Relaxation nature of thermal degradation of polymers

Zadorina, Ye.N.; Vishnevskii, G.Ye.; Zelenev, Yu. V.

doi:10.1016/0032-3950(81)90352-x

Cited by 5 publications

(8 citation statements)

References 8 publications

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“…Figure 2 represents examples of graphically determined limit temperature from the data in [4]. As seen from the figure, the limit temperatures are reached with the polymers in the examples at heating rates as low as 2... 6 degree/s.…”

Section: Cooo(t) = Lim Co(t T) T--*~mentioning

confidence: 95%

“…It was stated, however, [3,12] that the values E, k 0 and n chosen for one TG curve will not be fit to describe a TG curve obtained at some other heating rate. A triade of E, k0 and n values corresponds to each heating rate [4]. Particularly sharp differences are characteristic for thermoactive polymers and natural coals [12].…”

Section: Difficulties In Describing the Kinetics Of Thermal Decomposimentioning

confidence: 99%

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Thermal decomposition of polymeric materials: Characteristics of kinetics at non-isothermal heating

Shlensky

1983

Journal of Thermal Analysis

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General conclusions are made based on the results of experimental and theoretical investigations of the decomposition kinetics of various polymeric materials in a wide range of heating rates. It was found that the decomposition process of the investigated materials proceeds within confined temperature intervals. Kinetic equations are suggested to describe the thermal decomposition processes of polymers and natural coals, based on the characteristic revealed. Thermal decomposition ranges of polymeric materialsThe thermal decomposition kinetics of polymeric materials with different chemical compositions and natural coals have been studied in a wide range of heating rates b = dT/dt by DTA [1][2][3]. They demonstrated that each material investigated has a characteristic temperature range in which the thermal decomposition process takes place. Figure 1 represents the typical position of TG curve groups in these ranges, and the limits are marked by lines. The lower limit cooo(7-) corresponds to the hypothetical conditions of equilibrium heating. The ordinates of the curve co~(T) are determined for each fixed temperature T as the asymptotical limit of co=(T):where co is the relative mass of sample residue = M/M 0 and t is the observation time of the sample at monotonous heating.The curve cooo(T) characterizes the observation results at the lowest heating rates allowing to establish the chemical equilibrium between the starting material and the decomposition products. In practice, the points of the lower limit are obtained by means of a series of isothermal studies of the material up to the total stop of mass loss at each given temperature. The characteristic points of the lower limiting curve are the

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Section: Cooo(t) = Lim Co(t T) T--*~mentioning

confidence: 95%

Section: Difficulties In Describing the Kinetics Of Thermal Decomposimentioning

confidence: 99%

Thermal decomposition of polymeric materials: Characteristics of kinetics at non-isothermal heating

Shlensky

1983

Journal of Thermal Analysis

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“…So fuhrt z. B. das Anlegen eines linearen Hochtemperaturfeldes, das auf das Polymersystem mit einer Geschwindigkeit von 0,083 bis 400 K * s-l einwirkt, zu einer Reaktion der Strukturelemente, welche die Temperatur des Abbaubeginns des Polymers unter diesen Bedingungen bestimmt [3]. Folglich kann man fur einen bestimmten Bereich der Parameter des auBeren Feldes von einer entscheidenden Rolle der ubermolekularen Struktur der Polymere sprechen, die trotz unterschiedlicher molekularer Struktur Bhnlichkeiten im Charakter des Ablaufs verschiedener physikalischer Prozesse bewirkt.…”

Section: Einfuhrungunclassified

“…However, both the surface acceptance potential as well as the retentivity of surface charge (i.e., rate of charge decay a t room temperature) depend very much on the thickness of the layers [3]. The present investi-400 1 t I…”

Section: Introductionmentioning

confidence: 99%

Einfluß der thermischen Vorbehandlung auf die Änderung der Eigenschaften von Polymermischungen

Loev

Zadorina²,

Zelenev

1989

Acta Polymerica

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Die physikalische Modifizierung von Polymeren unterschiedlicher Klassen durch thermische Behandlung wird mit Hilfe einer mehrparametrigen Zustandsgleichung beschrieben. Die Ergebnisse einer Untersuchung des Einflusses der thermischen Behandlung von Polymeren bei kontinuierlicher und stufenweiser Erwarmung und Abkuhlung werden diskutiert. Bmmnue mepmwecxoii npeabrcmopuu na umenenue csoiicme noAmepnbrx iEoMnoauyuii c I I O M O Q b K l MHOl'OllapaMeTpOl'O YpaBHeHMII COCTOHHHII OllMCaHa (PM3H9eCKaH MOJJM(PHKaJ&TH TepMHqeCKO& o6pa-B O T K O~ IIOJIHMepOB pa3JIM9HOrO pOJJa. O~C~H ( A~I O T C R pe3yJIbTaTbI MCCJIeJJOBaHHII TepMHYeCKO& o 6 p a 6 o~~~i nOJIHMepOB IIpM HeIIpepbIBHOM M CTyneHWiTOM HaFpeBaHHH M OXJIaH(JJeHHM. Effect of thermal processing on the change of properties of polymer blendsThe physical modification of polymers of different classes b y means of thermal processing is described using a multiparameter equation-of-state. The results of the study of the influence of thermal processing on polymers a t continuous and stepwise heating and cooling is discussed.

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“…To estimate the characteristic temperatures of thermal breakdown of polymers, we used experimental data obtained elsewhere [6][7][8]. The results were obtained on different thermoanalytical analysis instruments.…”

mentioning

confidence: 99%

Assessing the Characteristic Temperatures of Thermal Breakdown of Polymers by Thermal Analysis Methods

Tuinova

Yakushev

2009

International Polymer Science and Technology

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Relaxation nature of thermal degradation of polymers

Cited by 5 publications

References 8 publications

Thermal decomposition of polymeric materials: Characteristics of kinetics at non-isothermal heating

Thermal decomposition of polymeric materials: Characteristics of kinetics at non-isothermal heating

Einfluß der thermischen Vorbehandlung auf die Änderung der Eigenschaften von Polymermischungen

Assessing the Characteristic Temperatures of Thermal Breakdown of Polymers by Thermal Analysis Methods

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