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1
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Da Cunha BCC, Rocco JAFF. The influence of the type and size of the reactor and the influence of the heating interruption during curing on the solid composite propellant properties. J Appl Polym Sci 2022. [DOI: 10.1002/app.51609] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Bruno Cesar Christo Da Cunha
- Institute of Aeronautics and Space Praça Marechal‐do‐Ar Eduardo Gomes São José dos Campos Brazil
- Division of Fundamental Sciences Aeronautics Institute of Technology, Praça Marechal‐do‐Ar Eduardo Gomes, 50, Vila das Acácias São José dos Campos SP 12228‐904 Brazil
| | - Jose Atilio Fritz Fidel Rocco
- Division of Fundamental Sciences Aeronautics Institute of Technology, Praça Marechal‐do‐Ar Eduardo Gomes, 50, Vila das Acácias São José dos Campos SP 12228‐904 Brazil
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2
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Zhao X, Zhu W. Optimization and design for the curing process of solid azide propellant: Influence of typical components on the curing reactions of
PBT
binders with
TDI. J CHIN CHEM SOC-TAIP 2022. [DOI: 10.1002/jccs.202100510] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Xiao Zhao
- Department of Chemistry Institute for Computation in Molecular and Materials Science, School of Chemistry and Chemical Engineering, Nanjing University of Science and Technology Nanjing China
| | - Weihua Zhu
- Department of Chemistry Institute for Computation in Molecular and Materials Science, School of Chemistry and Chemical Engineering, Nanjing University of Science and Technology Nanjing China
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3
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Selvakumar S, Rao GS, Reddy KA. Diffusion of Labile Chemical Species in HTPB and HTPB‐XT Solid Propellants and Its Effect over Solid Rocket Motor Properties on Aging – A Study. PROPELLANTS EXPLOSIVES PYROTECHNICS 2021. [DOI: 10.1002/prep.202000253] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- S. Selvakumar
- Chemical & Mechanical Testing Labs SPROB Solid Propellant Space Booster Plant SDSC-SHAR Indian Space Research Organization (ISRO) Sriharikota 524124. Andhra Pradesh India
| | - G. Sreenivasa Rao
- Chemical & Mechanical Testing Labs SPROB Solid Propellant Space Booster Plant SDSC-SHAR Indian Space Research Organization (ISRO) Sriharikota 524124. Andhra Pradesh India
| | - K. Audisesha Reddy
- Chemical & Mechanical Testing Labs SPROB Solid Propellant Space Booster Plant SDSC-SHAR Indian Space Research Organization (ISRO) Sriharikota 524124. Andhra Pradesh India
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4
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Gao Y, Lv J, Liu L, Yu Y. Effect of diacylhydrazine as chain extender on microphase separation and performance of energetic polyurethane elastomer. E-POLYMERS 2020. [DOI: 10.1515/epoly-2020-0052] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
AbstractIt is low cost and feasible to improve the mechanical properties of polyurethane by using the chain extender with hydrogen bonding function to improve the degree of microphase separation. In this article, hydrazine hydrate was used to react with ethylene carbonate and propylene carbonate, respectively, to synthesize diacylhydrazines as the polyurethane chain extender with amide bonds, which were characterized by 1H nuclear magnetic resonance. Polyurethane with different contents of hard segment were prepared from poly-3,3-bis(azidomethyl)oxetane-tetrahydrofuran as the polyol and 4,4′-diphenylmethane diisocyanate as the isocyanate components. Fourier transform infrared spectroscopy showed that with the increase of the hard segment content, the proportion of hydrogen-bonded ordered carbonyl group increased to 94%, proving that diacylhydrazines could improve the degree of ordered hydrogen bonding, which led to clear microphase separation observed by field emission scanning electron microscopy and higher storage modulus of the polyurethane. Differential scanning calorimetry and dynamic mechanical analysis showed that polyurethane with higher hard segment content is likely to exhibit multiple thermal transitions caused by microphase separation. When the hard segment content was 40%, compared with polyurethane with 1,4-butanediol as the chain extender, the tensile strengths of polyurethanes with diacylhydrazines also improved by 30% and 76%, respectively.
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Affiliation(s)
- Yang Gao
- State Key Laboratory of Molecular Engineering of Polymers, Department of Macromolecular Science, Fudan University, Shanghai, 200433, China
| | - Jie Lv
- State Key Laboratory of Molecular Engineering of Polymers, Department of Macromolecular Science, Fudan University, Shanghai, 200433, China
| | - Licheng Liu
- State Key Laboratory of Molecular Engineering of Polymers, Department of Macromolecular Science, Fudan University, Shanghai, 200433, China
| | - Yingfeng Yu
- State Key Laboratory of Molecular Engineering of Polymers, Department of Macromolecular Science, Fudan University, Shanghai, 200433, China
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