Cinnamate‐Functionalized Cellulose Nanocrystals as UV‐Shielding Nanofillers in Sunscreen and Transparent Polymer Films

Zhen Zhang, Boya Zhang, Nathan Grishkewich, Richard Berry, and Kam C. Tam

Cinnamate‐Functionalized Cellulose Nanocrystals as UV‐Shielding Nanofillers in Sunscreen and Transparent Polymer Films

ABSTRACT

Sustainable and environmentally friendly UV‐shielding materials offer new opportunities in the formulation of the next generation cosmetic products. Cinnamate‐functionalized cellulose nanocrystals (Cin‐CNCs) prepared by esterifying CNCs with cinnamoyl chloride display strong UV absorption and high visible light transmittance. They are suitable for use as UV‐shielding nanofillers for sunscreen and transparent polymer films. The aqueous Cin‐CNC dispersion is waterborne, alcohol‐free, nonwhitening, waterproof, photo‐stable, and possesses a high sun protection factor (SPF). The SPF of Cin‐CNC aqueous dispersion is more than twice that of a popular commercial sunscreen at similar concentration. The Cin‐CNCs can serve as UV‐shielding and reinforcing nanofillers in hydrophilic and hydrophobic polymer matrices. The polyvinyl alcohol and polystyrene films incorporated with Cin‐CNCs display excellent UV‐shielding capacity and their Young's moduli are significantly enhanced.


Language English
Journal Advanced Sustainable Systems
Year
2019
Article number 1800156
Volume 3
Issue number
4
Status published

 

KEYWORDS

cellulose nanocrystals, cinnamate, polymer films, sunscreen, UV-shielding


DOI: 10.1002/adsu.201800156

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Zhen Zhang, Boya Zhang, Nathan Grishkewich, Richard Berry, Kam C. Tam. Cinnamate‐functionalized cellulose nanocrystals as uv‐shielding nanofillers in sunscreen and transparent polymer films. Advanced Sustainable Systems, 2019, 3(4), 1800156.

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