Thermal decomposition analysis

In this work, the preparation of 2,4,6-trinitroresorcinol by the sulfonation-nitration method of resorcinol through three stages was investigated. The results showed that the 2,4,6- trinitroresorcinol synthesis efficiency reached the highest value (82-83%) when the molar ratio of HNO3/resorcinol was 3.45/1, the temperature of the nitrate stage was 30-70 ºC, and the concentration of HNO3 solution was 72%.

7p vistephenhawking 26-04-2022 7 1   Download

Composites of BrPMAAm and FPMAAm monomers were obtained using 2%, 4%, 6%, and 10% organoclay by in situ polymerization. Molecular weights for poly(BrPMAAm), poly(BrPMAAm)-10%OSMT, poly(FPMAAm), and poly(FPMAAm)-10%OSTM were 91,300, 31,300, 17,400, and 23,700, respectively. Thermal properties of the nanocomposite were also developed when compared to the pure homopolymer. The beginning thermal decomposition temperature of nanocomposites was shifted to higher temperature. An exfoliated structure was found for the nanocomposites.

9p langthannam 29-12-2021 8 0   Download

Two novel N∧O-type Schiff base ligands and the corresponding Co(II) complexes are reported. Thermogravimetric analysis indicated that the complexes are potential molecular precursors for the fabrication of cobalt and cobalt-containing nanomaterials. The significant difference in the thermal decomposition profiles is recognized as an influence of structural differences on the complexes. Thus, the complexes were thermally decomposed using the melt and hot injection methods to examine the properties of the obtained cobalt and cobalt sulfide nanoparticles, respectively.

17p tudichquannguyet 29-11-2021 5 1   Download

A humic substance was obtained from hazelnut husk using an alkali extraction. The chemical and morphological structure of the humic matter was characterized via elemental analysis, Fourier transform infrared spectrometry (FTIR), nuclear magnetic resonance, Brunauer-Emmet-Teller (BET) analysis, scanning electron microscopy (SEM), and thermogravimetric-FTIR (TG-FTIR).

12p tudichquannguyet 29-11-2021 11 2   Download

The crystallization kinetics of an Al80Fe20 amorphous powder alloy were investigated by thermal analysis. Crystallization of amorphous Al80Fe20 during continuous heating undergoes four stages. The first-stage crystallization leads to the formation of fcc-Al from amorphous matrix. The next stages are the decomposition of the residual amorphous phase into several intermetallic compounds. The activation energies of the alloy were calculated from differential scanning calorimetry data using the Kissinger, Ozawa and Augis–Bennett models.

5p cothumenhmong11 10-05-2021 14 1   Download

The process of thermal decomposition of sugarcane biomass consists of 4 stages. On that basis, the research conducted the pyrolysis of sugarcane biomass to collect liquid products at different temperature stages and they were analyzed by GC-MS method to determine the chemical composition. Chemical composition of pyrolysis oil through thermal decomposition of sugarcane biomass was elucidated in this paper.

9p nguaconbaynhay11 16-04-2021 9 2   Download

Analysis of secondary structures is essential for understanding the functions of RNAs. Because RNA molecules thermally fluctuate, it is necessary to analyze the probability distributions of their secondary structures. Existing methods, however, are not applicable to long RNAs owing to their high computational complexity.

19p vicolorado2711 22-10-2020 6 0   Download

It was demonstrated that Poly(p-Xylylene) (PPX) could be prepared from α,α’-Bis(Alkoxy or Aryloxy) –p-Xylenes via chemical vapor decomposition (CVD)- method. This is one-step process and there are side products by the CVD-process. This effect depends both on the CVD- condition and the properties of the starting monomer. The structure and thermal behavior of the material were characterized by FTIR, UVvis spectroscopy, elemental analysis, wide-angle X-ray diffraction, DTA and DSC.

14p 12120609 01-06-2020 13 1   Download

In this study, reaction rates of the thermal decomposition reaction of 13 kinds of nitrates, which are main constituents of simulated HLLW (sHLLW), were investigated using thermogravimetrical instrument in a range of room temperature to 1000 °C.

7p christabelhuynh 30-05-2020 9 1   Download

Results showed that these wastes had a high potential for use in energy conversion technologies. Plastic waste had the highest value for volatile matter and calorific value. Meanwhile, bagasse and textile wastes had a very low ash content, suitable for thermal processes. TGA-DTG analysis showed that the thermal decomposition of bagasse and textile wastes were relatively similar, expressed in three stages: dehydration, volatile matter decomposition, and char oxidation.

7p mangamanga 29-02-2020 24 0   Download

Microwave heating was used to prepare optically active thiazole-bearing poly(amide-imide)s. Polymerization reactions were carried out in the molten tetrabutylammonium bromide as a green molten salt medium and triphenyl phosphite as the homogenizer. Structural elucidation of the compounds was performed by Fourier transform infrared and NMR spectroscopic data and elemental analysis results. The polymeric samples were readily soluble in various organic solvents, forming low-colored and flexible thin films via solution casting.

8p kethamoi1 17-11-2019 12 0   Download

In this study, we proposed a newly designed sulfuric acid transfer system for the sulfur-iodine (SI) thermochemical cycle. The proposed sulfuric acid transfer system was evaluated using a computational fluid dynamics (CFD) analysis for investigating thermodynamic/hydrodynamic characteristics and material properties. This analysis was conducted to obtain reliable continuous operation parameters; in particular, a thermal analysis was performed on the bellows box and bellows at amplitudes and various frequencies (0.1, 0.5, and 1.0 Hz).

10p minhxaminhyeu5 30-06-2019 18 1   Download

In this paper, recent advances in the CUPID code are presented in three sections. First, the domain decomposition parallel method implemented in the CUPID code is described with the parallel efficiency test for multiple processors. Then, the coupling of CUPID-MARS via heat structure is introduced, where CUPID has been coupled with a system-scale thermal-hydraulics code, MARS, through the heat structure. The coupled code has been applied to a multi-scale thermal-hydraulic analysis of a pool mixing test. Finally, CUPID-SG is developed for analyzing two-phase flows in PWR steam generators.

12p minhxaminhyeu5 30-06-2019 16 1   Download

The last stage is the continuous decomposition of lignin at higher temperature up to 580 oC. For cellulose, the thermal degradation in air atmosphere has decomposition temperature higher than that in the nitrogen atmosphere but the ending temperature is lower. On the other hand, the thermal decomposition of lignin just occurred from 150 to 560 oC. The reaction for acacia wood demonstrated three stages. The water evaporated at lower than 120 oC in the first stage. The second stage is the devolatilization of biomass (214-322 oC) and the third one (322-420 oC) is the combustion of char.

7p giesumanh 10-11-2018 27 1   Download