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Thermal stability

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Advanced fabrication of lightweight aerogels from fly ash for thermal insulation

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Moreover, the thermal conductivity of our FA aerogels is comparable to some commercial in- sulation materials such as mineral wool W/m.K), fiberglass W/m.K), expanded polystyrene W/m.K) and other silica aerogels from gold mine (above 0.2 W/m.K), coal gangue (0.026 W/m.K), and dislodged sludge W/m.K) 11–14 . Thermal stability of FA aerogels. Regarding the TGA results presented in Figure 3a, a gradual increase in FA concentration plays an impact on the thermal stability of FA aerogels.

Characterization and kinetics analysis of the thermal decomposition of the humic substance from hazelnut husk

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Thermal analysis experiments with FTIR analysis indicated that the humic substance decomposed at above 700 °C, and the inorganic components made the carbonaceous structure very resistant. In the other words, the components of the humic substance attained high thermal stability. As a result, it can be said that a humic substance with high thermal stability can be obtained from waste material (hazelnut husk).. Journal of the Brazilian Chemical Society 2009.

Improving the mechanical and thermal properties of chlorinated poly(vinyl chloride) by incorporating modified CaCO3 nanoparticles as a filler

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The addition of modified CaCO 3 nanoparticles to the CPVC matrix improved the thermal stability of the prepared nanocomposites when compared with the pure CPVC polymer.. Moreover, the CPVC/CaCO 3 nanocomposite containing 3.75% CaCO 3 was the most stable sample among pure CPVC and other nanocomposites. Finally, it can be concluded that addition of the modified CaCO 3 nanoparticles improved the thermal stability of the nanocomposites compared with the blank CPVC polymer matrix [26]..

ProTstab – predictor for cellular protein stability

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Protein structure and the energetics of protein stability. Revisiting the correlation between proteins ’ thermoresistance and organisms ’ thermophilicity. Volsurf computational method applied to the prediction of stability of thermostable enzymes.. Towards an accurate prediction of the thermal stability of homologous proteins. Relationship of protein flexibility to thermostability. Accuracy of protein flexibility predictions..

Synthesis of new cyclotriphosphazene derivatives bearing Schiff bases and their thermal and absorbance properties

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TGA was utilized to evaluate the thermal stability of the Schiff bases (2a–2d) and compounds (3a–3d). The DSC curves of compounds 3a–3d heated under nitrogen to 300 ◦ C at a heating rate of 10 ◦ C/min.. Thermal analysis results of compounds 1, 2a–2d, and 3a–3d.. Schiff bases. The thermal stabilities of the new cyclotriphosphazene derivatives (3a–3d) are obviously higher than those of the Schiff bases (2a–2d) and cyclotriphosphazene (1). The thermal stability of the.

Fabrication of multilayer graphene oxide-reinforced high density polyethylene nanocomposites with enhanced thermal and mechanical properties via thermokinetic mixing

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Thermal behaviors of TEGO-reinforced HDPE composites. Figure 4 exhibits thermal gravimetric analysis (TGA) curves of HDPE nanocomposites with different TEGO loadings under N 2 atmosphere. The degradation curves showed that neat HDPE specimen starts to lose weight at around 230 ◦ C, whereas HDPE containing TEGO sheets can preserve thermal stability up to 300 ◦ C and then they start to degrade.

Synthesis and evaluation of a novel N–P-containing oil-based fire-retardant plasticizer for poly(vinyl chloride)

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TGA showed that the thermal stability of the blends were acceptable. The limiting oxygen index (LOI) of the blends ranged from 21.3 to 29.6.

Novel flame retardant poly(thiourea-sulfone-imide)s for high temperature applications: synthesis and characterization

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The 10% weight loss above 450 ◦ C showed the effectiveness of the introduction of diacid BPDA for improving the thermal stability of the polyimides.

Effect of polyvinyl alcohol/chitosan blend ratios on morphological, optical, and thermal properties of electrospun nanofibers

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TGA curve of PVA and PVA/CS blend fibers with various weight ratios (a) and flow rates (b).. compared to PVA/CS blend fibers. 35 This can be due to the thermal stability of CS and PVA. TGA data of the electrospun fibers at different electrospinning parameters.. PVA/CS 5% (w/w), 0.8 mL/h . PVA/CS 5% (w/w), 1.0 mL/h . PVA/CS 5% (w/w), 1.4 mL/h . In this study, PVA/CS blend fibers were prepared from their solutions by using an electrospinning method..

