Journal
CARBOHYDRATE POLYMERS
Volume 87, Issue 3, Pages 2068-2075Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2011.10.027
Keywords
Waterborne; Polyurethane; Cellulose; Nanocrystal; Reinforcement
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Funding
- Laboratory of Wood Science and Engineering, South China Agriculture University (SCAU)
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Biocompatible waterborne polyurethane (WPU) based on castor oil (CO)/polyethylene glycol (PEG) filled with low level loadings of Eucalyptus globulus cellulose nanocrystals (ECNs) was prepared. The ECNs obtained by sulfuric hydrolysis, consisted of 'rod-like' crystals with an average length and diameter of 518.0 +/- 183.4 nm and 21.7 +/- 13.0 nm, respectively. The nanocomposites with low level loadings of ECNs showed significant enhancement in tensile strength and Young's modulus from 5.43 to 12.22 MPa and from 1.16 to 4.83 MPa. respectively. SEM results showed well dispersion of ECNs in the WPU matrix. Furthermore, it was verified that the nanosized ECNs favored the hard-segments (HSs)/soft-segments (SSs) microphase separation of the WPU, causing shifts of the SS glass transition temperature (T-g,T-s) and the HS melting temperature (To) toward higher temperatures. (C) 2011 Elsevier Ltd. All rights reserved.
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