Thermal degradation of model compounds with blocked hemiacetal group related to (4-O-methyl-D-glucurono)-D-xylan

Simkovic, I; Hirsch, Ján; Ebringerová, Anna; Königstein, Jozef

doi:10.1002/app.1987.070330503

Cited by 10 publications

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“…Sawdust sample crosslinked with epichlorhydrin (sample 5 ) had LO1 = 35.8 vol. ?6 of oxygen while the BS-E-PEI sample ( 6 ) had LO1 = 24.7 vol. % of oxygen.…”

Section: Resultsmentioning

confidence: 99%

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Flame retardancy effect of crosslinking of lignocellulose materials

Simkovic

Pastýr

Csomorová

et al. 1990

J of Applied Polymer Sci

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SynopsisDynamic and isothermal thermogravimetry (TG) was used for the study of flame retardancy effects caused by crosslinking of lignocellulose materials. This effect was also checked with the limited oxygen index (LOI) method. It was found that dynamic TG measurements run to 400°C could indicate the decrease of flame retardancy effect when lower residues are observed for samples measured in oxidative in comparison to inert environments. The isothermal TG data of initial reactions are not suitable for the prediction of flame retardancy effects. Epichlorhydrin ( E ) is a suitable chemical for the flame retardancy of wood. The addition of polyethyleneimine (PEI) decreases the flame retardancy of wood. On the other hand xylan crosslinked with E gives lower LO1 values than the xylan crosslinked in the presence of PEL

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“…Sawdust sample crosslinked with epichlorhydrin (sample 5 ) had LO1 = 35.8 vol. ?6 of oxygen while the BS-E-PEI sample ( 6 ) had LO1 = 24.7 vol. % of oxygen.…”

Section: Resultsmentioning

confidence: 99%

“…The difference between the values obtained in inert and oxidative conditions is smallest for the sample that is most stable against thermooxidation. From the values of activation energy the thermooxidative stability increases in the sequence: ( 6 ) had LO1 = 24.7 vol. % of oxygen.…”

Section: Values Of Rate Constants (Min-') and Activation Energies (Kjmentioning

confidence: 99%

Flame retardancy effect of crosslinking of lignocellulose materials

Simkovic

Pastýr

Csomorová

et al. 1990

J of Applied Polymer Sci

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Neuere Ergebnisse zur Isolierung, Modifizierung und Anwendung von Xylanen (Literaturbericht)

Stscherbina¹,

Philipp²

1991

Acta Polymerica

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Neuere Ergebnisse zur Isolierung, Modifizierung (Literaturbericht) D. STSCIKERBIXA tltlci rj. PIIILIPP und Anwendung Actr Polymsrica 42 (1991) Nr. 8 345 von Xylanen Institiit fur I'olynicrenchcmie ,,Ericli Corrcns", 0-1530 Teltow-SccliofEs wird ein vberblick iiber die seit Anfang der 70er Jahre erschiencncn Arbeiten zu Isolierung und Strukturaufklzrung von Xylanen iius Hijlzern uncl Einjaltrcspflnnzcn, ihre chemisehe hlotlilizierirng einsclilielllicli Bbbau sowie die Anwendung von Xylnnen und ilircn Derivatcn gegeben. New restills on isolation, modification and application of mjlans (Literature review)A review of recent work since about 1970 is presented on the isolation of xylans from wood and annual plants as well as o n the elucidation of structure of these polysaccharidcs and especially on alkylation, acylation and degradation of tlicse pnlymrrs. Recents roots to appliration of xylans are also discussed.

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Thermogravimetric/mass spectrometric characterization of the thermal decomposition of (4‐O‐methyl‐D‐glucurono)‐D‐xylan

Simkovic

Várhegyi

Antal

et al. 1988

J of Applied Polymer Sci

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SynopsisA thermogravimetric/mass spectrometric (TG/MS) system was used to characterize the thermolysis reactions of (4-O-methyl-D-g~ucurono)-D-xy~an. The mass spectrometric peaks, measured as function of time, were attributed to water, methanol, carbon monoxide, carbon dioxide, formaldehyde, formic acid, acetic acid, acetone, acrolein, 2-furaldehyde, and 3-hydroxy-2-penteno-1,5-lactone. The time derivative of the thermogravimetric curve (DTG) consisted of two partially overlapping peaks, indicating a multistep mechanism. The mass spectrometric intensities of the peaks assigned to methanol and 2-furaldehyde coincided with the first DTG peak, suggesting that the first DTG peak represents both dehydration and fragmentation pathways. Methanol, water, formyl group, and carbon dioxide contributed to both of the DTG peaks. This indicates that the dehydration, decarboxylation, and decarbonylation took place in two steps. The compounds observed only in the second DTG peak and later (acetone, formic acid, formaldehyde, acrolein, acetic acid, and 3-hydroxy-2-penteno-1,5-lactone) are probably products of reactions which occur after the collapse of the original polysaccharide structure.

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Thermal degradation of model compounds with blocked hemiacetal group related to (4-O-methyl-D-glucurono)-D-xylan

Cited by 10 publications

References 0 publications

Flame retardancy effect of crosslinking of lignocellulose materials

Flame retardancy effect of crosslinking of lignocellulose materials

Neuere Ergebnisse zur Isolierung, Modifizierung und Anwendung von Xylanen (Literaturbericht)

Thermogravimetric/mass spectrometric characterization of the thermal decomposition of (4‐O‐methyl‐D‐glucurono)‐D‐xylan

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