Preparation of epoxidized sunflower oil metal soap derivatives and their use as heat stabilizers for polyvinyl chloride

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The residual thermal stability was evaluated according to the thermal stability determined by the change in color of PVC. 40 The method consists of putting a sample (0.5 g) of PVC in a sealed test tube and the set is immersed into an oil bath heated at 200 °C. A change in the color of the PVC sample from opaque white to brown to black was observed. The time required for the appearance of the color is associated with the residual thermal stability.. Discoloration analysis of PVC films.

Synthesis and characterization of thermally stable camphor-based polyimide–clay nanocomposites

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The thermal stability of the PI–MMT nanocomposites was improved by the addition of OM-MMT

Synthesis and characterization of halogen-containing aryl amide polymer-clay nanocomposites

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The increase in thermal stability is due to the silicate layer dispersed in the polymer matrix causing physical protection. This can be explained by the intercalated structure observed in the XRD pattern..

Highly efficient catalytic degradation of low-density polyethylene Using a novel tungstophosphoric acid/kaolin clay composite catalyst

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The use of kaolin increases the thermal stability of TPA. Crystal size of TPA on average was 1 µ m. TPA loaded on kaolin. Thermal catalytic cracking of low density polyethylene (LDPE). It is well known that acidic catalysts lower the degradation temperature of polyethylene and improve the yield of hydrocarbons.

Preparation and physicochemical characterization of zinc oxide/sodium cellulose composite for food packaging

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We can suggest that Zn ions were incorporated into the sodium cellulose matrix and created strong linkage bonds with higher binding energy, glass transition temperature, and thermal stability during the fabrication process in the application.

The synthesis and characterization of polyorganosiloxane nanoparticles from 3-mercaptopropyltrimethoxysilane for preparation of nanocomposite films via photoinitiated thiol-ene polymerization

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Properties of the nanocomposite films such as decomposition temperature, thermal glass transition temperature, tensile strength, hardness, and particle distribution were investigated and the results were compared with each other and neat film. The addition of MPTMS-modified silica particles did not improve the thermal stability of the films. The combination of the epoxy resins and methacyrlates has a major effect in polymerization systems due to the contribution of unique abilities of each.

Characterization and purification of 1,2,4-triazole-containing phthalocyanines synthesized by microwave method and structure elucidation by spectroscopic techniques

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It seems that binding of the 1,2,4-triazol group to the Pc ring decreases thermal stability. The thermal stability of these compounds was found to be in the order of 9 >. Thermal behaviors of the novel Pcs.. The absorption spectra of the metallated Pc complexes consist of an intense absorption band in the visible region of about 670 nm, which is called the Q-band, and a weaker band of about 340 nm, which is called the B-band.

A study on temperature distribution of the high voltage porcelain insulator string

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Determining the thermal stability time of the sample insulator under the tested voltage U N of 127kV, the experiment for this case was done based on the electrified conditions of the power grid, in which the insulator samples were applied on the voltage U N and the simulated time is about five hours with purpose to study the characteristics of the insulator temperature change and detect the required time to reach thermal stability. 5 plots the temperature of porcelain changing with time 6 hours of

Investigation of the embedded fiber bragg grating temperature sensor

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The theoretical prediction of the nonlinearity in the thermal response of the Bragg wavelength was described in [11,12]. The sensor’s stability depends highly on the thermal stability of the experiment environment. Averaging over 50 events in experiment with Peltier cooler in good isolated space yielded the stability of 1 pm, which is approximately equivalent to the temperature sensitivity. Based on received FBG characteristics in this paper two designs of the sensor were presented:.

The chemistry concerned with the sonochemical-assisted synthesis of CeO2/poly(amic acid) nanocomposites

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Furthermore, amide units in the structure of PAA improved the thermal stability of the polymer structure. In addition, the presence of inorganic nanofillers in the structure of nanocom- posites increases the thermal stability of the polymer matrix. In the first step, in the range of 200–350 ◦ C, the illustrated weight losses were related to the water removal and the thermal imidazation process.

On the magnetic nanostructure of a Co-Cu alloy processed by high-pressure torsion

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The thermal stability can be reduced further by a positive heat of mixing, as it is the case for the pre- sented Co e Cu samples [11]. Therefore, a detailed investigation of the thermal stability of a Co72 e Cu28 (wt. alloy is carried out in the following, serving as an example of the Co e Cu alloys described above. 2(a) shows the micrograph of a sample consisting of Co72 e Cu28 in the as-deformed state.