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International Journal of Energetic Materials and Chemical Propulsion

Published 6 issues per year

ISSN Print: 2150-766X

ISSN Online: 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

Indexed in

NG PLASTICIZED PE−PCP BINDER-BASED ADVANCED SOLID ROCKET PROPELLANTS: STUDIES ON MECHANICAL PROPERTIES

Volume 11, Issue 2, 2012, pp. 123-134
DOI: 10.1615/IntJEnergeticMaterialsChemProp.2012004717
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ABSTRACT

The mechanical properties of solid rocket propellants play a vital role in the efficient functioning of rocket motors over a wide range of temperatures. A propellant grain must maintain its structural integrity during storage, handling, and various dynamic loads, such as acceleration during flight. The tensile strength, percentage elongation and elastic modulus are the inherent properties of the propellant and are more significant during the development of solid propellant for a particular mission. The polymeric binder largely determines the mechanical properties of the propellant. In this study, the mechanical properties of the cured prepolymer, cured nitroglycerin (NG) plasticized pentaerythritol−polycaprolactone prepolymer (PE−PCP) binder, and propellants have been evaluated at different temperatures. The glass transition temperatures (Tg) of these samples were also evaluated to study the effect of plasticization, isocyanate used as the curing agent, and the NCO:OH ratio. Propellant formulations for case-bonded applications having high plasticizer (Pl) to polymer (Po) ratio (Pl/Po > 2) containing solid energetic materials as ingredients were evaluated for their structural integrity by determining the mechanical properties at ambient (+27° C), cold (−40° C), and hot (+55° C) conditions. It has been observed that the tensile strength, percent elongation, and elastic modulus increase at the cold condition (−40° C) compared to the ambient and hot conditions. This distinctive characteristic of the propellant is due to the presence of highly plasticized prepolymer in the formulation.

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