocarbonaceous char.

Keywords

Acknowledgement

This work was supported by the Dong-A University research fund.

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