High cellulose nanowhisker content composites through cellosize bonding

Hossain, Kazi M. Zakir, Jasmani, Latifah, Ahmed, Ifty, Parsons, Andrew J., Scotchford, Colin A., Thielemans, Wim, and Rudd, Chris D. (2012) High cellulose nanowhisker content composites through cellosize bonding. Soft Matter, 8. pp. 12099-12110.

[img] PDF (Published Version) - Published Version
Restricted to Repository staff only

View at Publisher Website: https://doi.org/10.1039/c2sm26912k


Flexible composite films with a high cellulose nanowhisker (CNW) content of up to 75% by weight were produced by casting from aqueous solution with water soluble cellosize (CS). The surface topography of the films displayed an aggregated morphology influencing the surface roughness and light transparency properties of the blends. Using fluorescently labelled CS, we were able to determine the extent of aggregation in the composites which indicated that up to 13% of CNWs can be homogeneously blended with CS, above which larger CNW aggregates occur. However, even in a somewhat aggregated form, the CNWs still form a percolated network and appear to be homogeneously dispersed as larger aggregated entities. The composite CNW-CS films further exhibited improved thermal stability compared to both the CNWs and CS alone with decomposition temperatures shifting from 261 degrees C for CNWs and 313 degrees C for CS to 361 degrees C for blends containing 75% CNWs. Surface induced crystallisation of CS by CNWs was also found with higher crystallinity for the composite films than for the individual constituents. Due to the reinforcing effect of CNWs within the matrix, an increase in the tensile strength (294%) and modulus (2004%) was observed for the blend containing 75% CNWs compared to the pure CS film (tensile strength similar to 12.23 MPa and modulus similar to 0.39 GPa). The storage modulus of all the flexible blends/films investigated also revealed an increasing trend with the CNW content across the temperature region explored. The swelling kinetics of the CNW-CS blends in phosphate buffered saline (PBS) media at 37 degrees C were also investigated and CNWs were shown to have a strong influence on reducing the equilibrium swelling capacity and initial swelling rate of the blends.

Item ID: 57989
Item Type: Article (Research - C1)
ISSN: 1744-6848
Copyright Information: © The Royal Society of Chemistry 2012
Date Deposited: 17 Apr 2019 09:23
FoR Codes: 09 ENGINEERING > 0912 Materials Engineering > 091202 Composite and Hybrid Materials @ 100%
SEO Codes: 86 MANUFACTURING > 8608 Human Pharmaceutical Products > 860899 Human Pharmaceutical Products not elsewhere classified @ 100%
Downloads: Total: 1
Last 12 Months: 1
More Statistics

Actions (Repository Staff Only)

Item Control Page Item Control Page