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Catalytic effect of bases in impregnation of guanidine nitrate on Poplar (Populus) wood

Flammability and multiple heating rate kinetic study

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Abstract

Wood, one of the flammable material, was treated with aqueous solution of guanidine nitrate (GUN) and also with small amount of bases like N,N-dimethylformamide, 4-dimethylaminopyridine, pyridine, and triethylamine in the treating solution. These bases catalyze the impregnation of GUN as indicated by increase in mass gain percentage, elemental analysis, and scanning electron microscopy. To study their thermal behavior, dynamic thermogravimetry (TG) and derivative thermogravimetry (DTG) analysis under nitrogen atmosphere have been applied from ambient temperature to 973 K on all samples, at multiple linear heating rates 2.5, 5, 10, and 20 K min−1. Non-isothermal, “model free” iso-conversional multiple heating rate methods, Ozawa–Flynn–Wall (O–F–W) and modified Coats–Redfern are used to calculate activation energy of samples. The activation energy of samples is found in the range 109–208 kJ mol−1. Thermal parameters like overall pyrolysis duration, maximum mass loss rate, corresponding to DTG peak maximum and percentage char yield calculated at 873 K from TG curves are used to appraise the flammability of samples. Also, flammability of samples is determined by reliable methods namely limiting oxygen index and underwriters laboratories 94 (UL 94) test. The aforesaid study indicates that base catalyzed impregnated samples are less flammable than those impregnated with only GUN and untreated ones.

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Acknowledgements

Mahesh Kumar is thankful to Council of Scientific and Industrial Research, New Delhi, India for providing senior research fellowship and Mahender Kumar is grateful to Kurukshetra University, Kurukshetra for awarding university research scholarship. We are also thankful to Vikas Kumar (BARC, Mumbai) and Vinod Kumar (IIT, Delhi) for their support.

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  1. Department of Chemistry, Kurukshetra University, Kurukshetra, 136119, India

    Sanjiv Arora, Mahesh Kumar & Mahender Kumar

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  1. Sanjiv Arora
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Correspondence to Sanjiv Arora.

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Arora, S., Kumar, M. & Kumar, M. Catalytic effect of bases in impregnation of guanidine nitrate on Poplar (Populus) wood. J Therm Anal Calorim 107, 1277–1286 (2012). https://doi.org/10.1007/s10973-011-1779-z

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  • DOI: https://doi.org/10.1007/s10973-011-1779-z

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