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Estimation of Flame Retardancy Effect by Thermal Analysis Using Kinetic Parameters Obtained under Non‐Isothermal Conditions in Air
Author(s) -
Vlase Gabriela,
Vlase Titus,
Doca Nicolae,
Ilia Gheorghe
Publication year - 2009
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.200990322
Subject(s) - endothermic process , chemistry , kinetic energy , thermal decomposition , isothermal process , decomposition , homogeneity (statistics) , activation energy , thermodynamics , phosphoric acid , enthalpy , analytical chemistry (journal) , chemical engineering , organic chemistry , adsorption , physics , statistics , mathematics , quantum mechanics , engineering
A series of compounds obtained from urea, phosphoric acid and inorganic salts of Zn, Ni and Ca, were tested in respect of their flame‐retardancy behavior. The estimation criteria were the kinetic parameters obtained in air, under non‐isothermal conditions, on a Perkin‐Elmer Diamond device, at heating rates of 5, 10, 12 and 15 deg·min −1 . The flame‐retardancy effect was assigned to the significant endothermic decomposition at relatively low temperature (150–200°C). The quantitative estimation of the thermal behavior was performed by comparison of the kinetic data obtained by Flyn‐Wall‐Ozawa, Friedman and NPK (Sempere‐Nomen) methods. The kinetic homogeneity and a very good quality of the model are arguments in favour of the NPK method. The Ni containing material exhibited the best flame‐retardancy behavior, i.e. higher activation energy and mass loss, respectively a single decomposition step with both physical and chemical processes. The results were validated by fire resistance tests.