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Thermal behavior of saturated phthalic-type polyesters. Influence of the branching polyol

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Abstract

The influence of the branching polyol on the thermal behavior of phthalic anhydride (PA)–polyol polyesters was determined under non-isothermal conditions. The polyol was glycerol, trimethylolpropane, and pentaerythritol, used in a molar ratio of 1.5:1, 1.5:1, and 2:1 in respect of anhydride, respectively. The thermal behavior of the synthesized polyesters was qualitatively estimated by the thermoanalytical curves obtained at a heating rate of 10 °C min−1. Quantitatively, the thermal behavior of the prepared polyesters was studied by a kinetic analysis using three different methods: Friedman, Flynn–Wall–Ozawa, and modified nonparametric kinetic method. By all the samples, two thermodegradation steps were observed. The beginning of the first step of degradation was considered the qualitative criterion for the thermal stability estimation: The pentaerythritol-containing polyester was the most thermostable, until 195 °C. Also the kinetic analysis the same sample presented the highest activation energy, i.e., the lowest thermodegradation rate.

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Acknowledgements

This work was supported by POSCCE Grant No. 12PO102418/5124/22.05.2014, SMIS 50328: “New energetic efficient technology for synthesis of polyester copolymers.”

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Authors and Affiliations

  1. Research Center for Thermal Analysis in Environmental Problems, West University of Timisoara, 16 Pestalozzi St., 300115, Timisoara, Romania

    Gabriela Vlase, Dorina Modra, Paul Albu, Iulia Ceban, Constantin Bolcu & Titus Vlase

  2. Faculty of Pharmacy, “Vasile Goldis” West University of Arad, 86 L. Rebreanu St., 310414, Arad, Romania

    Paul Albu

Authors
  1. Gabriela Vlase
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  2. Dorina Modra
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  3. Paul Albu
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  4. Iulia Ceban
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  5. Constantin Bolcu
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  6. Titus Vlase
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Correspondence to Titus Vlase.

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Vlase, G., Modra, D., Albu, P. et al. Thermal behavior of saturated phthalic-type polyesters. Influence of the branching polyol. J Therm Anal Calorim 127, 409–414 (2017). https://doi.org/10.1007/s10973-016-5667-4

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  • DOI: https://doi.org/10.1007/s10973-016-5667-4

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