Heterogeneity in cellulose pyrolysis indicated from the pyrolysis in sulfolane

Kawamoto, Hiroyuki; Saka, Shiro

doi:10.1016/j.jaap.2005.12.011

Cited by 45 publications

(26 citation statements)

References 15 publications

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“…The data also suggest that in the case of PEO, the depolymerization proceeds such that the DP asymptotically approaches the time axis after a prolonged period of non-isothermal degradation. This behaviour is in contrast to that of other polymers, such as cellulose, where the DP is observed to approach a non-zero value and persist at that value after a prolonged period of degradation [19,[42][43][44][45][46].…”

Section: Resultscontrasting

confidence: 81%

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Non-isothermal depolymerisation kinetics of poly(ethylene oxide)

Cran¹,

Gray²,

Scheirs³

et al. 2011

Polymer Degradation and Stability

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The depolymerization of low molecular weight poly(ethylene oxide) (PEO) under mild conditions was studied using a linear temperature ramped non-isothermal technique and the results compared with those obtained from a conventional isothermal technique. The analysis of the non-isothermal kinetic (NIK) data was performed using an original computer program incorporating an algorithm that systematically minimizes the sum of the squares of the residuals between the experimental data and the calculated theoretical kinetic profile in order to extract the kinetic parameters. The results revealed that the depolymerization of PEO proceeds in accordance with the Ekenstam model and follows the Arrhenius equation over the temperature range of ca. 40 to 130C. The NIK analysis resulted in a two-dimensional convergence to produce a unique solution set for the kinetic parameters of E a = 89.4 kJ mol -1 and A = 9.6  10 6 h -1 . These data are consistent with the results obtained from the isothermal experiments. It is proposed that NIK analysis is a quick and reliable means of obtaining kinetic parameters relevant to lifetime predictions in polymers whose degradation behaviour can be considered to be close to ideal.

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Section: Resultscontrasting

confidence: 81%

“…Unfortunately, this is not what is observed in the case of, say, cellulose which forms stable oligomers after prolonged degradation and the DP tends towards a persistent value of ca. 200 corresponding approximately to the crystallite size [19,[42][43][44][45][46].…”

Section: Isothermal and Non-isothermal Kineticsmentioning

confidence: 99%

Non-isothermal depolymerisation kinetics of poly(ethylene oxide)

Cran¹,

Gray²,

Scheirs³

et al. 2011

Polymer Degradation and Stability

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“…In early X-ray diffraction investigations, Taniguchi and Nakato [40] and Chow and Pickles [24] reported a study of thermal decomposition of wood cellulose but the detailed pathways of degradation were not clarified. In a recent in-situ study, Kim et al performed X-ray investigations at 320°C and proposed an anisotropic A c c e p t e d M a n u s c r i p t 4 decomposition mechanism of wood cellulose under isothermal conditions [41], which was confirmed by Kawamoto and Saka [42].…”

Section: Introductionmentioning

confidence: 87%

In situ X-ray diffraction investigation of thermal decomposition of wood cellulose

Zickler

Wagermaier

Funari

et al. 2007

Journal of Analytical and Applied Pyrolysis

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The kinetics of thermal decomposition of crystalline cellulose in spruce wood (Picea abies [L.] Karst.) was studied by in-situ X-ray diffraction using synchrotron radiation. Fiber diffraction patterns resulting from the crystal lattice of native cellulose arranged in oriented microfibrils were collected as a function of heat treatment time for various temperatures from 300 to 360°C. Sample heating was performed using a specially designed in-situ pyrolysis A c c e p t e d M a n u s c r i p t 2 meridional diffraction peaks. By quantitatively analyzing the kinetics for different temperatures it is found that thermal decomposition of crystalline cellulose in wood occurs mainly via a thermally activated decrease of the fibril diameter and an estimate for the activation energy is obtained. A simple scheme about the structural degradation of cellulose is presented.

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“…Moreover, thermal stability and heat resistance also have a close relationship with the crystallinity degree. In particular, crystalline regions in cellulose are much more stable than amorphous parts in cellulose [34][35][36] . Therefore, increase of crystallinity degree during chemical treatment also improved the heat resistance of PCNF and CNF_TiO 2 samples.…”

Section: Characterization Of Pure Cellulose Nanofibers and The Nanmentioning

confidence: 99%