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    Wood-inspired strategy to toughen transparent cellulose nanofibril films

    Year: 2021

    Journal: Carbohydr. Polym., Volume 259, MAY 1

    Authors: Zhou, Jie; Fang, Zhiqiang; Cui, Jinyi; Zhang, Xiao; Qian, Yong; Liu, Weifeng; Yang, Dongjie; Qiu, Xueqing

    Organizations: Natural Key R&D Program of China [2018YFD0400701]; National Natural Science Foundation of China [21978103, 22038004, 31700508]; Natural Science Foundation of Guangdong Province [2020B1515020021]; Pearl River S&T Nova Program of Guangzhou [201806010141]; Fundamental Research Funds for the Central Universities [2019MS083]

    Keywords: Cellulose nanofibril film; Wood-inspired strategy; Lignosulfonic acid; Toughness; Transparency

    The simultaneous attainment of high strength and high toughness of transparent cellulose nanofibril (CNF) film can expedite its uses in advanced applications. In this work, a wood-inspired strategy is proposed to address the conflict between strength and toughness by using natural derived lignosulfonic acid (LA) as a reinforcing additive. Only 1 wt% LA addition can double the toughness (11.0 +/- 1.3 MJ/m(3)) of pure CNF film. Consequently, the as-prepared CNF/LA-1 nanocomposite film not only exhibits superior mechanical properties (23.6 +/- 1.3 MJ/m(3) toughness, 249 +/- 6 MPa strength, and 15.4 +/- 1.4 % strain), but also maintains an excellent optical transparency of 91.2 % (550 nm). Furthermore, the mechanism for simultaneously enhancing strength and toughness is essentially attributed to the improved hydrogen bonding between CNF-OH and LA-SO3H and effective energy dissipation system. This work provides a green and effective approach to prepare strong yet tough and transparent biodegradable CNF film for high-end applications.
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