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Enthalpy of Formation of p(BAMO)‐b‐GAP and Energetic Characteristics of Solid Propellants Based on the Copolymer
Author(s) -
Xu Ruoqian,
Li Zhongming,
Chen Yanhui,
Pei Jiangfeng,
Zhang Junlin
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.202000244
Subject(s) - propellant , oxetane , copolymer , enthalpy , standard enthalpy of formation , materials science , energetic material , thermodynamics , standard enthalpy change of formation , polymer chemistry , chemistry , polymer , organic chemistry , composite material , explosive material , physics
The block copolymer of 3,3’‐bis(azidomethy) oxetane and glycidyl azide polymer (p(BAMO)‐b‐GAP) is an ideal energetic binder for solid propellants. In this work, the enthalpy of formation of p(BAMO)‐b‐GAP was first investigated by the heat of combustion experimental method and group additivity method. Meanwhile, the energetic characteristics of solid propellants based on the copolymer were systematically calculated. The results proved that the Δ f H of p(BAMO)‐b‐GAP could be estimated accurately by two methods and the positive Δ f H values were obtained. Dual‐oxidant formulas were designed in which AP was replaced gradually by some chlorine‐free high‐energy materials. The calculation results showed when AP was gradually replaced by RDX or HMX, the energy level of propellants based on p(BAMO)‐b‐GAP was improved first but then decreased with AP content further decreased, indicating there was an optimum ratio between AP and its alternative. However, when AP was replaced by CL‐20 or ADN, the values of I sp were improved steadily. When less than 40 % AP was replaced, the contribution to the energy level of propellant by RDX or HMX was even more than that by CL‐20.