Study on thermal stability of typical carbon fiber epoxy composites after airworthiness fire protection test

Abstract

The thermal stability of the T700 carbon fiber epoxy composites, which had been tested under different conditions (nonvibration plus nonscrubbing airflow, vibration, scrubbing airflow, and vibration plus scrubbing airflow), were investigated according to the obtained weight loss behavior, integral program decomposition temperature (IPDF), and activation energies (E) by using thermogravietry-differential thermal analyzer. The results indicate that the weight loss ratio, IPDF, and E of T700 carbon fiber epoxy and its residues in the third and fourth layers are similar under the nonvibration plus nonscrubbing airflow and vibration, and the thermal stability under the vibration condition is slightly stronger. In addition, the weight loss ratio, IPDF, and E of the epoxy and its residues in materials are also similar under scrubbing airflow and vibration plus scrubbing airflow, and the thermal stability under vibration plus scrubbing airflow is better. However, it is significantly less than the thermal stability of materials under nonvibration plus nonscrubbing airflow and vibration. Therefore, it can be found that the vibration exacerbates the flame severity and the scrubbing airflow has a significant cooling effect on the material during the airworthiness fire protection test, which have guiding significance on the airworthiness fire prevention items formulation of carbon fiber composite. K E Y W O R D Sactivation energies, carbon fiber epoxy, integral program decomposition temperature, weight loss ratio

Fabrication and characterization of flame‐retardant and smoke‐suppressant of flexible polyurethane foam with modified hydrotalcite

“…This is because the addition of dihydrogen phosphate intercalation LDH promotes the carbonization reaction. These research results show that the intercalation of dihydrogen phosphate LDH can significantly inhibit the combustion of FPUF, slow down the spread of the fire, and gain more survival time for the victims of fire [16][17][18]. From Table2, it can see that the PHRR of the modified FPUF is 37.2 kW/m 2 when the heat radiation intensity is 25 kW/m 2 , the PHRR of the modified FPUF is 35.7 kW/m 2 when the heat radiation intensity is 35 kW/m 2 , and the PHRR of the modified FPUF reaches 65.2 kW/m 2 under the radiation intensity of 50 kW/m 2 .…”

Synergy between manganese phytate and expandable graphite on thermal stability and combustion behavior of rigid polyurethane foam

“…So the calculation formula is expressed as Equation (2) where G ( α ) is the integral form of h ( α ) 26 . lg β −1/ T were fitted to get the slope based on three heating rates (5, 20, and 40°C/min), and then calculating the activation energy ( E ) to analyze the stability of PUFs 27 …”

“…26 lgβ À1/T were fitted to get the slope based on three heating rates (5, 20, and 40 C/min), and then calculating the activation energy (E) to analyze the stability of PUFs. 27 The pyrolysis curves were fitted by the Flynn-Wall-Ozawa method, which were shown in Figure 5. The pyrolysis kinetic parameters of the two MEPUFs at different conversion rates calculated by the Flynn-Wall-Ozawa method were shown in Table 3.…”

Use of montmorillonite to improve flame retardancy, thermal stability and reducing smoke toxicity of chicken feather protein‐based rigid polyurethane foam

“…The heating rate is defined as β = dT / dt (K/min) 23 . lgβ−1/T were fitted to get the slope based on four heating rates (5, 10, 20, and 40°C/min), and then calculating E to analyze the stability of the modified RPUFs 24 …”

“…23 lgβÀ1/T were fitted to get the slope based on four heating rates (5, 10, 20, and 40 C/min), and then calculating E to analyze the stability of the modified RPUFs. 24 The pyrolysis kinetic parameters of 5 types of RPUFs at different conversion rates using the Flynn-Wall-Ozawa method are shown in Table 3. As can be seen from Table 3, E of the modified RPUFs was approximately the same at the beginning of the reaction when the conversion rate was low.…”