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International Journal of Energetic Materials and Chemical Propulsion

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ISSN Печать: 2150-766X

ISSN Онлайн: 2150-7678

The Impact Factor measures the average number of citations received in a particular year by papers published in the journal during the two preceding years. 2017 Journal Citation Reports (Clarivate Analytics, 2018) IF: 0.7 To calculate the five year Impact Factor, citations are counted in 2017 to the previous five years and divided by the source items published in the previous five years. 2017 Journal Citation Reports (Clarivate Analytics, 2018) 5-Year IF: 0.7 The Immediacy Index is the average number of times an article is cited in the year it is published. The journal Immediacy Index indicates how quickly articles in a journal are cited. Immediacy Index: 0.1 The Eigenfactor score, developed by Jevin West and Carl Bergstrom at the University of Washington, is a rating of the total importance of a scientific journal. Journals are rated according to the number of incoming citations, with citations from highly ranked journals weighted to make a larger contribution to the eigenfactor than those from poorly ranked journals. Eigenfactor: 0.00016 The Journal Citation Indicator (JCI) is a single measurement of the field-normalized citation impact of journals in the Web of Science Core Collection across disciplines. The key words here are that the metric is normalized and cross-disciplinary. JCI: 0.18 SJR: 0.313 SNIP: 0.6 CiteScore™:: 1.6 H-Index: 16

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CURE KINETICS OF POLY NITRATOMETHYL OXETANE WITH DIFFERENT ISOCYANATES STUDIED BY DIFFERENTIAL SCANNING CALORIMETRY

Том 13, Выпуск 5, 2014, pp. 471-477
DOI: 10.1615/IntJEnergeticMaterialsChemProp.2014010649
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Краткое описание

This paper reports cure kinetics of poly nitratomethyl oxetane (PLN) with different isocyanates like isophorane di-isocyanate (IPDI) and hexamethylene di-isocyanate (HMDI). Reactions were monitored by differential scanning calorimetry (DSC) in the presence of two different cure catalysts namely di butyl tin di laurate (DBTDL) and ferric tris acetyl acetonate (FeAA) and their effect on the cure reaction was studied. Cure kinetics was evaluated using the multiple heating rate Ozawa method. The reactivity of two isocyanates and catalytic efficiencies were determined based on DSC reaction temperature, activation energy, and rate constants. Based on cure temperatures, FeAA catalyzed reactions have lower cure temperature than DBTDL catalyzed reactions, inferring that FeAA is a more active catalyst for PLN cure reactions. Rate constants (k) of FeAA catalyzed PLN cure reactions were higher than of DBTDL catalyzed reactions. The values of activation energies (Ea), pre-exponential factor, and rate constant also support the same trend. Completion of the curing process was monitored with the help of Fourier transform infrared. Viscosity buildup was measured with the help of rheometer by taking curing profiles for each system at 30° C and it followed the similar trend as determined by DSC.

Ключевые слова: cure kinetics, catalyst, isocyanates, PLN
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