Journal
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
Volume 4, Issue 7, Pages 3766-3772Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.6b00415
Keywords
Cellulose nanofiber; Homogeneous dispersion; Interface; Silane coupling agent; Waterborne coating
Categories
Funding
- Program for New Century Excellent Talents in University [NCET-10-0313]
- Natural Science Foundation of Heilongjiang Province of China [JC2016002]
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Cellulose nanocrystal has been widely used as a reinforcement filler in waterborne coatings, but the application of cellulose nanofiber (CNF) as a filler is difficult because of inhomogeneous dispersion. Herein, a facile and effective strategy to improve the dispersion of CNFs in the polymer matrix by mixing with gamma-aminopropyltriethoxysilane (APS) is presented. The APS dosages 0.08-0.48 wt % to 0.3 wt % CNFs were investigated, and the dosage 0.16% was found to achieve a superior stability of CNFs in the aqueous solution. The APS(0.16%)-modified CNFs were then incorporated and demonstrated distributing uniformly in the waterborne acrylic coating. The as-prepared coatings retain high light transmittance around 90%, and display improved mechanical properties. The composite coatings show a maximum 500% improvement in Young's modulus, two-level improvement in hardness, and 35% reduction in abrasion loss as compared with those of neat coating. These results reveal that APS modification induces the homogeneous dispersion of CNFs in aqueous solution, and turns the CNF into an ideal reinforced filler for waterborne coatings.
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