Thermal decomposition behavior of a thermal protection coating composite with silicone rubber: Experiment and modeling

High-Temperature Stability and Pyrolysis Kinetics and Mechanism of Bio-Based and Petro-Based Resins Using TG–FTIR/MS

“…For C9PR and RGE, variations in E α are not significant because the difference between maximum and minimum activation energies is less than 20% of the mean of E α value. , However, for HC9PR and HRGE, large fluctuations of E α occur at α = 0.1 due to the release of more moisture and low-volatile matters, but there are no significant variations in E α at α = 0.2–0.9. Considering the complexity and uniqueness of bio-based and petro-based resins, the pyrolysis reactions of RGE, HRGE, C9PR, and HC9PR in a nitrogen atmosphere could be regarded as a multistep reaction whose rate is controlled or limited by one of these steps, and similar results have been reported in previous work. ,, …”

“…Noticeably, both RGE and C9PR have only one dominating pyrolysis stage, between 500 and 800 K, accompanied by the cracking of branching chains and the ring-opening reaction of cyclic compounds, and the reaction-order model is found to be the most probable reaction mechanism for pyrolysis of various resins. Results from TG–FTIR/MS analyses show that it is more difficult to crack the bio-based resin into phenyl than the petroleum-based resin, clearly revealing that the tricyclic phenanthrene structures in the bio-based resins are highly thermally stable and require higher pyrolysis temperatures than the cycloaliphatic and aromatic rings in the petro-based resins, and similar results have been reported. , Before starting pyrolysis, a small amount of compounds is released due to the evaporation of moisture and the cracking of weak chemical bonds, which may reduce the fitting quality of the kinetic model. , Among them, the cracking of weak chemical bonds of RGE and HRGE consists of the decarboxylation reaction and the cracking of methyl and isopropyl, with concomitant formation of CO, CO 2 , CH 3 OH, ethane, propane, CH 4 , and isopropanol, which is well supported by the results of TG–FTIR/MS analyses. Similarly, the branching chains of C9PR and HC9PR are cracked first to form straight-chain alkanes and olefins, such as ethane, propane, ethene and propylene.…”

Evaluation method and key factor analysis for thermal protection performance of multifunctional integrated ablative materials

“…17 The pyrolysis kinetic model was developed for investigating the pyrolysis behavior of the silicone rubber matrix coating composite with experimental validation. 18 The material responses including temperature rising, pyrolysis, and coking of lightweight carbon/ phenolic ablators were presented by using a twodimensional finite element model. 19 The above studies have adopted a large number of simplified assumptions, such as, ignoring the flow and heat transfer of the gas generated by the pyrolysis of matrix in the material, without considering the pore changes accompanying the heating process of material, and regarding the multiphase system composed of porous solid char formed by decomposition, pyrolysis gases and fiber skeleton as an equivalent medium.…”

The thermomechanical response of a poroelastic medium with two thermal relaxation times

“…Many researchers (Abbas, 2014c;Sarkar and Mondal, 2019;Othman and Mondal, 2019;Abbas and Youssef, 2009;Othman and Abbas, 2011;Sharma et al, 2015;Sur and Kanoria, 2014) presented the solutions of several problems under generalized thermoelastic theories and (Zeeshan et al, 2019;Sheikholeslami et al, 2019;Marin et al, 2019;Ellahi et al, 2019;Shirvan et al, 2017a, b) used several methods to get the solutions of various problems for porous media with several boundary conditions. Shi et al (2020a, b) studied the thermal decomposition behaviors of a thermal protection coating composite with silicone rubbers with modeling and experiment. Shi et al (2020a, b) have investigated the coupled ablations and thermal behaviors of an allcomposite structurally integrated thermal protections system with modeling and fabrications.…”

“…Shi et al (2020a, b) studied the thermal decomposition behaviors of a thermal protection coating composite with silicone rubbers with modeling and experiment. Shi et al (2020a, b) have investigated the coupled ablations and thermal behaviors of an allcomposite structurally integrated thermal protections system with modeling and fabrications. Wei et al (2020) have presented Green's function of Lord and Shulman's porothermoelasticity theory.…”