Characterization of thermal reaction by peak temperature and height of DTG curves

Kim, Seungdo; Park, Jae K.

doi:10.1016/0040-6031(95)02316-t

Cited by 76 publications

(38 citation statements)

References 16 publications

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“…The DTG dehydration peak for lyocell shows a linear trend to lower temperature with increasing magnesium chloride concentration, according to Fig. 5, which is evidence of a reduction in activation energy for the reaction in proportion to the amount of Lewis acid present (Kim and Park 1995). From this relationship is consistent with the mechanism of general acid catalysis.…”

Section: Thermal Analysissupporting

confidence: 50%

Controlled thermo-catalytic modification of regenerated cellulosic fibres using magnesium chloride Lewis acid

et al. 2009

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The Lewis-acid catalytic reactions of magnesium chloride with regenerated cellulosic fibres under baking conditions can be interpreted using existing semi-crystalline morphological models. Reaction at 180°C is associated with chain scission, which takes place randomly within the accessible regions of the fibre structure. This causes a rapid reduction in the cellulose degree of polymerization, which stabilizes at a limiting value, analogous to that observed with wet-state mineral acid catalysed hydrolysis. A slower scission-reaction is also observed, believed to be due to the liberation of single glucan units from crystallite ends, again analogous to wetstate mineral acid hydrolysis. Dry-state catalysis is promoted by thermal molecular motion, allowing migration of catalyst ions and also conformational flexing of the cellulose polymer, which also induces a small amount of recrystallisation at crystallite lateral surfaces. Differences in the dry-state reaction have been observed for lyocell, viscose and modal regenerated fibres, which can be related to differences in crystallinity and resulting accessibility of the magnesium chloride catalyst. For lyocell the accessibility towards magnesium chloride is lower than found with mineral acids, which may be significant in the development of treatments to promote mechanical fibrillation, without sacrificing fibre tensile properties.

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Section: Thermal Analysissupporting

confidence: 50%

Controlled thermo-catalytic modification of regenerated cellulosic fibres using magnesium chloride Lewis acid

et al. 2009

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“…However, the International Congress on Thermal Analyses and Calorimetry (ICTAC) has proposed that the Arrhenius parameters should be computed by isoconversional methods. Accordingly, in the kinetic study of OAN, FWO [54,55], Tang [56], KAS [57,58], FR [59], Kim-Park [60] and Kissinger procedures [57] were employed to determine the activation energy, E of the decomposition reaction for the conversion degree, α varying in the range of 0.05-0.95 in a step of 0.05. Such isoconversional methods mentioned above were chosen as they were independent of heating rate and any thermal decomposition mechanisms.…”

Section: Thermokinetic Parameters Of Oanmentioning

confidence: 99%

Chemical oxidative polymerization, optical, electrochemical and kinetic studies of 8-amino-2-naphthol

et al. 2015

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Here the polymerization of 8-amino-2-naphthol (AN) is reported without use of an additional external template, surfactants or functional dopants. For this, NaOCl and hydrochloride acid solution (1.0 M) were used as oxidant and reaction medium, respectively. The structure of oligomer was elucidated by FT-IR, UV-vis and 1 H-NMR techniques. The number average molecular weight of oligomer was found to be 2200Da with a polydispersity index of 1.4 by size exclusion chromatography. This oligomer exhibited a multicolor emission behavior as it was excited at different wavelenghts. Redox states were clarified by cyclic voltammetry (CV) technique and the relationship between anodic/cathodic peak currents vs. scan rates was determined. Thermal analysis and XRD data assigned that the resulting oligomer was in a semi-crystalline form. The activation energy related to the solid state decomposition was calculated from differential and integral non-isothermal methods and the lowest value using Kissinger procedures was determined to be 79.53 kJ/mol in N 2 atmosphere.

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“…Kissinger's method 29 has been used to estimate E a ; it involves the maximum temperature of the first-derivative weight-loss curves in TGA measurements at a constant heating rate. The Kim-Park method 34 has been used to determine E a from TG and derivative thermogravimetry (DTG) thermograms at various heating rates; the logarithm of the heating rate is plotted as a function of the inverse of T dm . The resulting equations can be expressed as follows:…”

Section: -31mentioning

confidence: 99%

Thermal decomposition behavior of carbon‐nanotube‐reinforced poly(ethylene 2,6‐naphthalate) nanocomposites

Kim

Park

Kim

2009

J of Applied Polymer Sci

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Polymer nanocomposites based on poly (ethylene 2,6-naphthalate) (PEN) and carbon nanotubes (CNTs) were prepared by direct melt blending with a twin-screw extruder. Dynamic thermogravimetric analysis was conducted on the PEN/CNT nanocomposites to clarify the effect of CNTs on the thermal decomposition behavior of the polymer nanocomposites. The thermal decomposition kinetics of the PEN/CNT nanocomposites was strongly dependent on the CNT content, the heating rate, and the gas atmosphere. On the basis of the thermal decomposition kinetic analysis, the variation of the activation energy for thermal decomposition revealed that a very small quantity of CNTs substantially improved the thermal stability and thermal decomposition of the PEN/ CNT nanocomposites. Morphological observations demonstrated the formation of interconnected or network-like structures of CNTs in the PEN matrix. The unique character of the CNTs introduced into the PEN matrix, such as the physical barrier effect of CNTs during thermal decomposition and the formation of interconnected or networklike structures of CNTs, resulted in the enhancement of the thermal stability of the PEN/CNT nanocomposites. V

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Characterization of thermal reaction by peak temperature and height of DTG curves

Cited by 76 publications

References 16 publications

Controlled thermo-catalytic modification of regenerated cellulosic fibres using magnesium chloride Lewis acid

Controlled thermo-catalytic modification of regenerated cellulosic fibres using magnesium chloride Lewis acid

Chemical oxidative polymerization, optical, electrochemical and kinetic studies of 8-amino-2-naphthol

Thermal decomposition behavior of carbon‐nanotube‐reinforced poly(ethylene 2,6‐naphthalate) nanocomposites

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