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Journal of Thermal Analysis and Calorimetry

, Volume 124, Issue 1, pp 107–115 | Cite as

Properties and application of a novel type of glycidyl azide polymer modified double-base spherical powders

  • Yanguang Wu
  • Zhen Ge
  • Yunjun Luo
Article

Abstract

GAP modified double-base powder was prepared by an internal solution method and applied in cross-linked modified double-base propellants. It was found that if GAP content was not more than 30 %, the modified double-base powders had high roundness rate, no bonding between the particles and excellent fluidity. The median diameter (d 50) of powders was decreased from 90.24 to 72.41 μm when the amount of GAP increased from 0.0 to 30.0 %. The thermal decomposition peak temperatures of –N3 and GAP’s main chain were found to be lower for the 10.0, 20.0 and 30.0 % GAP modified powders than the corresponding peak temperatures for pure GAP. The drop mass impact sensitivity of the modified powders is reduced as the mass ratio of GAP increases. It was experimentally shown that GAP modified double-base powders can improve the mechanical characteristics of the propellant with a maximum tensile strength (σ m) between 0.45 MPa < σ m < 1.18 MPa and an elongation at maximum tensile strength (ε m) between 29.80 % < ε m < 52.60 % at temperatures of −40, +20 and +50 °C.

Keywords

Glycidyl azide polymer (GAP) GAP modified double-base powders Particle size distribution Thermal decomposition Mechanical properties 

Abbreviations

d50

Median diameter (μm)

σm

Maximum tensile strength (MPa)

εm

Elongation at maximum tensile strength (%)

DTG

Differential thermogravimetry

DINA

Dinitroxyethylnitramine

GAP

Glycidyl azide polymer

XLDB

Cross-linked modified double-base

P(EO-THF)

Copolyether of ethylene oxide and tetrahydrofuran

NC

Nitrocellulose

NG

Nitroglycerin

RDX

Cyclotrimethylenetrinitramine

CARBON

Carbon black

N100

Triisocyanate

TPB

Triphenylbismuthine

C2

Centralite II

SEM

Scanning electron microscopy

TG

Thermal gravimetric analysis

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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2015

Authors and Affiliations

  1. 1.School of Materials Science and EngineeringBeijing Institute of TechnologyBeijingPeople’s Republic of China
  2. 2.School of Materials Science and EngineeringWuhan Institute of TechnologyWuhanPeople’s Republic of China

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