scholarly journals Thermal Decomposition Properties of Epoxy Resin in SF6/N2 Mixture

Materials ◽  
2018 ◽  
Vol 12 (1) ◽  
pp. 75 ◽  
Author(s):  
Hao Wen ◽  
Xiaoxing Zhang ◽  
Rong Xia ◽  
Zilai Yang ◽  
Yunjian Wu
Keyword(s):  
Thermal Decomposition ◽  
Thermal Properties ◽  
Epoxy Resin ◽  
Volume Fraction ◽  
Decomposition Process ◽  
Environment Friendly ◽  
Promising Alternative ◽  
Reaxff Force Field ◽  
Thermal Stability Of ◽  
Decomposition Properties

As a promising alternative for pure SF6, the mixture of SF6/N2 appears to be more economic and environment-friendly on the premise of maintaining similar dielectric properties with pure SF6. But less attention has been paid to the thermal properties of an SF6/N2 mixture, especially with insulation materials overheating happening simultaneously. In this paper, thermal decomposition properties of epoxy resin in SF6/N2 mixture with different SF6 volume rates were studied, and the concentrations of characteristic decomposition components were detected based on concentrations change of some characteristic gas components such as CO2, SO2, H2S, SOF2, and CF4. The results showed that thermal properties of 20% SF6/N2 (volume fraction of SF6 is 20%) mixture has faster degradation than 40% SF6/N2 mixture. As ratio of SF6 content decreases, thermal stability of the system decreases, and the decomposition process of SF6 is exacerbated. Moreover, a mathematical model was established to determine happening of partial overheating faults on the epoxy resin surface in SF6/N2 mixture. Also thermal decomposition process of epoxy resin was simulated by the ReaxFF force field to reveal basic chemical reactions in terms of bond-breaking order, which further verified that CO2 and H2O produced during thermal decomposition of epoxy resin can intensify degradation of SF6 dielectric property.

Effects of graphene on thermal properties and thermal stability of polycarbonate/graphene nanocomposite

2021 ◽  
pp. 089270572199788
Author(s):  
Md Amir Sohel ◽  
Abhijit Mondal ◽  
P Mohammad Arif ◽  
Sabu Thomas ◽  
Asmita SenGupta
Keyword(s):  
Thermal Stability ◽  
Thermal Decomposition ◽  
Glass Transition ◽  
Thermal Properties ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Multilayer Graphene ◽  
Melt Mixing ◽  
Graphene Nanocomposite ◽  
Thermal Stability Of

Polycarbonate (PC) /graphene nanocomposite was prepared using multilayer graphene (MLG) with loadings of 0.5, 1, and 3 wt% via melt mixing process. Morphological, structural, and thermal properties of the PC/MLG nanocomposites are investigated to look into the influence of MLG on the nanocomposite. A significant increase (∼6.4°C) in glass transition temperature is observed upon the addition of 3 wt% of MLG into the polycarbonate matrix. This increase in glass transition temperature may be due to the interaction between the MLG and polycarbonate polymer matrix. The specific heat capacity of pure PC and PC/MLG nanocomposites varies linearly with temperature below their glass transition. Upon the addition of MLGs, the overall thermal stability of PC/MLG nanocomposites increases with MLG loadings. A maximum increase about 29.23°C in T onset of thermal decomposition is observed in PC/MLG nanocomposite having 3 wt% of MLG loading. The activation energy ( Ea) of thermal decomposition is also calculated by kinetic analysis of thermal decomposition of the PC/MLG nanocomposites using Horowitz–Metzger and Broido’s methods.

scholarly journals A Preliminary Investigation on Processing, Mechanical and Thermal Properties of Polyethylene/Kenaf Biocomposites with Dolomite Added as Secondary Filler

2015 ◽  
Vol 2015 ◽  
pp. 1-7 ◽  
Author(s):  
Ahmad Adlie Shamsuri ◽  
Mohammad Naqiuddin Mohd Zolkepli ◽  
Azmah Hanim Mohamed Ariff ◽  
Ahmad Khuzairi Sudari ◽  
Mazni Abu Zarin
Keyword(s):  
Thermal Decomposition ◽  
Thermal Properties ◽  
Natural Fiber ◽  
Preliminary Investigation ◽  
Tensile Modulus ◽  
Low Density Polyethylene ◽  
Mechanical And Thermal Properties ◽  
Core Fiber ◽  
Internal Mixer ◽  
Decomposition Properties

