Cellulose nanocrystals are mechanically robust, rod-like nanoparticles with optical and mechanical properties dependent upon the chiral structure of the nanocrystals. Herein, we demonstrate tunable structural color and enhanced mechanical properties of CNC composites through the addition of naturally derived polymers. A controlled red-shift in peak wavelength is observed for all polymer additives, in which weight percentage of added polymer determines the shift in wavelength. The addition of the bio-polymer fillers also results in improved flexibility, and increased toughness and strength for CNC films. The mechanical properties of the composites demonstrate a reliance on the ratio of fillers, and the filler itself, within the composite rather than the total amount of fillers, allowing for greater control of mechanical response based on polymer fillers. The bio-polymer fillers provided a sustainable method of optical and mechanical enhancement for CNC chiral nematic films, utilizing filler weight percentage and ratios to control the desired composite response.

Cellulose nanocrystals combined with natural polymers for controllable iridescence and improved mechanical properties

2019 Spring National Meeting

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