Journal
CARBOHYDRATE POLYMERS
Volume 95, Issue 1, Pages 91-99Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2013.02.023
Keywords
Polyurethane; Cellulose nanocrystals; Acetylation; Nanocomposites; Mechanical properties; Percolating network
Categories
Funding
- Program of New Century Excellent Talents, Ministry of Education of China [NCET-11-0686]
- Fundamental Research Funds for the Central Universities (Self-Determined and Innovative Research Funds of WUT) [2012-Ia-006]
- ecoENERGY Innovation Initiative of Canada
- Program of Energy Research and Development (PERD) of Canada
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New nanocomposites consisting of a castor oil-based polyurethane matrix filled with acetylated cellulose nanocrystals (ACNs) were developed. The ACN exhibited improved dispersion in tetrahydrofuran as a blending medium, and reduced polarity as compared with unmodified cellulose nanocrystals, resulting in a high loading level of 25 wt% in the nanocomposite. As the ACN loading-level increased from 0% to 25%, the tensile strength and Young's modulus of the nanocomposites increased from 2.79 MPa to 10.41 MPa and from 0.98 MPa to 42.61 MPa, respectively. When the ACN loading-level was 1 0 wt%, the breaking elongation of the nanocomposites reached the maximum value of more than twice that of the polyurethane. The enhanced mechanical performance was primarily attributed to the formation of a three-dimensional ACN network and strong interfacial interactions between filler and matrix. This work produced new polyurethane-based nanocomposites containing modified cellulose nanocrystal with a high biomass content. Its high performance could contribute to potential applications. Crown Copyright (C) 2013 Published by Elsevier Ltd. All rights reserved.
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