In this preliminary investigation, dolomite was added to the low-density polyethylene/kenaf core fiber (LDPE/KCF) biocomposites by using an internal mixer at 150°C, followed by compression molding at the same temperature. The dolomite contents were varied from 0 to 18 wt.%. The processing and stabilization torques, the stock and stabilization temperatures, the tensile and impact strengths, and the thermal decomposition properties of the prepared biocomposites have been characterized and analyzed. The processing recorder results of the LDPE/KCF biocomposites indicated that the stabilization torques and stabilization temperatures have increased with the addition of dolomite. Mechanical testing results showed that the presence of dolomite has increased the tensile stress, tensile modulus, and impact strength of the LDPE/KCF biocomposites. Thermogravimetric analysis results displayed that the thermal decomposition properties of the biocomposites have also increased with the increase of the dolomite content. This research led to the conclusion that the addition of dolomite in lower amounts (<20 wt.%) could act as a secondary filler for improving the processing, mechanical and thermal properties of LDPE/KCF biocomposites without surface treatments of the natural fiber.

Thermal behavior of N-Methylaniline modified phenolic friction composites

2021 ◽  
pp. 096739112110207
Author(s):  
Yusubov Fikrat Fakhraddin
Keyword(s):  
Thermal Stability ◽  
Thermal Properties ◽  
Composite Materials ◽  
Phenolic Resin ◽  
Degradation Mechanism ◽  
Thermal Characteristics ◽  
Friction Materials ◽  
Binder Material ◽  
Thermal Stability Of ◽  
Decomposition Properties

This article discusses observations on thermal stability, decomposition properties and degradation of organic components of friction composite materials fabricated by powder metallurgy techniques. N-Methylaniline modified phenolic resin used as a binder material in the preparation of composite materials. Thermogravimetry method was used to study the thermal properties of the samples. The experiments were performed on a TGA Q50 (TA Instrument) in an oxygen atmosphere. In order to better assess the thermal characteristics of the composites, the analyses were carried out by separating thermographs into three parts according to the degradation mechanism. The obtained results helped to assess the thermal stability of the friction materials. The degradation of phenolic resin was observed in the temperature range of 312–362°C. It was found that barite and copper-graphite particles improve the thermal characteristics of the samples.

scholarly journals Mechanical, Electrical, and Thermal Properties of Carbon Nanotube Buckypapers/Epoxy Nanocomposites Produced by Oxidized and Epoxidized Nanotubes

Materials ◽  
2020 ◽  
Vol 13 (19) ◽  
pp. 4308
Author(s):  
George Trakakis ◽  
Georgia Tomara ◽  
Vitaliy Datsyuk ◽  
Labrini Sygellou ◽  
Asterios Bakolas ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Thermal Properties ◽  
Carbon Nanotube ◽  
Epoxy Resin ◽  
Interfacial Reaction ◽  
Chemical Treatment ◽  
Volume Fraction ◽  
High Volume ◽  
Chemical Oxidation ◽  
Multifunctional Composites

High volume fraction carbon nanotube (CNT) composites (7.5–16% vol.) were fabricated by the impregnation of CNT buckypapers into epoxy resin. To enhance the interfacial reaction with the epoxy resin, the CNTs were modified by two different treatments, namely, an epoxidation treatment and a chemical oxidation. The chemical treatment was found to result in CNT length severance and to affect the porosity of the buckypapers, having an important impact on the physico-mechanical properties of the nanocomposites. Overall, the mechanical, electrical, and thermal properties of the impregnated buckypapers were found to be superior of the neat epoxy resin, offering an attractive combination of mechanical, electrical, and thermal properties for multifunctional composites.

Kinetic Analysis of Thermal Decomposition of Epoxy Resin/Polyaniline Nanocomposites

2011 ◽  
Vol 213 ◽  
pp. 502-505 ◽  
Author(s):  
Shao Yun Shan ◽  
Qing Ming Jia ◽  
Li Hong Jiang ◽  
Ya Ming Wang
Keyword(s):  
Thermal Decomposition ◽  
Kinetic Analysis ◽  
Epoxy Resin ◽  
Inert Atmosphere ◽  
Pani Nanofibers ◽  
Thermal Degradation Behavior ◽  
Isoconversional Analysis ◽  
Fwo Method ◽  
Thermal Stability Of

Polyaniline(PANI) nanofibers were firstly prepared by rapid mixture method, EP/PANI nanocomposite was obtained by in-situ adding the PANI nanofibers to epoxy resin(EP). Thermal degradation behavior of PANI and kinetic analysis of thermal decomposition of EP/PANI nanocomposites were investigated in detail by using thermogravimetric analyser (TGA) in inert atmosphere. Typical three step decomposition profiles of PANI were obtained. On the basis of isoconversional analysis by the methods of Kissinger-Akahira-Sunose method(KAS method) and Flynn-Wall-Ozawa method(FWO method), it was found that the value of the activation energy of EP/PANI nanocomposites is higher than that of pure EP, which proves that PANI nanofibers obviously improve the thermal stability of pure EP.

