Application of thermogravimetric techniques to reaction kinetics

Chatterjee, Pronoy K.

doi:10.1002/pol.1965.100031221

Cited by 31 publications

(23 citation statements)

References 8 publications

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“…Apart from the isoconversion methods a range of other methods for analysing activation energies have been proposed: the Freeman-Carroll [39] and Ellerstein methods [40], the Achar-BrindleySharp method [41] the Chatterjee method [42] and the temperature criterion method [4,43]. Characteristic of these methods is that they either assume that a particular kinetic model holds or that activation energies can be derived from a single experiment at one single heating rate.…”

Section: Other Activation Energy Analysis Methodsmentioning

confidence: 99%

The determination of activation energy from linear heating rate experiments: a comparison of the accuracy of isoconversion methods

2003

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Model-free isoconversion methods are the most reliable methods for the calculation of activation energies of thermally activated reactions. A large number of these isoconversion methods have been proposed in the literature. A classification of these methods is proposed. Type A methods such as Friedman methods make no mathematical approximations, and Type B methods, such as the generalised Kissinger equation, apply a range of approximations for the temperature integral. The accuracy of these methods is investigated, by deriving expressions for the main sources of error which includes the inaccuracy in reaction rate measurement, approximations for the temperature integral and inaccuracies in determination of temperature for equivalent fraction transformed. Both highly inaccurate and highly accurate Type B methods are identified. In cases where some uncertainty over baselines of the thermal analysis data exists or where accuracy of determination of transformation rates is limited, type B methods will often be more accurate than type A methods.

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Section: Other Activation Energy Analysis Methodsmentioning

confidence: 99%

The determination of activation energy from linear heating rate experiments: a comparison of the accuracy of isoconversion methods

2003

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“…The (44) but employs it without further refinement to calculate E at several C values. He sets up appropriate theoretical master·curves of (1-C) versus log <P [= log (AE//3R)p(x)] for, e.g., simple nth order reactions and for the random degradation of polyme rs Ceq (6)J for N ~ Land L = 2, 3, 4, and 5.…”

mentioning

confidence: 99%

“…After the determination of n , Chatterjee [44] s uggests dete rmining E from a single run by a difference-differential method. However, his method may be extended to apply to any j(W) 'i= W" since eq (62), for two or more runs at differe nt initial sample weights becomes…”

mentioning

confidence: 99%

“…Chatterjee [44] suggests using eq (64) to d etermin e the order of co mpetitive reac tion s by firs t calc ul ating Al and EI early in th e first reaction and s ubtractin g off th e portion of the rate (calc ulated from AI and EI ) due to the first reaction from the second and so on. When chan ge in n is du e to co mpe titiv e reactions this method may be applied only when th e orders of th e severa l reac ti ons are different [16] and th e rates of eac h s tep are proportional to a power of th e total weight of material.…”

mentioning

confidence: 99%

“…50 The practical me rits of the two methods may now be compared. The integral method [eq (44)] is simpler than the differential [eq (61)] method and quicker as it does not involve the determination of rates. However, no successive approximations are necessary for the differential method.…”

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General treatment of the thermogravimetry of polymers

Flynn

Wall

1966

J. RES. NATL. BUR. STAN. SECT. A.

1,884

779

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(Au gus t 1] , 1966)Theoreti ca l equ a ti o ns ar e de ve lo pe d for typi cal decompositions of polyme rs including th ose in whi c h the vola tilization does not folJ ow a simpl e "re action orde r" a nd those made up of a composite of seve ral reac tions of diffe rin g e ne rgies of ac tivation. The e ffects of orde r, activation ene rgy, heatin g ra te and te mpe ra ture de pe nd e nce upon th e calc ulated th ermogram s is illu strated. The lite rature on th ermogravim e tri c kine ti cs is c riti cally re vi ewed and coalesced into a logi cal and cohere nt de velopme nt stressin g the inte rrelation of me th ods a nd e mplo yin g a co ns iste nt sys te m of nota tion . As a res ult , a nu mbe r of impro ved me th ods and ne w me thod s for the a nalys is of kineti c data a ppli ca ble to th e co mpl e x sys te ms me nti oned a bove are developed . It is co nc lu de d th at me thods involvin g a va riabl e rate of hea tin g or invo lving seve ra l the rm ogra vime tri c traces at d iffe re nt ra tes of hea tin g a re capa bl e of es tabli s hing th e unique ness of kine ti c pa ra me te rs. A ne w me th od of de te rminjn g init ial pa ra me te rs from rate·conve rs ion data is de veloped . A novel co nce pt is e mpl oyed of programmin g reac ti on va ri a bles (i n thi s case, th e heatin g ra te) in a ma nne r whi c h great ly simplifies th e mathe mati cs of the kin e ti c s'ys te m and whic h shows pro mise of a wide ra nge of a pp lj ca bilit y in th e area of rate processes. Ke y Word s : Degrad a tion, no ni sothe rm al kine ti cs, polyme rs, pyrolys is, th e rm a l deco mp os iti o n, th e rmogra vim e try, th e rm olys is, sta bilit y of po lyme rs.

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Kinetic Study on the thermal degradation of anisolic resins

Shah

Desai

Mankad

1973

Angew. Makromol. Chem.

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Thermal behaviour of anisolic resinsis studied and an order of thermal stability of the investigated resins is observed. Thermal stability is found to be dependent upon the nature of the substituent present in the para position to the methoxy POUP.Kinetic parameters of the decomposition reactions are determined by CHATTER-JEE and REICH methods of analysis applied to the TG and DTA data. ZUSAMMENFASSUNG :Das thermische Verhalten von Anisolharzen wird untersucht ; die Harze lassen sich nach ihrer thermischen Stabilitiit in eine bestimmte Reihenfolge einordnen. Danach hiingt die thermische Stabilitiit von der Art des in p-Stellung zur Methoxy-Gruppe befindlichen Substituenten ab.Nach den Methoden von CHATTERJEE und von REICH wurden die kinetischenParameter der Zersetzungsreaktionen aus TG-und DTA-Daten ermittelt .

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Application of thermogravimetric techniques to reaction kinetics

Cited by 31 publications

References 8 publications

The determination of activation energy from linear heating rate experiments: a comparison of the accuracy of isoconversion methods

The determination of activation energy from linear heating rate experiments: a comparison of the accuracy of isoconversion methods

General treatment of the thermogravimetry of polymers

Kinetic Study on the thermal degradation of anisolic resins

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