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Resolution of molecular weight distributions in slightly pyrolyzed cellulose using the weibull functionAuthor(s): A. Broido; Hsiukang Yow
Source: Journal of Applied Polymer Science. 21(6): 1677-1685
Publication Series: Scientific Journal (JRNL)
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DescriptionEven before weight loss in the low-temperature pyrolysis of cellulose becomes significant, the average degree of polymerization of the partially pyrolyzed samples drops sharply. The gel permeation chromatograms of nitrated derivatives of the samples can be described in terms of a small number of mixed size populations—each component fitted within reasonable limits by a Weibull distribution function. The modal value of each component is taken as an integral multiple of a "macromonomer" of nominal degree of polymerization 228.4. Thus, the data are consistent with a model in which the degradation process is assumed to involve bond rupture at specific "weak links" into particularly favored molecular sizes. Such a mechanism provides a plausible alternative to the commonly assumed random breakdown along the length of the molecule.
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CitationBroido, A.; Yow, Hsiukang. 1977. Resolution of molecular weight distributions in slightly pyrolyzed cellulose using the weibull function. Journal of Applied Polymer Science. 21(6): 1677-1685.
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