• Title, Summary, Keyword: Thermogravimetric Analysis

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Thermogravimetric Analysis of Wood and RDF for application to Gasification (가스화로의 확장을 위한 나무와 RDF의 열중량 분석)

  • Kim, Tae-Hyun;Choi, Sang-Min
    • 한국연소학회:학술대회논문집
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    • pp.156-159
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    • 2006
  • Gasification and melting method is one of the most potential means for waste treatment process with low emission of fly ash or heavy metal, dioxin and high possibility of using slags as resources. Moisture contents influences directly a gasification characteristics of waste. So it is necessary to investigate the effect of moisture contents in gasification. But it is hard to consider the effect of moisture contents, using samples of powder form of Milligram's order in existing thermogravimetric analyser. Therefore, we made a thermogravimetric analysis device to applicate samples of Gram's order. Gasification characteristics are typically reported with result from thermogravimetric analysis date for wood and RDF samples along with changing moisture contents. It is discussed the way to apply these analysis results to gasification and melting furnace.

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Studies on the Miscibility of Methylcellulose/Chitosan Blends by Thermogravimetric Analysis and Thermodynamic Mechanical Analysis (열분석기기를 이용한 메틸셀룰로오스/키토산 블랜드의 상용성에 관한 연구)

  • Park, Jun-Seo;Shin, Ki-Ho
    • KOREAN JOURNAL OF PACKAGING SCIENCE & TECHNOLOGY
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    • v.8 no.2
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    • pp.18-26
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    • 2002
  • Films of methylcellulose(MC), chitosan and their blends were prepared using water and acid solution as a solvent. The transition behavior and miscibility of polymers and their blends were characterized by dynamic mechanical analysis(DMA) and thermogravimetric analysis(TGA). The DMA analysis of PEG400/MC blends has shown that PEG400 was compatible with MC and was effective plasticizer since the curves of $tan{\delta}$ against temperature exhibited single peak, corresponding to single glass transition temperature, which were displaced to lower values with increasing PEG400 content. Results of DMA analysis and TGA analysis of MC/chitosan blends indicate that there are some miscibility between MC and chitosan in the blends, attributed to the similarities between two polysaccharides and interactions of two polymers in the blends. The inclusion of PEG400 in the blends increase the miscibility between two components in the blends.

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Study on the Flame-Retardant Mechanism by Thermogravimetric Analysis (열중량 분석에 의한 방염 메카니즘의 규명)

  • 이의소
    • Textile Science and Engineering
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    • v.30 no.4
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    • pp.315-319
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    • 1993
  • This study was carried out to investigate the flame-retardant mechanism of polyester fabrics treated with a mixture of bromine compounds/antimony trioxide. For this purpose polyester fabrics were treated by pad-dry-cure method with the aqueous dispersion solutions of decabromodiphenyl oxide/antimony trioxide or hexabromocyclododecane/antimony trioxide using a binder. The flame-retardant mechanism was studied by thermogravimetric analysis and confirmed by the residue number method. The flame retardancy was found to be operative in the gas phase mechanism. This was also confirmed by comparison with those of diammonium phosphate treated polyester fabrics of the condensed phase mechanism. Thermogravimetric analysis curves were considered to be one of effective tools to differentiate the flame-reame-retardant mechanism.

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Thermogravimetric Analysis of Rice Husk Flour for a New Raw Material of Lignocellulosic Fiber-Thermoplastic Polymer Composites

  • Kim, Hyun-Joong;Eom, Young-Guen
    • Journal of the Korean Wood Science and Technology
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    • v.29 no.3
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    • pp.59-67
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    • 2001
  • Rice husk flours were analyzed by chemical composition and thermogravimetric methods in nitrogen atmosphere to discuss its feasibility as a raw material for manufacturing agricultural lignocellulosic fiber-thermoplastic polymer composite. It was revealed in the chemical composition analysis that rice husk flour was composed of moisture, 5.0%; lignin, 21.6%; holocellulose, 60.8%; ash, 12.6%. In the thermogravimetric analysis (TGA), thermal decomposition behavior of rice husk flour from room temperature to $350^{\circ}C$ was similar to that of wood flour, but rice husk flour was more thermally stable from 350 to $800^{\circ}C$ than wood flour because of higher silica content in the rice husk flour and smaller particle size of rice husk flour. The activation energy of thermal decomposition was evaluated using Flynn & Wall expression. As the thermal decomposition proceeded in rice husk flour, the activation energy of thermal decomposition appeared almost constant up to ${\alpha}=0.25$, but thereafter increased. Activation energy of thermal decomposition in wood flour, however, decreased steeply up to ${\alpha}=0.3$, but thereafter remained almost constant. From the results, rice husk flour was thought be a substitute for wood flour in manufacturing agricultural lignocellulosic fiber-thermoplastic polymer composite in the aspect of thermal decomposition.

