Azidation of Polyvinyl Nitrate and Energy Related Studies

Mishra, Supriya; Pant, Jyotsna; Dutta, Pushan Kumar; Durgapal, U. C.

doi:10.14429/dsj.47.3985

Cited by 3 publications

(1 citation statement)

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“…The enthalpy of azide decomposition for the copolymer with the highest azide content in the series, 6g, is -1.2 kJ/g, as measured by DSC. Two other azide-containing materials, GAP 6 and poly(vinyl nitrate) partially substituted with azide (PVAZ), 48 have reported enthalpies of -1.8 and -2.7 kJ/g, respectively. The higher enthalpies for these two polymers are due to the higher azide content incorporated in the structures.…”

Section: Discussionmentioning

confidence: 99%

Synthesis and Characterization of Poly[(1-trimethylsilyl-1-propyne)-co-(1-(4-azidobutyldimethylsilyl)-1-propyne)] Copolymers

2000

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Poly(trimethylsilylpropyne) copolymers with bromobutyl side chains were synthesized from 1-trimethylsilyl-1-propyne and 1-(4-bromobutyldimethylsilyl)-1-propyne using a TaCl5/Ph3Bi catalyst system in toluene. After polymerization, azide groups were introduced into the polymers by phase transfer catalysis to yield polyResults from thermal analyses, elemental analyses, and IR spectroscopy confirm that the azide content in the copolymers matches the original comonomer feed ratios. Films of the copolymers were thermally cross-linked in vacuo, with the rate of azide decomposition monitored by the loss of the azide absorption band in the IR. For a copolymer with 15 mol % azide content, an activation energy of 130 kJ/mol was calculated from IR data collected over the azide decomposition temperature range. For the copolymer with the highest azide content (20 mol %), DSC measurements give -1.2 kJ/g for the enthalpy of azide decomposition. Swelling experiments performed on the cross-linked films indicate that a relatively low cross-link density (∼5%) is required to render membranes dimensionally stable in good solvents for the polymer.

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Section: Discussionmentioning

confidence: 99%

Synthesis and Characterization of Poly[(1-trimethylsilyl-1-propyne)-co-(1-(4-azidobutyldimethylsilyl)-1-propyne)] Copolymers

2000

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The synthesis and characterization of polyvinyl nitrate as an energetic polymer and study of its thermal behavior

Kazemi

Hayaty

Mousaviazar

et al. 2014

J Therm Anal Calorim

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Application of processing maps and numerical modelling for identification of parameters and limitations of hot forging process of 80MnSi8-6 steel

Wojtaszek,

Lisiecki,

Łukaszek-Sołek

et al. 2023

Archiv.Civ.Mech.Eng

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The processing maps developed by dynamic material modelling (DMM) method are now widely used in the design of hot forming processes. However, this applies to those processes that are relatively fast or are carried out under isothermal conditions, when it is possible to maintain the deformation parameters within the processing window. In the case of multi-stage free forging, the temperature successively decreases during subsequent operations and is increased during inter-process reheating. Under such conditions, processing maps in direct form are not applicable. The proposed solution is to implement the data obtained by the DMM method into calculations carried out by the finite element method (FEM). This approach leads to obtain the distributions of DMM parameters in the volume of the feedstock at successive forging stages. Selected results of a combined DMM/FEM analysis of a multi-stage hot forging process of 80MnSi8-6 steel are presented. The starting data for the analysis were the flow curves of this material, determined from compression tests. The processing maps were developed and processing windows were determined. The results of the DMM analysis were verified by microstructure observations. Data from the DMM analysis were implemented into QForm software using LUA scripts. An integrated FEM/DMM numerical analysis of the process of a multi-step hot free forging of an example product was performed. The geometry of the tools and a sequence of operations were developed. The distributions of the DMM parameters and the hot deformation activation energy in the forging volume after successive forging sequences were analyzed.

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Azidation of Polyvinyl Nitrate and Energy Related Studies

Cited by 3 publications

References 0 publications

Synthesis and Characterization of Poly[(1-trimethylsilyl-1-propyne)-co-(1-(4-azidobutyldimethylsilyl)-1-propyne)] Copolymers

Synthesis and Characterization of Poly[(1-trimethylsilyl-1-propyne)-co-(1-(4-azidobutyldimethylsilyl)-1-propyne)] Copolymers

The synthesis and characterization of polyvinyl nitrate as an energetic polymer and study of its thermal behavior

Application of processing maps and numerical modelling for identification of parameters and limitations of hot forging process of 80MnSi8-6 steel

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