scholarly journals Study on the Thermal Stability and Decomposition Kinetics of Polypropylene Glycol - Glycidyl Azide Polymer - Polypropylene Glycol (PPG-GAP-PPG) as a Novel Triblock Copolymer Binder

2020 ◽  
Vol 17 (2) ◽  
pp. 262-279
Author(s):  
Fahimeh Ghoroghchian ◽  
Yadollah Bayat ◽  
Fatemeh Abrishami
Keyword(s):  
Thermal Stability ◽  
Triblock Copolymer ◽  
Decomposition Kinetics ◽  
Polypropylene Glycol ◽  
Glycidyl Azide Polymer ◽  
Kinetics Of ◽  
Glycidyl Azide

Compatibility of energetic plasticizers with the triblock copolymer of polypropylene glycol-glycidyl azide polymer-polypropylene glycol (PPG-GAP-PPG)

2020 ◽  
Vol 40 (10) ◽  
pp. 797-805
Author(s):  
Fahimeh Ghoroghchian ◽  
Yadollah Bayat ◽  
Fatemeh Abrishami
Keyword(s):  
Mechanical Properties ◽  
Triblock Copolymer ◽  
Polypropylene Glycol ◽  
Scanning Calorimetry ◽  
Glycidyl Azide Polymer ◽  
Sem Images ◽  
Rheological Analysis ◽  
Vacuum Stability Test ◽  
Energetic Plasticizers ◽  
Glycidyl Azide

AbstractGlycidyl azide polymer (GAP) is well known as an energetic prepolymer, but its application as a binder in propellants is limited due to its relatively high glass transition temperature and relatively poor mechanical properties. Copolymerization of GAP with polypropylene glycol (PPG) has been shown to improve GAPs properties because of the good thermal and mechanical properties of PPG. In this research we synthesized triblock copolymer of PPG-GAP-PPG and the compatibilities of this copolymer were investigated with energetic plasticizers (20% w/w) n-butyl nitroxyethylnitramine (BuNENA), trimethylolethane trinitrate (TMETN), and butanetriol trinitrate (BTTN) by solubility parameter, differential scanning calorimetry (DSC), rheological analysis, scanning electron microscopy (SEM) and vacuum stability test (VST). The DSC results showed that BuNENA had better compatibility with the triblock copolymer in comparison to TMETN and BTTN. It reduced the Tg of PPG-GAP-PPG from −58 to −63 °C. The rheological analysis was in good agreement with the DSC results obtained for the compatibility of the plasticizers. In the case of the addition of 20% w/w BuNENA, the viscosity of copolymer/plasticizer decreased from 550 to 128 mPa s, indicating appropriate compatibility of plasticizer with the copolymer. SEM images showed a better distribution of BuNENA in the copolymer matrix.

scholarly journals Thermal Stability and Decomposition Kinetics of 1-Alkyl-2,3-Dimethylimidazolium Nitrate Ionic Liquids: TGA and DFT Study

Materials ◽  
2021 ◽  
Vol 14 (10) ◽  
pp. 2560
Author(s):  
Jianwen Meng ◽  
Yong Pan ◽  
Fan Yang ◽  
Yanjun Wang ◽  
Zhongyu Zheng ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Density Functional Theory ◽  
Ionic Liquids ◽  
Density Functional ◽  
Density Functional Theory Calculations ◽  
Nitrogen Atmosphere ◽  
Decomposition Kinetics ◽  
Heating Rates ◽  
Functional Theory ◽  
Kinetics Of

The thermal stability and decomposition kinetics analysis of 1-alkyl-2,3-dimethylimidazole nitrate ionic liquids with different alkyl chains (ethyl, butyl, hexyl, octyl and decyl) were investigated by using isothermal and nonisothermal thermogravimetric analysis combined with thermoanalytical kinetics calculations (Kissinger, Friedman and Flynn-Wall-Ozawa) and density functional theory (DFT) calculations. Isothermal experiments were performed in a nitrogen atmosphere at 240, 250, 260 and 270 °C. In addition, the nonisothermal experiments were carried out in nitrogen and air atmospheres from 30 to 600 °C with heating rates of 5, 10, 15, 20 and 25 °C/min. The results of two heating modes, three activation energy calculations and density functional theory calculations consistently showed that the thermal stability of 1-alkyl-2,3-dimethylimidazolium nitrate ionic liquids decreases with the increasing length of the alkyl chain of the substituent on the cation, and then the thermal hazard increases. This study could provide some guidance for the safety design and use of imidazolium nitrate ionic liquids for engineering.

The thermal stability and non-isothermal decomposition kinetics of a zinc ferrite precursor

1993 ◽  
Vol 228 ◽  
pp. 249-259 ◽  
Author(s):  
Oana Carp ◽  
E. Segal ◽  
Lummiţa Patron ◽  
Ruxandra Birjega ◽  
C. Craiu ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Zinc Ferrite ◽  
Decomposition Kinetics ◽  
Isothermal Decomposition ◽  
Kinetics Of

Thermal stability and decomposition kinetics of NdNiO3-δ at 1 bar of O2

2021 ◽  
pp. 102663
Author(s):  
A.A. Bassou ◽  
P.J. Machado ◽  
M.M. Gomes ◽  
B. Manjunath ◽  
R. Vilarinho ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Decomposition Kinetics ◽  
Kinetics Of

Thermal Stability and Decomposition Kinetics of 1,3-Dimethyladamantane

2014 ◽  
Vol 28 (10) ◽  
pp. 6210-6220 ◽  
Author(s):  
Xiaomei Qin ◽  
Lei Yue ◽  
Jianzhou Wu ◽  
Yongsheng Guo ◽  
Li Xu ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Decomposition Kinetics ◽  
Kinetics Of
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