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The thermal transformation of an aromatic poly (amide), poly (ortho-oxyamide) and poly (benzoxazole)

  • Polymers
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Abstract

The thermal behaviour of three aromatic polymers, poly(3,3-dioxy-4,4-diphenylmethane) (POA), poly(2,2-m-phenylene-5,5-dibenzoxazolemethane) (PBO) and a commercial poly-(phenyleneisophthalamide) (Phenylon) was studied by thermal analysis, i.e. DSC and TG. PBO was formed by the progressive thermocyclization of POA. By transforming POA into PBO the thermal stability was increased proportionally to the degree of cyclization, due to the stiffening of the polymer chain. PBO was found to be more thermally stable than Phenylon. The activation energies of the desorption of moisture, cyclization and thermal degradation of the polymers in both nitrogen and air were determined from non-isothermal TG data.

Zusammenfassung

Mittels DSC und TG wurde das thermische Verhalten von drei aromatischen Polymeren untersucht: Poly(3,3-dioxy-4,4-diphenylmethan) (POA), Poly(2,2-m-Phenylen-5,5-dibenzoxazolmethan) (PBO) und handelsübliches Poly (phenylen-isophthalamid) (Phenylon). PBO in PBO erhöht sich wegen der Versteifung der Polymerketten die thermische Stabilität proportional zum Cyclisierungsgrad. PBO ist thermisch stabiler als Phenylon. Anhand der nichtisothermen TG-Daten wurden sowohl in Stickstoff als auch in Luft die Aktivierungsenergien von Feuchtigkeitsdesorption, Cyclisierung und thermischem Abbau der Polymere ermittelt.

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Authors and Affiliations

  1. Polymer department, Moscow mendeleev institute of chemical technology, Miusskaja square 9, 125190, Moscow, Russia

    K. A. Voloshchuk, S. V. Martinov, A. I. Donskikh & G. M. Tseitlin

  2. Faculty of technology and metallurgy, University of beograd, Karnegieva 4, YU-11000, Beograd, P.O.B. 494, Yugoslavia

    I. Popovic & J. Velickovic

Authors
  1. K. A. Voloshchuk
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  2. I. Popovic
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  3. S. V. Martinov
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  4. A. I. Donskikh
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  5. G. M. Tseitlin
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  6. J. Velickovic
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Voloshchuk, K.A., Popovic, I., Martinov, S.V. et al. The thermal transformation of an aromatic poly (amide), poly (ortho-oxyamide) and poly (benzoxazole). Journal of Thermal Analysis 40, 773–782 (1993). https://doi.org/10.1007/BF02546651

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  • DOI: https://doi.org/10.1007/BF02546651

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