Influence of fine structure on the pyrolysis of cellulose. III. The influence of orientation

Abstract

The effects of orientation upon the pyrolysis of cellulose were investigated by using a series of rayon fibers which differed only in orientation. The initial weight loss seen in low‐temperature vacuum pyrolysis is due to crosslinking in the less ordered regions and was shown to be a first‐order reaction whose rate varies directly with the degree of orientation. The extent of this reaction decreases with increasing orientation and is directly related to the amount of char formed at higher temperatures. The bulk pyrolysis rate increases with increasing orientation. DSC, air pyrolysis rates, and levoglucosan formation were also studied.

X-ray diffraction, IR spectroscopy and thermal characterization of partially hydrolyzed guar gum

“…Exothermic peak shown in DSC curve corresponds to ongoing thermal and oxidative decomposition of the polymer, vaporization and elimination of volatile products [16,17]. Pyrolysis of polysaccharides initiates by random breakdown of glycosidic bonds, followed by further decomposition [18,19]. The wide decomposition peak of GG at 253 • C could be due to cleavage of galactose and mannose units from GG backbone.…”

Biomass pyrolysis kinetics: A comparative critical review with relevant agricultural residue case studies

“…lulose pyrolysis can be influenced by several structural elements, including the DP, crystallinity, orientation, and accessibility of the sample [234,251,253].…”

Thermogravimetric and dynamic mechanical thermal analysis of pineapple fibre reinforced polyethylene composites

“…In the case of cellulose fibres, lignin degradation sets in at around 200~ and other polysaccharides mainly cellulose are oxidized and degraded at higher temperatures [1]. Most natural fibres lose their strength at about 160~ Thermal analysis studies of cellulose fibres have been carried out and the effects of crystallinity, orientation and crosslinking on the pyrolytic behaviour of cellulose have been reported [2][3][4][5].…”