Accurate molar masses of cellulose for the determination of degradation rates in complex paper samples
Auteur ou éditeur
Bégin, Paul
Tétreault, Jean
Dupont, Anne-Laurence
Réau. Denis
Paris-Lacombe, Sabrina
Mortha, Gérard
Date de publication
15 December 2018
Collation
172-185
Titre de la source
Carbohydrate Polymers
Numéro de la source
vol. 202
Résumé
Complex cellulosic samples are often difficult to analyse with size-exclusion chromatography. The strong molecular associations of hemicelluloses and lignin with cellulose produce multimodal molar mass distributions (MMD) that are difficult to interpret. More reliable ways of calculating the molar masses of cellulose are thus necessary. This is particularly relevant when studying the kinetics of paper degradation, as the number average molar mass is the most precise indicator. In this study various data handling methods based on the deconvolution of bimodal and multimodal MMDs of complex cellulosic samples after SEC-MALS-DRI analysis are examined in order to propose more accurate paper degradation rates. Two deconvolution methods, which do or do not rely on polymer calibration curves were developed and were applied to several kraft and groundwood pulp papers unaged and hygrothermally aged. The deconvolution methods are discussed and evaluated in light of calculated cellulose activation energies, degradation rates and paper usable lifetime predictions.
Langue
English = Anglais
ISBN/ISSN
01448617
Pays
Netherlands
Type de document
Journal Article = Article de périodique
Localisation
# 16648 (For internal use only = Pour usage interne seulement)
