Journal
POLYMER JOURNAL
Volume 43, Issue 6, Pages 559-564Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/pj.2011.31
Keywords
All-cellulose nanocomposite; cellulose nanofiber; mechanical properties
Categories
Funding
- Ministry of Education, Culture, Science, Sports and Technology, Japan [20246100]
- MEXT, Japan
- Iranian Ministry of Science
- Grants-in-Aid for Scientific Research [20246100] Funding Source: KAKEN
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All-cellulose composite (ACC) and nanocomposite (ACNC) were, respectively, made from microfiber and grinding-based nanofiber of canola straw by using a partial dissolution method with the solvent N,N-dimethylacetamide/lithium chloride (DMAc/LiCl). The dissolution times were 5, 10, 20, 30, 60 and 120 mins. The resultant composites were compared with neat micro-and nanofiber sheets. The average diameter of microfiber was 26 mu m, which was downsized to 32nm after grinding. The grinding process is a simple, cheap and fast downsizing method that could reduce fiber diameter by almost three orders of magnitude. The tensile strength of the nanofiber sheet was 11 times higher than that of the microfiber sheet. As dissolution time increased, the amount of non-crystalline matrix in the ACC and ACNC increased, and the apparent crystallinity decreased. The ACC had a tensile strength of 59 MPa when the dissolution time was 120 min, whereas the ACNC approached a maximum tensile strength of 164 MPa after a short dissolution time (10 min). Fiber pull-out was observed in the tensile-broken surfaces of the micro-and nanofiber sheets, and fibers tended to break when the dissolution time was long. Polymer Journal (2011) 43, 559-564; doi:10.1038/pj.2011.31; published online 20 April 2011
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