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Mechanical Properties and Thermal Decomposition Behaviors of Hydroxyl‐Terminated Polybutadiene/Glycerol Propoxylate Blend and Its Application to Ammonium Nitrate‐Based Propellants
Author(s) -
Kohga Makoto,
Togashi Ryoto
Publication year - 2021
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.202000295
Subject(s) - propellant , polybutadiene , materials science , thermal decomposition , plasticizer , hydroxyl terminated polybutadiene , ammonium perchlorate , composite material , chemical engineering , decomposition , polymer chemistry , copolymer , composite number , organic chemistry , chemistry , polymer , engineering
Hydroxyl‐terminated polybutadiene (HTPB) is commonly used as a binder ingredient in composite propellants. In this study, a plasticizer was added to the binder to promote its plasticity and flexibility. Glycerol propoxylate (GPO) is a triol material with a zigzag structure, and it has one oxygen atom in a repeating unit. GPO would be a good plasticizer for HTPB binder to obtain good elasticity; furthermore, it would be suitable for improving the burning characteristics of the HTPB propellant. The addition of GPO to the HTPB binder was effective in extending the pot life and improving the mechanical properties of the propellant. The thermal decomposition behaviors of the HTPB/GPO blends were almost the same as that of the HTPB binder, except that the beginning consumption temperature of the blends was lower than that of HTPB. The ignitability at low pressure for the ammonium nitrate‐based propellant was improved by using the HTPB/GPO binder, whereas GPO did not enhance the burning rate of the propellant.