Synthesis, Characterization, and Evaluation of Antioxidant and Physical Properties of New Bifunctional Aromatic Monomers Containing Imine and Heterocyclic Rings in The Main Chain. DOI Creative Commons
Noor Dia Jaffer

Journal of Kufa for Chemical Sciences, Год журнала: 2023, Номер 3(1), С. 395 - 414

Опубликована: Дек. 10, 2023

New various monomers with di amine functional groups have been synthesized, containing azomethine or seven-membered heterocyclic rings in the backbone. A condensation reaction of benzidine 4-amino benzaldehyde some drops glacial acetic acid ethanol absolute prepared bi-functional amino monomer core P1(4-[(1E)-[4[4-(E)-(4-aminophenyl)methylidene]amino]phenyl}phenylimino methyl aniline). The next step was Cycloaddition P1 succinic, malic, and phthalic anhydrides used to obtain aromatic oxazepane oxazepine lactone lactam groups. All synthesized were characterized spectrally many techniques (FT.IR,1 H1.NMR, C13-NMR) that investigate structure monomers. Monitoring progress completion performed using thin-layer chromatography (TLC). Physical characterizations, including detecting melting point, purity, colour, retardation factor, molecular formula, weight, polarized optical microscope (POM) for Image-based microscopic interpretation compounds. are considered effective antioxidant agents as they give free radicals scavenging over 60%, reaching 80 %; this activity makes them useful large numbers industries can scavenge industrial product may be exposed, which increases its shelf life enhance effectiveness.

Язык: Английский

The relative position of pyrolysis onset and flame front location for downward flame spread DOI Creative Commons

David Morrisset,

Joseph Burnford, Anthony O. Ojo

и другие.

Proceedings of the Combustion Institute, Год журнала: 2024, Номер 40(1-4), С. 105355 - 105355

Опубликована: Янв. 1, 2024

The interaction of solid and gas phase phenomena in downward flame spread is studied under buoyant conditions. Phosphor thermometry (PT) was used to determine the spatiotemporally resolved surface temperatures both ahead beneath while CH* chemiluminescence allowed for quantification location relative fuel surface. combination these measurements superposition front temperature distribution. standoff distance (∼1.1 mm) preheated along (∼3.5 were quantified. application PT continued measurement pyrolyzing region flame, where found remain relatively constant between 300 350 °C. calculation gas-phase heat flux distribution using a point-source approximation, which compared well with previous studies. expand work quantify thermal gradients through behind front. Surface coupled thermogravimetric analysis (TGA) simple pyrolysis model that onset occurs approximately 1 mm This approach also illustrate gases generated sufficient volume result flammable mixture at leading edge flame. study highlights benefit optical diagnostic techniques exploring controlling mechanisms spread, provides insight into spread.

Язык: Английский

Процитировано

5
Assessing the Effect of Oxidizer on Flame Geometry and Effluent Composition from Burning Solids DOI Creative Commons
Jonathan Reep, José L. Torero, Rory M. Hadden

и другие.

Fire Safety Journal, Год журнала: 2025, Номер unknown, С. 104347 - 104347

Опубликована: Янв. 1, 2025

Язык: Английский

Процитировано

0
Application of Sorbent Tube Sampling Coupled with GC-MS for Quantification of Methyl Methacrylate Monomer Yields from Pyrolysis of Poly(Methyl Methacrylate) DOI Creative Commons
Mahsa Lotfi Marchoubeh, Kaylee Morton,

Farnaz Beygi Khosroshahi

и другие.

Journal of Analytical and Applied Pyrolysis, Год журнала: 2025, Номер unknown, С. 107129 - 107129

Опубликована: Апрель 1, 2025

Язык: Английский

Процитировано

0
Identifying the different processes occurring during the steady state charring of solids DOI Open Access
Jonathan Reep, José L. Torero, Michael Spearpoint

и другие.

Journal of Physics Conference Series, Год журнала: 2024, Номер 2885(1), С. 012023 - 012023

Опубликована: Ноя. 1, 2024

Abstract A revised means of controlling the Fire Propagation Apparatus (FPA), enabling a constant mass loss rate (MLR), was used to assess effluent generated during steady state pyrolysis and subsequent charring polyisocyanurate (PIR) phenolic insulation foams. The MLR for each foam set (1 g s −1 m −2 ), with char formation being investigated under three differing oxidative environments (0, 10 20.9 % O 2 ). transition from into identified by increased heat flux supplied FPA lamps whilst maintaining MLR. Species detected in were found be both material process specific; hydrogen cyanide (HCN) prominent PIR effluent, tended favour carbon monoxide (CO) generation. Obtained yields CO HCN showed good correlation wide range tube furnace literature data, an increase yield aligning observation formation. It is shown that environment can impact between combustion processes, thus care must taken when generating representative streams emission sampling.

Язык: Английский

Процитировано

0
Countercurrent flame propagation in a packed bed of spherical PMMA particles: Effect of void structure on flamelets quenching DOI

Shuoshuo Zhou,

Jian Gao, Dongke Zhang

и другие.

Proceedings of the Combustion Institute, Год журнала: 2024, Номер 40(1-4), С. 105565 - 105565

Опубликована: Янв. 1, 2024

Язык: Английский

Процитировано

0
Characteristics of Polyurethane Foam Smoke Particles Formed during Initial Fire Stages DOI

Yejin Ha,

Jung-Hun Noh, Joonho Jeon

и другие.

Fire Science and Engineering, Год журнала: 2024, Номер 38(4), С. 1 - 9

Опубликована: Авг. 29, 2024

When exposed to an external heat source, a solid fuel generates condensed and gaseous phases on its surface through pyrolysis. The pyrolysis products can determine ignition fire development, as well smoke release. Elucidating the process is essential for predicting complex phenomena such flame propagation spread. In this study, thermogravimetric analysis (TGA) optical particle counter (OPC) were used investigate formation based TGA results revealed that polyurethane foam pyrolyzed in two stages then oxidized three stages. OPC confirmed depended presence of source at low temperatures. Additionally, methods are provided account behavior particulate matter during modeling.

Язык: Английский

Процитировано

0
Synthesis, Characterization, and Evaluation of Antioxidant and Physical Properties of New Bifunctional Aromatic Monomers Containing Imine and Heterocyclic Rings in The Main Chain. DOI Creative Commons
Noor Dia Jaffer

Journal of Kufa for Chemical Sciences, Год журнала: 2023, Номер 3(1), С. 395 - 414

Опубликована: Дек. 10, 2023

New various monomers with di amine functional groups have been synthesized, containing azomethine or seven-membered heterocyclic rings in the backbone. A condensation reaction of benzidine 4-amino benzaldehyde some drops glacial acetic acid ethanol absolute prepared bi-functional amino monomer core P1(4-[(1E)-[4[4-(E)-(4-aminophenyl)methylidene]amino]phenyl}phenylimino methyl aniline). The next step was Cycloaddition P1 succinic, malic, and phthalic anhydrides used to obtain aromatic oxazepane oxazepine lactone lactam groups. All synthesized were characterized spectrally many techniques (FT.IR,1 H1.NMR, C13-NMR) that investigate structure monomers. Monitoring progress completion performed using thin-layer chromatography (TLC). Physical characterizations, including detecting melting point, purity, colour, retardation factor, molecular formula, weight, polarized optical microscope (POM) for Image-based microscopic interpretation compounds. are considered effective antioxidant agents as they give free radicals scavenging over 60%, reaching 80 %; this activity makes them useful large numbers industries can scavenge industrial product may be exposed, which increases its shelf life enhance effectiveness.

Язык: Английский

Процитировано

0