Thermal Decomposition Mechanism of 2-Nitroimino-5-Nitro-Hexahydro-1,3,5-Triazine (NNHT)

2013 ◽  
Vol 364 ◽  
pp. 635-639 ◽  
Author(s):  
Ying Hui Ren ◽  
Feng Qi Zhao ◽  
Wen Li ◽  
Jian Hua Yi ◽  
Ji Rong Song ◽  
...  
Keyword(s):  
Thermal Decomposition ◽  
Thermal Properties ◽  
Decomposition Process ◽  
Decomposition Mechanism ◽  
Thermal Decomposition Mechanism ◽  
Gaseous Products ◽  
Exothermic Decomposition

The thermal properties and the decomposition mechanism of 2-nitroimino-5-nitro-hexahydro-1,3,5-triazine (NNHT) were studied by DSC-TG-IR-MS technology. The results show that the hexahydric ring framework cracking and the nitroamino group [NNO2] breaking induce to the major exothermic decomposition process. The gaseous products are H2O, N2, CO2, N2O, HCHO, NH3, CH2, NH2, CHO, HCN, HNCO, and NO2.

Energetic propane-1,3-diaminium and butane-1,4-diaminium salts of N,N′-dinitroethylenediazanide: syntheses, crystal structures and thermal properties

2019 ◽  
Vol 75 (1) ◽  
pp. 54-60
Author(s):  
Gerhard T. Roodt ◽  
Bhawna Uprety ◽  
Demetrius C. Levendis ◽  
Charmaine Arderne
Keyword(s):  
Thermal Stability ◽  
Thermal Decomposition ◽  
Hydrogen Bonding ◽  
Thermal Properties ◽  
Monoclinic Space Group ◽  
Salt Formation ◽  
Orthorhombic Space Group ◽  
Space Group ◽  
Hydrogen Bonding Networks ◽  
Thermal Stability Of

The acidity of the amine H atoms and the consequent salt formation ability of ethylenedinitramine (EDNA) were analyzed in an attempt to improve the thermal stability of EDNA. Two short-chain alkanediamine bases, namely propane-1,3-diamine and butane-1,4-diamine, were chosen for this purpose. The resulting salts, namely propane-1,3-diaminium N,N′-dinitroethylenediazanide, C3H12N2 2+·C2H4N4O4 2−, and butane-1,4-diaminium N,N′-dinitroethylenediazanide, C4H14N2 2+·C2H4N4O4 2−, crystallize in the orthorhombic space group Pbca and the monoclinic space group P21/n, respectively. The resulting salts display extensive hydrogen-bonding networks because of the presence of ammonium and diazenide ions in the crystal lattice. This results in an enhanced thermal stability and raises the thermal decomposition temperatures to 202 and 221 °C compared to 180 °C for EDNA. The extensive hydrogen bonding present also plays a crucial role in lowering the sensitivity to impact of these energetic salts.

Non-Isothermal Decomposition Kinetic of Polypropylene/Hydrotalcite Composite

2019 ◽  
Vol 19 (11) ◽  
pp. 7493-7501 ◽  
Author(s):  
Sheng Xu ◽  
Min Zhang ◽  
Siyu Li ◽  
Moyu Yi ◽  
Shigen Shen ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Thermal Decomposition ◽  
Nitrogen Atmosphere ◽  
Heating Rates ◽  
Decomposition Reactions ◽  
Kinetic And Thermodynamic Parameters ◽  
Málek Method ◽  
Boundary Reaction ◽  
Phase Boundary Reaction ◽  
Thermal Stability Of

P3O5-10 pillared Mg/Al hydrotalcite (HTs) as a functional fire-retarding filler was successfully prepared by impregnation-reconstruction, where the HTs was used to prepare polypropylene (PP) and HTs composite (PP/HTs). Thermal decomposition was crucial for correctly identifying the thermal behavior for the PP/HTs, and studied using thermogravimetry (TG) at different heating rates. Based on single TG curves and Málek method, as well as 41 mechanism functions, the thermal decompositions of the PP/HTs composite and PP in nitrogen atmosphere were studied under non-isothermal conditions. The mechanism functions of the thermal decomposition reactions for the PP/HTs composite and PP were separately “chemical reaction F3” and “phase boundary reaction R2,” which were also in good agreement with corresponding experimental data. It was found that the addition of the HTs increased the apparent activation energy Ea of the PP/HTs comparing to the PP, which improved the thermal stability of the polypropylene. A difference in the set of kinetic and thermodynamic parameters was also observed between the PP/HTs and PP, particularly with respect to lower ΔS≠ value assigned to higher thermal stability of the PP/HTs composite.

Sign in / Sign up

Export Citation Format

Share Document