Multi-Modal Melt-Processing of Birefringent Cellulosic Materials for Eco-Friendly Anti-Counterfeiting
writer：Xinkai Li, Xiaoyan Qiu, Xin Yang, Peng Zhou, Quanquan Guo, and Xinxing Zhang*
keywords：birefringence, cellulosic materials, dynamic covalent network, multi- modal melt-processing, programmable anti-counterfeiting, recyclability
source：期刊
Issue time：2024年
Ubiquitous anti-counterfeiting materials with a rapidly rising annual
consumption (over 1010 m2)can pose a serious environmental burden.
Biobased cellulosic materials with birefringence o?er attractive sustainable
alternatives, but their scalable solvent-free processing remain challenging.
Here, a dynamic chemical modi?cation strategy is proposed for multi-modal
melt-processing of birefringent cellulosic materials for eco-friendly
anti-counterfeiting. Relying on the thermal-activated dynamic covalent-locking
of the spatial topological structure of preferred oriented cellulose, the strategy
balances the contradiction between the strong con?nement of long-range
ordered structures and the molecular motility required for entropically-driven
reconstruction. Equipped with customizable processing forms including
mold-pressing, spinning, direct-ink-writing, and blade-coating, the materials
exhibit a wide color gamut, self-healing e?ciency (94.5%), recyclability, and
biodegradability. Moreover, the diversi?ed ?exible elements facilitate scalable
fabrication and compatibility with universal processing techniques, thereby
enabling versatile and programmable anti-counterfeiting. The strategy is
expected to provide references for multi-modal melt-processing of cellulose
and promote sustainable innovation in the anti-counterfeiting industry.