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Kinetics of thermal degradation of poly(aryl ether)s containing phthalazinone and life estimation

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Abstract

New special engineering thermoplastics, poly(phthalazinone ether sulfone) (PPES) and poly(phthalazinone ether sulfone ketone) (PPESK), containing phthalazinone are synthesized through step-polymerization. The kinetics of thermal degradation of PPES and PPESK (1/1) in nitrogen is investigated at several heating rates by thermogravimetry (TG). It is concluded that, based on using Satava’s theory, the thermal degradation mechanism of PPESK (1/1) is nucleation and growth, the order of reaction of the degradation process is one (n = 1). In contrast, the thermal degradation mechanism of PPES is a phase boundary controlled reaction and the order of the reaction is two (n = 2). The kinetic parameters, including reaction energy and frequency factor of thermal degradation reaction for PPES and PPESK (1/1) are analyzed using isoconversional Friedman, Kissinger–Akahira–Sunose (K–A–S) and Ozawa method. In addition, the study focus on the influence of heating rate and ratio of ketone/sulfone on thermal stability and the life estimation are described.

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Abbreviations

A :

Frequency factor (min−1)

E :

Apparent activation energy (kJ mol−1)

K :

Rate constant (min−1)

R :

Gas constant = 8.314 × 10−3 (kJ mol−1 K−1)

t :

Reaction time (min)

T :

Sample temperature (K)

α:

(W 0 − W)/(W 0 − W ∞)

dα/dt :

Normalized mass-loss rate (min−1)

β:

Heating rate = dT/dt

W 0 :

Sample mass at start time (mg)

W :

Sample mass at time t (mg)

W ∞ :

Sample mass at end time (mg)

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Acknowledgements

This work was financially supported by Education Office of Liaoning Province (No.2008567). The authors would like to thank Dr. K. He (Concordia University, Montreal, Canada) for him to have a proofreading of the manuscript.

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Authors and Affiliations

  1. Key Laboratory of Applied Technology of Polymer Materials, The Education Department of Liaoning Province, Shenyang Institute of Chemical Technology, Shenyang, 110142, People’s Republic of China

    W. He, F. Deng, W. Lin & Y.-Y. Jiang

  2. Department of Polymer Science & Materials, Dalian University of Technology, Dalian, 116012, People’s Republic of China

    G.-X. Liao & X.-G. Jian

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  1. W. He
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  2. F. Deng
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  3. G.-X. Liao
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Correspondence to W. He.

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He, W., Deng, F., Liao, GX. et al. Kinetics of thermal degradation of poly(aryl ether)s containing phthalazinone and life estimation. J Therm Anal Calorim 100, 1055–1062 (2010). https://doi.org/10.1007/s10973-009-0515-4

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  • DOI: https://doi.org/10.1007/s10973-009-0515-4

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