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Thermogravimetric analysis

About: Thermogravimetric analysis is a research topic. Over the lifetime, 37248 publications have been published within this topic receiving 862144 citations. The topic is also known as: thermal gravimetric analysis & TGA.


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Journal ArticleDOI
TL;DR: In this article, silicone rubber/organomontmorillonite hybrid nanocomposites were prepared via a melt-intercalation process, which was characterized by X-ray diffraction, transmission electron microscopy (TEM), and thermogravimetric analysis.
Abstract: In this article, silicone rubber/organomontmorillonite hybrid nanocomposites were prepared via a melt-intercalation process. The resulting hybrid nanocomposites were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), and thermogravimetric analysis (TGA). The results proved that the organomontmorillonite could be exfoliated into ca. 50-nm thickness and uniformly dispersed in the silicone rubber matrix during the melt-intercalation process. Furthermore, the mechanical properties and thermal stability of the hybrids were very close to those of aerosilica-filled silicone rubber. © 1998 John Wiley & Sons, Inc. J Appl Polym Sci 69: 1557–1561, 1998

182 citations

Journal ArticleDOI
TL;DR: In this paper, the surface of titanium dioxide (TiO 2 ) nanoparticles was modified with γ-aminopropyltriethoxy silane as a coupling agent.

182 citations

Journal ArticleDOI
TL;DR: In this paper, the data were treated as a pseudo first-order reaction for the pyrolysis of polypropylene, and several previously published interpretation methods were applied to the data, but the wide temperature range used in this work (45-580 °C) encompassed a change in the decomposition mechanism and this greatly limited the utility of the methods.

182 citations

Journal ArticleDOI
TL;DR: The preparation of microporous organic Nanotubes and the template synthesis of iron oxide nanotubes with particulate walls and their application as anode materials for high-performance lithium ion batteries are presented.
Abstract: During the last several decades, diverse porous materials have been prepared for a wide range of applications, such as adsorbents, gas storage materials, and solid supports for catalytic materials. These materials can be classified into three groups according to their components: inorganic materials, metal–organic composites, and purely organic systems. Among these porous materials, organic porous materials have recently attracted special attention because of their low densities and robustness. The accumulated organic synthetic methods can also be easily applied for the designed synthesis of organic porous materials with tailored functionalites. Thus, in a short period, diverse microporous organic networks have been prepared through diverse C C bond-forming reactions. In the synthesis of porous organic networks, the rigid building blocks are chosen so that the connection of these building blocks through covalent bonds induces the intrinsic porosity of the materials. Related studies have focused on the inner porosity and the resultant high surface area of materials. However, porous organic systems with well-defined outer shapes are rare. In particular, the template-free synthesis of hollow organic materials is quite rare. It is noteworthy that in the synthesis of secondary target inorganic materials using porous materials, the organic templates can be easily removed by combustion in air. In these cases, the outer shapes of materials along with their inner porosity are very critical for obtaining well-defined materials. Moreover, inorganic materials with a particulate surface could be obtained from the microporosity of organic network. Recently, Cooper and others have shown that Sonogashira coupling between alkynes and arylhalides is a very efficient method for the preparation of microporous organic materials. The resultant materials themselves showed promising gas-adsorption capacities. It can be expected that more diverse functional sites can be introduced into materials by designing the organic building blocks. During our trials for introduction of viologen groups into microporous organic materials, we observed the unexpected formation of microporous organic nanotubes. Herein, we present the preparation of microporous organic nanotubes and the template synthesis of iron oxide nanotubes with particulate walls and their application as anode materials for high-performance lithium ion batteries. Figure 1a shows the synthesis of microporous organic nanotubes (MONTs). For preparation of the MONT, two building blocks, N,N’-di(4-iodophenyl)-4,4’-bipyridinium dichloride (2 equiv) and tetra(4-ethynylphenyl)methane (1 equiv) were dissolved in a 3:2:2 mixture of toluene, methanol, and triethylamine. After adding catalytic amount of bis(triphenylphosphine)palladium dichloride and copper iodide, the reaction mixture was heated at 90 8C for 72 h to form precipitates. After cooling to room temperature, the solid was retrieved by centrifugation and washed with excess dimethyl sulfoxide, methanol, dichloromethane, and diethyl ether. The resultant materials were dried under a vacuum for a day. The obtained precipitates were investigated by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). As shown in typical SEM images(Figure 1b), the obtained materials have a 1D character with mild ending-parts. Interestingly, a careful investigation of the materials by TEM revealed the hollow inner space and dark-contrasted walls (Figure 1c–e; Supporting Information, Figure S1). The average diameter and thickness of the wall of MONT were (92 19) nm and (31 4) nm, respectively. Brunauer– Emmett–Teller (BET) analysis showed the microporous character of materials with type I N2 isotherm at 77 K, 765.0 mg 1 surface area, and 1.01 cmg 1 pore volume (P/P0=0.995; Figure 2a). Powder X-ray diffraction (PXRD) studies revealed the amorphous character of MONT that has been observed previously (Supporting Information, Figure S2). Thermogravimetric analysis (TGA) of the materials showed that they are stable up to 205 8C and then slowly decomposed at a higher temperature (Figure 2b). Solidstate C NMR spectroscopy showed signals at d= 62 ppm, d= 90 ppm, and d= 120–160 ppm for benzyl, alkyne, and aryl groups, respectively (Figure 2c). Elemental analysis of mate[*] N. Kang, Dr. J. H. Park, J. Choi, J. Jin, J. Chun, Dr. I. G. Jung, Prof. S. U. Son Department of Chemistry and Department of Energy Science Sungkyunkwan University, Suwon 440-746 (Korea) E-mail: sson@skku.edu

182 citations

Journal ArticleDOI
TL;DR: The effect of cellulose crystallinity on the formation of a liquid intermediate and on its thermal degradation was studied thermogravimetrically and by Py-GC/MS using a control cellulose (Avicel, crystallinity at 60.5%) and ball-milled Avicel (low cellulose, 6.5%).

182 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20241
20232,906
20225,921
20212,097
20202,157
20192,095