New findings on thermal degradation properties of fluoropolymers

Suo-en, Liu; Zhou, Wuyi; Yan, Qi‐Long; Qi, Xiaofei; An, Ting; Pérez‐Maqueda, Luis A.; Zhao, Fengqi

doi:10.1007/s10973-016-5963-z

Cited by 13 publications

(3 citation statements)

References 29 publications

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“…Commonly, several parameters are needed to be evaluated, including decomposition temperature, heat of decomposition, activation energy, pre-exponential factor, reaction model as well as thermolysis chemical pathway [23,45,46]. At present, the behavior of various catalysts as ballistic modifiers in the thermal decomposition of AP-based propellant has been extensively studied [23,[47][48][49].…”

mentioning

confidence: 99%

Thermal behavior and decomposition kinetics of composite solid propellants in the presence of amide burning rate suppressants

Trache

Maggi

Palmucci

et al. 2018

J Therm Anal Calorim

111

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The employment of burning rate suppressants in the solid rocket propellant formulation is long known. Different research activities have been conducted to well understand the mechanism of suppression, but literature about the action of oxamide (OXA) and azodicarbonamide (ADA) on the thermal decomposition of composite propellant is still scarce. The focus of this study is on investigating the effect of burning rate suppressants on the thermal behavior and decomposition kinetics of composite solid propellants. Thermogravimetric analysis (TG) and differential thermal analysis (DTA) have been used to identify the changes in the thermal and kinetic behavior of coolant-based propellants. Two main decomposition stages were observed. It was found that OXA played an inhibition effect on both stages, whereas the ADA acts as a catalyst in the first stage and as coolant in the second one. The activation energy dependent on the conversion rate was estimated by two model-free integral methods: Kissinger-Akahira-Sunose (KAS) and Flynn-Wall-Ozawa (FWO) based on the TG data obtained at different heating rates. The mechanism of action of coolants on the decomposition of solid propellants was confirmed by the kinetic investigation as well.

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mentioning

confidence: 99%

Thermal behavior and decomposition kinetics of composite solid propellants in the presence of amide burning rate suppressants

Trache

Maggi

Palmucci

et al. 2018

J Therm Anal Calorim

111

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“…The third decomposition stage of NaHCO 3 and FSi-NaHCO 3 5 occurs at temperature ranges from 270 to 500 °C in which NaHCO 3 is completely decomposed into Na 2 CO 3 and remains stable, and no substance is decomposed. However, in the third stage, FSi-NaHCO 3 5 still loses weight ranges from 270 to 500 °C, which is mainly due to the degradation of fluorosilane structure generated from the hydrolysis of PFDTES and TEOS. , As seen from Figure d, the maximum decomposition rate of FSi-NaHCO 3 5 under N 2 atmosphere is larger than that of NaHCO 3 , which means that FSi-NaHCO 3 5 can decompose into CO 2 and Na + faster and is conducive to improve its fire-fighting performance. The thermal degradation process of NaHCO 3 and FSi-NaHCO 3 5 under air atmosphere is similar to that of NaHCO 3 and FSi-NaHCO 3 5 under N 2 atmosphere (Figure.S4).…”

Section: Results and Analysismentioning

confidence: 99%

Fluorosilane-Modified Antireflash Sodium Bicarbonate Fire Extinguishing Agent with Advanced Hydrophobic and Oleophobic Properties

Guo

Wang

Zhou

et al. 2022

ACS Appl. Eng. Mater.

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The poor antireflash performance of NaHCO3 dry powder fire extinguishing agent in class B fire is the key problem that restricts its application in large oil fires. In this work, the NaHCO3 was surface modified by sol–gel method to introduce functional fluorosilane structure (named FSi-NaHCO3) and enhance the hydrophobic and oleophobic properties. The water contact angle (WCA) and oil contact angle (OCA) of FSi-NaHCO35 are 147.0° and 144.2°, respectively, which means that FSi-NaHCO35 has advanced hydrophobic and oleophobic properties. The hydrophobic and oleophobic ratio of FSi-NaHCO35 are 92.35% and 91.59%, respectively. Furthermore, FSi-NaHCO35 dry powder fire extinguishing agent can extinguish aviation kerosene and n-heptane oil pool fires in 0.15 and 0.18 s, respectively, which is shorter than that of NaHCO3 dry powder fire extinguishing agent. After the secondary ignition, using FSi-NaHCO35 as dry powder fire extinguishing agent, the fire temperature of the aviation kerosene oil is significantly lower, and the full reburning time of the aviation kerosene oil fire is significantly longer than that of NaHCO3 dry powder fire extinguishing agent, which means FSi-NaHCO35 obviously has antireflash performance in an aviation kerosene oil pool fire.

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“…In recent years, concerns have risen regarding the effect on human health and development caused by high concentrations of these indestructible plastics and their byproducts [11]. More than 4700 organofluorine compounds have been identified; many of them in air, in food and drink, and in the human body [12–23]. Here we examine the potential environmental release of fluorinated species from the destruction of explosives with fluorinated binders.…”

Section: Introductionmentioning

confidence: 99%

Thermal decomposition of fluorinated polymers used in plasticized explosives and munitions

Kominia,

Smith,

Sheehan

et al. 2023

Propellants Explo Pyrotec

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A number of military explosives and munitions employ fluorinated polymers as binders or components, e. g., PBXN‐5. To determine potential environmental releases during disposal operations, the thermal decomposition of the fluorinated polymers Viton A, Kel‐F, and Teflon were examined alone and in combination with the explosive HMX. Although PBXN‐5 only contains 5 % by weight Viton A, laboratory prepared analogs were made with 5 % polymer as well as with 50 % polymer to ensure polymer decomposition products could be detected. Under air and under nitrogen decomposition was examined by SDT [simultaneous differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA)], TGA‐infrared (IR) spectrometry, and pyrolysis gas chromatography with mass spectrometric analysis (GC‐MS). All three techniques, SDT, TGA‐IR, and pyrolysis GC‐MS, suggest that decomposition of HMX could be completed at low temperature before polymer decomposition ensues. To confirm this observation, pyrolysis GC‐MS was performed at temperatures below 350 °C since above this temperature all three polymers exhibited some fluorinated decomposition products.

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New findings on thermal degradation properties of fluoropolymers

Cited by 13 publications

References 29 publications

Thermal behavior and decomposition kinetics of composite solid propellants in the presence of amide burning rate suppressants

Thermal behavior and decomposition kinetics of composite solid propellants in the presence of amide burning rate suppressants

Fluorosilane-Modified Antireflash Sodium Bicarbonate Fire Extinguishing Agent with Advanced Hydrophobic and Oleophobic Properties

Thermal decomposition of fluorinated polymers used in plasticized explosives and munitions

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