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Rheological Characterization of Metalized and Non‐Metalized Ethanol Gel Propellants
Author(s) -
Jyoti Botchu. V. S.,
Baek Seung Wook
Publication year - 2014
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/prep.201400085
Subject(s) - thixotropy , rheology , viscoelasticity , materials science , viscosity , apparent viscosity , shear rate , composite material , particle size , ethanol , chemical engineering , chemistry , organic chemistry , engineering
The gellation of metalized and non‐metalized ethanol with a methylcellulose gelling agent and its effect on the rheological properties (flow and dynamic study) of these gels is reported herein. The rheological study shows that increasing the shear rate reduces the apparent viscosity for a given yield stress (for a shear rate range of 1 to 12 s −1 ) for both shear rate ranges (1 to 12 and 1 to 1000 s −1 ) covered in present experiment. The gellant and metal particle concentrations significantly influence the gel apparent viscosity. Distinct changes in thixotropic behavior were observed, while decreasing the concentration of MC gellant and Al metal particles in the ethanol gels. The dynamic study showed that all of the linear viscoelastic regions (LVE) of the gel samples were independent of strain percentage (1 to 10). The G′ values depended on the frequency and exceeded the G′′ values, which indicated a gel‐like highly structured material. The tan δ values showed that all of the ethanol gels were elastic and weak physical gels with a high degree of cross‐linking.