Relationship between structural characteristics of cellulose nanocrystals obtained from kraft pulp

María Graciela Aguayo*, Arturo Fernández-Pérez, Claudia Oviedo, Guillermo Reyes, Pablo Reyes-Contreras

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

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Abstract

Kraft pulp cellulose was hydrolyzed using sulfuric acid, under different thermophysical conditions of temperature, time, pulp concentration, and sonication time. The experimental design revealed the effect of these conditions and their interaction on the hydrolysis yield obtained. In addition, the top five cellulose nanocrystals (CNCs) yields from this experiment design were analyzed. The results obtained indicated that CNCs possess a morphology that can be described as individualized rod particles, with average diameters less than 50 nm and different size distribution. In the analysis of CNCs features, significant Pearson correlations were established between the crystallinity of the CNC, CNC yield, and interplanar crystallites distance (∆d/d). The thermogravimetric (DTG) profiles exhibited two CNCs degradation stages, where the second stage CNCs degradation showed a significative correlation with CNC sulfur content. In our analysis, the crystallographic parameters exhibited a correlation with the mechanical behavior of the CNC, since the potential variation between the distances of the crystalline planes is related to the stress and deformation present in the crystallites of CNCs. This study provides new knowledge regarding CNCs, further enhancing information for CNC-based industries and the processability of CNCs for the development of new materials.

Original languageEnglish
Article number1775
Number of pages15
JournalNanomaterials
Volume10
Issue number9
DOIs
Publication statusPublished - Sep 2020
MoE publication typeA1 Journal article-refereed

Keywords

  • Cellulose nanocrystals
  • Characterization techniques
  • CNC characterization
  • Kraft pulp

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