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Related Concept Videos

Thermal Sigmatropic Reactions: Overview01:16

Thermal Sigmatropic Reactions: Overview

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Sigmatropic rearrangements are a class of pericyclic reactions in which a σ bond migrates from one part of a π system to another. These are intramolecular rearrangements where the total number of σ and π bonds remain unchanged.
Sigmatropic shifts are classified based on an order term [i, j ], where i and j indicate the number of atoms across which each end of the σ bond migrates. Below are examples of a [3,3] sigmatropic shift in...
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Enthalpy and Heat of Reaction02:12

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Combustion, commonly known as burning, is a reaction in which a substance reacts with an oxidizing agent, which in most cases is molecular oxygen, to liberate energy in the form of heat, light, or sound. The heat of combustion is also known as the enthalpy of combustion. The energy released when one mole of a substance undergoes complete combustion at constant pressure is called molar heat of combustion. Combustion reactions are exothermic; that is, they release energy, and their ΔH sign...
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Thermochemical Equations02:55

Thermochemical Equations

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For a chemical reaction (the system) carried out at constant pressure – with the only work done caused by expansion or contraction – the enthalpy of reaction (also called the heat of reaction, ΔHrxn) is equal to the heat exchanged with the surroundings (qp).
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Thermal and Photochemical Electrocyclic Reactions: Overview01:26

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Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
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Cycloaddition Reactions: MO Requirements for Thermal Activation01:16

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Thermal cycloadditions are reactions where the source of activation energy needed to initiate the reaction is provided in the form of heat. A typical example of a thermally-allowed cycloaddition is the Diels–Alder reaction, which is a [4 + 2] cycloaddition. In contrast, a [2 + 2] cycloaddition is thermally forbidden.
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Predicting Reaction Outcomes02:24

Predicting Reaction Outcomes

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Kinetics describes the rate and path by which a reaction occurs. In contrast, thermodynamics deals with state functions and describes the properties, behavior, and components of a system. It is not concerned with the path taken by the process and cannot address the rate at which a reaction occurs. Although it does provide information about what can happen during a reaction process, it does not describe the detailed steps of what appears on an atomic or a molecular level. On the other hand,...
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Identification and Quantification of Decomposition Mechanisms in Lithium-Ion Batteries; Input to Heat Flow Simulation for Modeling Thermal Runaway
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A Coupled Thermochemical Model for Predicting Fire-Induced Thermal Responses and Decomposition Behavior.

Bin Wu1,2,3, Wenguo Weng3, Tai Zeng1,2

  • 1The Second Research Institute of CAAC, Chengdu 610041, China.

Polymers
|April 12, 2025
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Summary

This study presents a new fire safety model for aerospace composites. The coupled thermochemical model accurately predicts material behavior under fire, aiding in the development of safer aircraft.

Keywords:
composite materialsfinite elementheat transfermathematical model

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Area of Science:

  • Materials Science
  • Aerospace Engineering
  • Computational Modeling

Background:

  • Composite materials offer high strength-to-weight ratios crucial for aerospace.
  • Fire safety of composites remains a significant challenge in aerospace applications.

Purpose of the Study:

  • To develop a coupled thermochemical model for predicting composite material thermal response and decomposition under fire conditions.
  • To enhance the fire safety of aerospace composites through advanced computational analysis.

Main Methods:

  • Integrated heat transfer, resin pyrolysis kinetics, and gas generation dynamics.
  • Utilized Rule of Mixtures for temperature-dependent thermophysical properties.
  • Employed an n-th-order Arrhenius equation for decomposition kinetics and a hybrid finite element scheme for numerical solution.

Main Results:

  • The model accurately predicts thermal response and decomposition behavior.
  • Successfully captured char layer insulation, heat flux attenuation, and property transitions.
  • Experimental validation confirmed high predictive accuracy according to 14 CFR Part 25 and ISO 2685 standards.

Conclusions:

  • The developed model provides a robust computational framework for fire safety analysis of aerospace composites.
  • Addresses critical gaps in existing models by incorporating coupled multiphysics.
  • Facilitates the optimization of fire-resistant composite materials for aerospace applications.