Investigation on the thermal decomposition of the elastomer containing fluoroolefin segment by DSC‐TG‐MS‐FTIR

Abstract

Based on the cross-linking reaction of bisphenol A epoxy resin and liquid carboxyterminated poly(tetrafluoroethylene-hexafluoropropylene-vinylidene fluoride) copolymer (CTTHV), the elastomer containing fluoroolefin segment was prepared. The bis (2,2-dinitropropyl)-acetal/formal (BDNPA/F) was used as an energetic plasticizer for this fluoroolefin segment-containing elastomer (FO elastomer). The compatibility of CTTHV and BDNPA/F was evaluated by the combination of differential scanning calorimetry (DSC) and derivative thermogravimetry (DTG) methods. Thermal decomposition of the FO elastomers was investigated by TG-DSC. The kinetic parameters of the FO elastomers were calculated by Kissinger-Akahira-Sunose method. DSC-TG-MS-Fourier transform infrared spectroscopy analysis was used to detect the thermal decomposition products. The thermal decomposition mechanisms of the FO and FO/BDNPA/F elastomers were discussed. The results show that CTTHV has a good compatibility with BDNPA/F, and the prepared FO/BDNPA/F elastomers have good thermal stability. BDNPA/F can promote the thermal decomposition of the FO elastomer and bring more heat for the binder system according to the thermal decomposition behaviors and kinetic calculation results of FO/BDNPA/F elastomers. The FO elastomer preferentially undergoes depolymerization, HF elimination with the formation of polyene sequences, and subsequent main-chain cleavage, polyaromatization. The H ion fragments of the decomposition of BDNPA/F can be an important factor in the improvement of HF concentration at the initial thermal decomposition of FO elastomer. An abundant HF released during all decomposition of FO/BDNPA/F elastomers may be beneficial to the ignition and combustion of aluminum particles in future applications.

Thermal decomposition of fluorinated polymers used in plasticized explosives and munitions

“…Other species were observed but not definitively identified. Table 3 is limited to those species previously report under helium pyrolysis [38][39][40][41][42][43][44][45][46][47]. Kel-F was somewhat more liable than Viton A (Figure 9).…”

“…PTFE is often found in contact with explosives, although it is not used as a binder. At high temperatures, such as 700 °C, tetrafluoroethylene and hexafluoropropylene were produced [42,[44][45][46][47]. The broad peak at ~2 to 2.5 is identified as tetrafluorosilane.…”

Influence of Fluorinated Polyurethane Binder on the Agglomeration Behaviors of Aluminized Propellants

“…The FPU was subsequently used as a binder in the aluminized propellant for the purpose of improving agglomeration. FTIR, 1 H NMR and mechanical tests were used to analyze the structural and mechanical properties of FPU. DSC−TG−MS, SEM, EDS and high-speed photography were used to analyze the role of FPU loading with respect to decomposition behavior and combustion performance.…”

“…Polyurethane binder is an important component of composite solid propellants, which function as a matrix to provide dimensional stability for filler particles [ 1 , 2 ]. The evolution of composite solid propellant energy performance is usually accompanied by the innovation of the binder system.…”

On-Line Thermally Induced Evolved Gas Analysis: An Update—Part 1: EGA-MS

“…Based on the cross-linking reaction of bisphenol A epoxy resin and liquid carboxy-terminated poly(tetrafluoroethylene-hexafluoropropylene-vinylidene fluoride) copolymer, an elastomer containing fluoroolefin segment was prepared by Tang and coworkers. Coupled MS-FTIR evolved gas analysis was used to detect the thermal decomposition products and to discuss the thermal decomposition mechanisms [ 23 ].…”