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Rheology of Concentrated AP/HTPB Suspensions Prepared at the Upper Limit of AP Content
Author(s) -
Kohga Makoto,
Hagihara Yutaka
Publication year - 2000
Publication title -
propellants, explosives, pyrotechnics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.56
H-Index - 65
eISSN - 1521-4087
pISSN - 0721-3115
DOI - 10.1002/1521-4087(200009)25:4<199::aid-prep199>3.0.co;2-w
Subject(s) - ammonium perchlorate , rheology , chemistry , materials science , polymer chemistry , composite number , composite material
Due to the requirements for the preparation of an ammonium perchlorate (AP)/hydroxy‐terminated polybutadiene (HTPB) based composite propellant, an upper limit content of AP applicable in the propellant, φ max (wt%), exists. The rheology of concentrated AP/HTPB suspensions prepared at φ max is investigated in this study. The relative viscosity, η rφ (‐), of the suspensions prepared at φ max is almost constant at approximately 200. For the suspensions prepared at φ max , the HTPB layer thickness, H φp (µm), on the AP particle, calculated from the specific surface area measured by the air‐permeability method, is closely related to the void fraction, ε max (‐), for the loose packing of the AP powder. H φp decreases with increasing ε max . By reversal conclusion it was found that the relative viscosity of the suspension, of which the HTPB layer thickness is H φp , will accordingly be η rφ .