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Differential Scanning Calorimetric and Thermogravimetric Analysis of Silk Fibroin / poly (Vinyl pyrrolidone) (견단백질 / Poly (Vinyl pyrrolidone)의 열특성)

  • Kweon, Hae-Yong;Lee, Kwang-Gill;Yeo, Joo-Hong;Woo, Soon-Ok;Han, Sang-Mi
    • Journal of Sericultural and Entomological Science
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    • v.49 no.2
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    • pp.77-80
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    • 2007
  • Silk fibroin/poly (vinyl pyrrolidone) conjugates were prepared and characterized through differential thermal calorimeter and thermogravimetry. The glass transition temperature (Tg) of poly (vinyl pyrrolidone) was not changed by reaction with silk fibroin. However, abnormal exothermic peak was observed at the silk fibroin/poly (vinyl pyrrolidone) conjugates. Thermogravimetric analysis showed that thermal stability of silk fibroin was relatively increased by reaction with PVP.

Thermal and Rheological Studies of Ricinodendron Heudelotii Wood for Its Pulp Production Potential

  • Ogunleye, Bolade Mercy;Fabiyi, James Sunday;Fuwape, Joseph A.
    • Journal of Forest and Environmental Science
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    • v.32 no.4
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    • pp.323-328
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    • 2016
  • Thermal stability and rheological behaviors of Ricinodendron heudelotii wood were investigated. Thermogravimetric analysis conducted at a heating rate of $10^{\circ}C/min$ from 20 to $600^{\circ}C$ in a nitrogen atmosphere indicated that there was no variation in the decomposition of the onset and final temperature for all the polymers. The thermal behaviours were investigated at a temperature range from 130 to $0^{\circ}C$ at $3^{\circ}C/min$, multi-frequencies of 0.1-10 Hz using dynamic mechanical analysis. N-methyl-2-pyrolidone saturated specimens were tested while submerged under the same solvent. Polymers decomposition pattern during thermogravimetric analysis are similar in the radial position of the wood. The glass transition temperature (Tg) of R. heudelotii is $45{\pm}1^{\circ}C$ at 0.1 Hz. The Tg differs from the innerwood to outerwood. The Tg showed that N-methyl-2-pyrolidone saturated R. heudelotii would require low energy consumption during chemi-thermomechanical pulping.

COMBUSTION KINETICS OF POLYETHYLENE TEREPHTHALATE

  • Oh, Sea-Cheon;Lee, Dong-Gyu;Kwak, Hyun;Bae, Seong-Youl
    • Environmental Engineering Research
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    • v.11 no.5
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    • pp.250-256
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    • 2006
  • The combustion kinetics of poly(ethylene terephthalate) (PET) was studied by the dynamic model which accounts for the thermal decomposition of polymer at any time. The kinetic analysis was performed by a conventional nonisothermal thermogravimetric (TG) technique at several heating rates between 10 and 40 K/min in air atmosphere. The thermal decomposition of PET in air atmosphere was found to be a complex process composed of at least two stages for which kinetic values can be calculated. The combustion kinetic analysis of PET gave apparent activation energy for the first stage of $257.3{\sim}269.9\;kJ/mol$, with a value of $140.5{\sim}213.8\;kJ/mol$ for the second stage. To verify the effectiveness of the kinetic analysis method used in this work, the kinetic analysis results were compared with those of various analytical methods. The kinetic parameters were also compared with values of the pyrolysis of PET in nitrogen atmosphere.

Lifetime Prediction of PTFE Electrical Insulation Material Using Thermal Analysis Technique (열분석장치를 적용한 PTFE 전기절연재의 수명 예측 연구)

  • Yoon, Sung-Ho
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • pp.296-297
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    • 2011
  • A series of thermogravimetric analysis tests were conducted to predict the lifetime of the PTFE electrical insulation material. The prepared PTFE samples were heated from $25^{\circ}C$ to $700^{\circ}C$ at different heating rates. The kinetic energy of the PTFE was calculated from the logarithmic heating rate versus reciprocal temperature curves at constant conversion levels. Also, the lifetime of the PTFE for a given operating temperature can be predicted using the relationship between the activation energy and the estimated lifetime proposed by Toop.

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Thermal Decomposition Behavior and Durability Evaluation of Thermotropic Liquid Crystalline Polymers

  • Shin, Sang-Mi;Kim, Seong-Hun;Song, Jun-Kwang
    • Macromolecular research
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    • v.17 no.3
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    • pp.149-155
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    • 2009
  • The thermal decomposition behavior and degradation characteristics off our different thermotropic liquid crystalline polymers (TLCPs) were studied. The thermal decomposition behavior was determined by means of thermogravimetric analysis (TGA) at different heating rates in nitrogen and air. The order of the thermal stability was as follows: multi-aromatic polyester > hydroxybenzoic acid (HBA)/hydroxynaphthoic acid (HNA) copolyester > HNA/hydroxyl acetaniline (HAA)/terephthalic acid (TA) copolyester > HBA/Poly(ethylene terephthalate) (PET) copolyester. The activation energies of the thermal degradation were calculated by four multiple heating rate methods: Flynn-Wall, Friedman, Kissinger, and Kim-Park. The Flynn-Wall and Kim-Park methods were the most suitable methods to calculate the activation energy. Samples were exposed to an accelerated degradation test (ADT), under fixed conditions of heat ($63{\pm}3^{\circ}C$), humidity ($30{\pm}4%$) and Xenon arc radiation ($1.10\;W/m^2$), and the changes in surface morphology and color difference with time were determined. The TLCPs decomposed, discolored and cracked upon exposure to ultraviolet radiation.