Modeling the Endothermic Decomposition of Hydrated Solids

Staggs, J.E.J.

doi:10.1016/b978-0-444-53808-6.00010-x

Cited by 4 publications

(4 citation statements)

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“…Therefore, in this study, the decomposition kinetic of prepared xerogels was analyzed to achieve some comparable parameters. The n th order Arrhenius rate equation defined as relation () 49 :

H \frac{normald μ}{normald T} = - A {(μ - μ_{s})}^{n} \exp ((), - \frac{T_{A}}{T}) .

…”

Section: Resultsmentioning

confidence: 99%

“…ΔT K can be calculated by ΔT K = T 1 – T 2 . The determination of T 1 and T 2 by considering of tangent drown on TG curve is explained in Reference 49. For known reaction order, n , the characteristic kinetic and the Arrhenius parameters can be determined from the solutions of the Equations ) and ():

1 - N_{k} e^{N_{k}} E_{1} ((), N_{k}) = {φ_{n}}^{{ΔT}_{k} / T_{k}},

\frac{A}{H} = 2^{n} e^{N_{k}} / {(1 - μ_{s})}^{n} {ΔT}_{k} .

…”

Section: Resultsmentioning

confidence: 99%

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Microstructural properties, thermal insulation and thermal degradation behavior of boron‐containingmonolithic novolac xerogels

Seraji

Ahmad

2020

J of Applied Polymer Sci

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Enhancement of thermal stability‐insulation performance of hyper porous materials is the premier issue to design of novel porous thermal protection systems. Boron‐containing monolithic novolac xerogels (BCNXs) were synthesized using sol–gel networking of novolac resin with hexamethylenetetramine (HMTA) and boric acid at the solvent saturated vapor atmosphere (SSVA). The aim was to elucidate the effect of higher crosslinking density and thermal stable boron containing chemical bonds on the microstructure, thermal conductivity, and thermal oxidation stability of novolac xerogels. The results of FESEM and BET analysis showed that the microstructural characteristics of xerogels are significantly depend on the HMTA and boric acid concentration. The thermogravimetric results were analyzed using characteristic kinetic temperature (CKT)‐characteristic kinetic temperature range (CKTR) approximations. The effect of micromorphology of xerogels on the thermal conductivity was investigated. The effective thermal conductivity of samples were in the range of 0.031–0.048 W/m K.

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“…Therefore, in this study, the decomposition kinetic of prepared xerogels was analyzed to achieve some comparable parameters. The n th order Arrhenius rate equation defined as relation () 49 :

H \frac{normald μ}{normald T} = - A {(μ - μ_{s})}^{n} \exp ((), - \frac{T_{A}}{T}) .

…”

Section: Resultsmentioning

confidence: 99%

1 - N_{k} e^{N_{k}} E_{1} ((), N_{k}) = {φ_{n}}^{{ΔT}_{k} / T_{k}},

\frac{A}{H} = 2^{n} e^{N_{k}} / {(1 - μ_{s})}^{n} {ΔT}_{k} .

…”

Section: Resultsmentioning

confidence: 99%

Microstructural properties, thermal insulation and thermal degradation behavior of boron‐containingmonolithic novolac xerogels

Seraji

Ahmad

2020

J of Applied Polymer Sci

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“…An obvious candidate here is a hydrated mineral filler, such as alumina trihydrate or magnesium hydroxide, which liberates water on heating, consuming energy in the process. The dynamics of endothermic thermal degradation of hydrated materials specifically have been investigated previously in [ 22 ] and so in this contribution the general behaviour of a heat-sink additive is discussed.…”

Section: Reactive Sacrificial Additivesmentioning

confidence: 99%

“…However a more intuitive, but equally valid, characteristic temperature is the temperature at which half of the reactant has been consumed. This is defined as the characteristic kinetic temperature (CKT) , which will be denoted by T 1/2 [ 22 , 23 ]. The temperature at inflexion and T 1/2 are shown in Figure 1 and it transpires that these are always close together.…”

Section: Reactive Sacrificial Additivesmentioning

confidence: 99%

Important Parameter Groups in Thermal Protection of Polymers

Staggs¹

2015

Materials

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The problem of thermal protection is explored for two idiosyncratic reactive systems, namely a sacrificial heat-sink material and an intumescent system where a dynamically evolving insulation layer is produced from an initially thin coating. Relatively simple mathematical models of both systems are proposed that encompass the important physical characteristics of each situation and these models are analysed using a mixture of numerical and analytical techniques. Important dimensionless parameter groups are identified and domains of parameter space where thermal performance is particularly good- or particularly bad- are identified.

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