Journal
CARBOHYDRATE POLYMERS
Volume 225, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2019.115233
Keywords
Cellulose nanofibril; Waterborne polyurethane; Nanocomposites; Thermal stability; Mechanical properties
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Funding
- Collaborative R&D Program for Inter-Stream of Fiber and Textile Industry Technology Development Program [10070161]
- Ministry of Trade, Industry and Energy (MOTIE, Korea)
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We herein report the effects of carboxymethylated cellulose nanofibril (c-CNF) on the microstructure, thermal and mechanical properties of waterborne polyurethane (WPU)-based nanocomposite films. For the purpose, an aqueous dispersion of hard/soft segmented WPU with a mean particle size of similar to 169 nm was manufactured by using poly(propylene glycol), isophorone diisocyanate, 2,2-dimethylolpropionic acid and 1,4-butanediol. WPU nanocomposite films with 1-50wt% c-CNF loadings were then manufactured via an efficient casting method. The FT-IR spectra revealed the presence of hydrogen-bonding interactions between the urethane/urea groups of WPU hard segments and the carboxymethyl/hydroxyl groups of c-CNF. Accordingly, the thermal and thermo-oxidative stability of the nanocomposite films was noticeably enhanced by the introduction of c-CNF. In addition, the storage moduli of the nanocomposite films as well as the glass transition temperatures of WPU hard segments increased significantly with increasing the c-CNF content by similar to 7 owing to the specific interactions between c-CNF and WPU hard segments.
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