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Thermal and FTIR spectral studies of N,N′-diphenylguanidine

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Abstract

Thermal decomposition of N,N′-diphenylguanidine (DPG) was investigated by simultaneous TG/DSC-FTIR techniques under nonisothermal conditions. Online FTIR measurements illustrate that aniline is a major product of DPG decomposition. The observation that the activation energy depends on the extent of conversion indicates that the DPG decomposition kinetics features multiple processes. The initial elimination of aniline from DPG involves two pathways because of the isomerization of DPG. Mass spectrometry and thin film chromatography suggest that there are two major intermediate products with the major one of C21N3H17. The most probable kinetic model deduced through multivariate nonlinear regression method agrees well with the experimental data with a correlation coefficient of 0.9998. The temperature-independent function of conversion f(α), activation energy E and the pre-exponential factor A of DPG decomposition was also established through model-fitting method in this research.

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Acknowledgements

This work is supported through NSFC (21073133 and 20843007), Zhejiang Provincial Natural Science Foundation (Y4080177, Y4090248 and Y5100283) and Zhejiang Provincial Ministry of Education (Y200907715).

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Authors and Affiliations

  1. Nano-materials and Chemistry Key Laboratory, Wenzhou University, Wenzhou, Zhejiang, 325035, China

    Q. Hu, H. L. Jin, X. A. Chen & S. Wang

  2. Department of Pharmacology, School of Basic Medicine, Hangzhou Normal University, Hangzhou, Zhejiang, 310036, China

    Q. Hu

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  1. Q. Hu
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Correspondence to S. Wang.

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Hu, Q., Jin, H.L., Chen, X.A. et al. Thermal and FTIR spectral studies of N,N′-diphenylguanidine. J Therm Anal Calorim 110, 593–599 (2012). https://doi.org/10.1007/s10973-011-1948-0

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  • DOI: https://doi.org/10.1007/s10973-011-1948-0

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