scholarly journals Combustion properties and thermal decomposition kinetics of flame retardant silk fabrics treated by phytic acid and silica sols

2018 ◽  
Vol 22 (4) ◽  
pp. 1665-1671 ◽  
Author(s):  
Yun-Bo Chen ◽  
Chun Liu ◽  
Shao-Li Zhang ◽  
Guo-Qiang Chen ◽  
Tie-Ling Xing
Keyword(s):  
Thermal Decomposition ◽  
Flame Retardant ◽  
Phytic Acid ◽  
Kinetics Model ◽  
Combustion Properties ◽  
Before And After ◽  
Combustion Experiment ◽  
Silk Fabrics ◽  
Silica Sols ◽  
Kinetics Of

In order to obtain the flame retardant silk fabric, silica sols and phytic acid were prepared and applied to the silk fabrics. Vertical combustion experiment, thermogravimetric analysis, Fourier transform infrared spectra and smoke density test were used to investigate the combustion behavior, thermal property, and kinetics model of silk fabrics before and after flame retardant finish. The results showed that the sol coating on silk fabrics could increase the carbon residue and hinder the spread of flame when burning, and the tensile strength of treated silk was slightly damaged. Furthermore, the kinetics model of silk thermal decomposition conformed to Avrami-Erofeev model.

Thermal Decomposition Kinetics of Flame Retardant Polybutylene Terephthalate Matrix Composites

2019 ◽  
Vol 956 ◽  
pp. 181-191
Author(s):  
Jian Lin Xu ◽  
Bing Xue Ma ◽  
Cheng Hu Kang ◽  
Cheng Cheng Xu ◽  
Zhou Chen ◽  
...  
Keyword(s):  
Activation Energy ◽  
Thermal Decomposition ◽  
Flame Retardant ◽  
Mass Loss Rate ◽  
Decomposition Reaction ◽  
Decomposition Kinetics ◽  
Thermal Decomposition Kinetics ◽  
Heating Rates ◽  
Polybutylene Terephthalate ◽  
Kinetics Of

The thermal decomposition kinetics of polybutylene terephthalate (PBT) and flame-retardant PBT (FR-PBT) were investigated by thermogravimetric analysis at various heating rates. The kinetic parameters were determined by using Kissinger, Flynn-Wall-Ozawa and Friedman methods. The y (α) and z (α) master plots were used to identify the thermal decomposition model. The results show that the rate of residual carbon of FR-PBT is higher than that of PBT and the maximum mass loss rate of FR-PBT is lower than that of PBT. The values of activation energy of PBT (208.71 kJ/mol) and FR-PBT (244.78 kJ/mol) calculated by Kissinger method were higher than those of PBT (PBT: 195.54 kJ/mol) and FR-PBT (FR-PBT: 196.00 kJ/mol) calculated by Flynn-Wall-Ozawa method and those of PBT and FR-PBT (PBT: 199.10 kJ/mol, FR-PBT: 206.03 kJ/mol) calculated by Friedman methods. There is a common thing that the values of activation energy of FR-PBT are higher than that of PBT in different methods. The thermal decomposition reaction models of the PBT and FR-PBT can be described by Avarami-Erofeyev model (A1).

Combustion properties and pyrolysis kinetics of flame-retardant polyurethane elastomers

2016 ◽  
Vol 30 (2) ◽  
pp. 255-272 ◽  
Author(s):  
Xilei Chen ◽  
Lili Huo ◽  
Jianbo Liu ◽  
Chuanmei Jiao ◽  
Shaoxiang Li ◽  
...  
Keyword(s):  
Heat Release ◽  
Flame Retardant ◽  
Pyrolysis Kinetics ◽  
Cone Calorimetry ◽  
Polyurethane Elastomers ◽  
Conversion Rates ◽  
Combustion Properties ◽  
Peak Heat Release Rate ◽  
Fwo Method ◽  
Kinetics Of

