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Aging of HTPB/AP-based composite solid propellants, depending on the NCO/OH and triol/diol ratios
Date
2001-02-07
Author
Hocaoglu, O
Ozbelge, T
Pekel, F
Özkar, Saim
Metadata
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Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License
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Aging behavior of hydroxyl-terminated polybutadiene/ammonium perchlorate (HTPB/AP)-based composite solid propellants was studied as a function of crosslink density, which is predominantly determined by the molar ratio of diisocyanate to total hydroxyl (NCO/OH ratio) and the molar ratio of triol to diol (triol/diol ratio). For this purpose, 16 propellant samples with different compositions were prepared by changing the NCO/OH ratio as 0.81, 0.82, 0.83, and 0.85 for each triol/diol ratio of 0.07, 0.09, 0.11, and 0.13, and subjected to an accelerated aging at 65 degreesC. The changes in the mechanical properties were monitored throughout the aging period. In the initial part of the aging period, a sharp increase in stress, modulus, and hardness values and a sharp decrease in strain values were observed for all the propellants. At further stages of aging, only slight changes were observed in the mechanical properties. Concerning the aging criterion as reduction in the strain capability more than the half of the initial value, the propellants with respective NCO/OH-triol/diol ratios of 0.81-0.09, 0.85-0.09, 0.81-0.13, 0.83-0.13, and 0.85-0.13 can be considered to be aged with time. (C) 2000 John Wiley & Sons, Inc.
Subject Keywords
Composite
,
Propellant
,
Mechanical properties
,
Aging
,
HTPB
,
Triol
,
Diisocyanate
URI
https://hdl.handle.net/11511/40243
Journal
JOURNAL OF APPLIED POLYMER SCIENCE
DOI
https://doi.org/10.1002/1097-4628(20010207)79:6<959::aid-app10>3.3.co;2-7
Collections
Department of Chemistry, Article
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Changes in the mechanical properties of hydroxyl-terminated polybutadiene/ammonium perchlorate-based composite solid propellants were studied during the curing period with respect to variations in the crosslink density, which was predominantly determined by the equivalent ratio of diisocyanate to total hydroxyl (NCO/OH ratio) and the equivalent ratio of triol to diol (triol/diol ratio). For this purpose, 16 propellants were prepared in different compositions through changes in the NCO/OH ratios (0.81, 0.82,...
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O. Hocaoglu, T. Ozbelge, F. Pekel, and S. Özkar, “Aging of HTPB/AP-based composite solid propellants, depending on the NCO/OH and triol/diol ratios,”
JOURNAL OF APPLIED POLYMER SCIENCE
, pp. 959–964, 2001, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/40243.