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    Thermally-induced cellulose nanofibril films with near-complete ultraviolet-blocking and improved water resistance

    Year: 2019

    Journal: Carbohydr. Polym., Volume 223, NOV 1

    Authors: Yang, Weisheng; Gao, Ying; Zuo, Chu; Deng, Yulin; Dai, Hongqi

    Organizations: introduction of Advanced International Project of Forestry Science and Technology [2015454]; National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [31470599]; Doctorate Fellowship Foundation of Nanjing Forestry University

    Keywords: Thermal treatment; Cellulose nanofibril films; UV protection; Water resistance; Transparency

    In recent years, ultraviolet (UV) protection films made from cellulose nanofibril (CNF) have drawn significant attention, owing to its high transparency, high mechanical strength and relatively high thermostability. Generally, CNF films had poor UV-shielding performance, and required UV absorbent to enhance their UV-shielding ability. Herein, a simple thermal treatment is proposed to directly improve the UV blocking properties of CNF films without incorporating UV absorbent. After thermal treatment at 160 degrees C, the CNF films exhibited a near-complete UV blocking ability. In particular, they exhibited full absorption of ultraviolet A (UVA) and ultraviolet B (UVB), and also showed a high visible light transmittance of 72%. In addition, the UV-shielding films performed stable UV-blocking when exposed to UV irradiation. Simultaneously, the hornification induced by thermal treatment endowed an improved hydrophobicity for CNF films. However, the tensile strength of the CNF films decreased from 133 MPa to 81 MPa after thermal treatment at 160 degrees C.
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