Flame-retardant polyurethane elastomers (PUEs) have been prepared using trichloroethyl phosphate (TCEP) as flame retardant. The combustion performances and thermal decomposition properties of PUEs were studied using cone calorimetry test and thermogravimetric analysis, respectively. Kissinger method and Flynn–Wall–Ozawa (FWO) method were adopted to discuss the pyrolysis kinetics of PUEs. The experimental results showed that TCEP has good flame-retardant effect for PUE. With the increase of TCEP, the peak heat release rate and total heat release values decrease. A good diagram of linear regression can be obtained from both Kissinger and FWO methods. The activation energy values of flam- retardant PUE can be calculated from FWO method at different conversion rates.

Kinetics on the Isothermal Decomposition of Oil Shale

2012 ◽  
Vol 581-582 ◽  
pp. 112-116 ◽  
Author(s):  
Hua Qing Xue ◽  
Hong Yan Wang ◽  
Gang Yan ◽  
Wei Guo ◽  
Xiao Bo Li ◽  
...  
Keyword(s):  
Thermal Decomposition ◽  
Oil Shale ◽  
Kinetics Model ◽  
Isothermal Kinetics ◽  
Temperature Error ◽  
Isothermal Decomposition ◽  
Oil Shale Pyrolysis ◽  
Two Stages ◽  
Kinetics Of ◽  
Rapid Conversion

The kinetics of the thermal decomposition of Huadian oil shale was studied at five different isothermal atmospheres of 623K, 648K, 673K, 698K, and 723K. The temperature recorded was that of the sample that the temperature error between furnace and sample will eliminate. According to conversion data, the effect of increased temperature is to decrease the pyrolysis time. The conversion data described the oil shale pyrolysis as two stages, rapid conversion and modest conversion. The Arrhenius equations of ki=1.40×105e-109828/RT and kii=1.76×106e-130463/RT were obtain by isothermal kinetics model for each stage.

Migration Characteristics and Degradation Kinetics of Bisphenol A

2016 ◽  
Vol 850 ◽  
pp. 128-136
Author(s):  
Zhuo Jun Sun ◽  
Jian Gao ◽  
Hui Liu ◽  
Shu Zhen Pan ◽  
Shu Li Zhang ◽  
...  
Keyword(s):  
Thermal Decomposition ◽  
Bisphenol A ◽  
Aging Time ◽  
Degradation Kinetics ◽  
Heat Stability ◽  
Gas Chromatography Mass Spectrometry ◽  
Oxidative Aging ◽  
Before And After ◽  
Thermal Oxidative Aging ◽  
Kinetics Of

This paper study the migration characteristics and degradation kinetics of bisphenol A using TGA - gas chromatography - mass spectrometry and found that bisphenol A polycarbonate in the thermal oxidative aging conditions of 130 °C de-gradated to bisphenol A. At the range of 0 h to 120 h, the bisphenol A content of environmental hormones increased with time. When it reached 120 h, bisphenol A environmental hormone content decreased slightly with aging time. The content of bisphenol A reached 495mg/kg when the thermal oxidative aging time was 168 h, which was decreased compared to the content of 442mg/kg at 120 h. Polycarbonate thermal decomposition kinetics study showed that the thermal decomposition of polycarbonate can be divided into three phases. The first thermal decomposition occurred at the range of 415° C to 425 ° C, the polycarbonate end groups fracture of the second stage at 493.6°C , the main fracture of the main chain rearrangement and crosslinking, and the third stage at 598.7°C, the degradation of the chain continues to decompose and the decomposition of the crosslinked carbon precursor; thermal oxidation aging of polycarbonate decreased the heat stability and promote the thermal decomposition of polycarbonate. Comparing the oxidation induction period, thermal weight loss rate and activation energy of polycarbonate before and after thermal oxidative aging, it c found that the thermal stability of the hot oxygen aging of polycarbonate is reduced.

scholarly journals Understanding thermal decomposition kinetics of flame-retardant thermoset polylactic acid

RSC Advances ◽  
2019 ◽  
Vol 9 (6) ◽  
pp. 3128-3139 ◽  
Author(s):  
Yihan Li ◽  
Zhe Qiang ◽  
Xie Chen ◽  
Jie Ren
Keyword(s):  
Activation Energy ◽  
Thermal Decomposition ◽  
Thermal Degradation ◽  
Flame Retardant ◽  
Polylactic Acid ◽  
Decomposition Kinetics ◽  
Ozawa Method ◽  
Local Activation ◽  
Local Activation Energy ◽  
Kinetics Of

The Flynn–Wall–Ozawa method was applied to study the local activation energy of flame retardant thermoset PLA, and the results showed that with an increase of conversion of thermal degradation, the local activation energy was increased slowly.

Kinetics of Thermal Decomposition of Lime Stone

1967 ◽  
Vol 53 (7) ◽  
pp. 740-743 ◽  
Author(s):  
Kiyoshi SAWAMURA ◽  
Kazuichi MIZOGUCHI ◽  
Tetsuro HANADA ◽  
Kunihiko MAKINO
Keyword(s):  
Thermal Decomposition ◽  
Kinetics Of Thermal Decomposition ◽  
Kinetics Of ◽  
Lime Stone

Thermal Decomposition Kinetics of Torrefied Oil Palm Empty Fruit Bunch Briquettes

2016 ◽  
Vol 10 (3) ◽  
pp. 325-328 ◽  
Author(s):  
Bemgba Nyakuma ◽  
◽  
Arshad Ahmad ◽  
Anwar Johari ◽  
Tuan Abdullah ◽  
...  
Keyword(s):  
Thermal Decomposition ◽  
Oil Palm ◽  
Decomposition Kinetics ◽  
Thermal Decomposition Kinetics ◽  
Kinetic Properties ◽  
Tg Analysis ◽  
Empty Fruit Bunches ◽  
Thermal Lag ◽  
Profile Characteristics ◽  
Kinetics Of

The study is aimed at investigating the thermal behavior and decomposition kinetics of torrefied oil palm empty fruit bunches (OPEFB) briquettes using a thermogravimetric (TG) analysis and the Coats-Redfern model. The results revealed that thermal decomposition kinetics of OPEFB and torrefied OPEFB briquettes is significantly influenced by the severity of torrefaction temperature. Furthermore, the temperature profile characteristics; Tonset, Tpeak, and Tend increased consistently due to the thermal lag observed during TG analysis. In addition, the torrefied OPEFB briquettes were observed to possess superior thermal and kinetic properties over the untorrefied OPEFB briquettes. It can be inferred that torrefaction improves the fuel properties of pelletized OPEFB for potential utilization in bioenergy conversion systems.

Thermal Decomposition Kinetics of Glyphosate (GP) and its Metabolite Aminomethylphosphonic Acid (AMPA)

2019 ◽  
Author(s):  
Milad Narimani ◽  
Gabriel da Silva
Keyword(s):  
Thermal Decomposition ◽  
Reaction Rate ◽  
Decomposition Kinetics ◽  
Rate Theory ◽  
Thermal Decomposition Mechanism ◽  
Treatment Processes ◽  
Aminomethylphosphonic Acid ◽  
Reaction Rate Theory ◽  
Decomposition Chemistry ◽  
Kinetics Of

Glyphosate (GP) is a widely used herbicide worldwide, yet accumulation of GP and its main byproduct, aminomethylphosphonic acid (AMPA), in soil and water has raised concerns about its potential effects to human health. Thermal treatment processes are one option for decontaminating material containing GP and AMPA, yet the thermal decomposition chemistry of these compounds remains poorly understood. Here, we have revealed the thermal decomposition mechanism of GP and AMPA by applying computational chemistry and reaction rate theory methods. <br>

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