Guangxi Key Laboratory of Clean Pulp & Papermaking and Pollution Control, College of Light Industry and Food Engineering, Guangxi University, Nanning 530004, PR China; Beijing Key Laboratory of Lignocellulosic Chemistry, Beijing Forestry University, Beijing 100083, PR China.
Guangxi Key Laboratory of Clean Pulp & Papermaking and Pollution Control, College of Light Industry and Food Engineering, Guangxi University, Nanning 530004, PR China.
Carbohydr Polym. 2022 Nov 15;296:119938. doi: 10.1016/j.carbpol.2022.119938. Epub 2022 Aug 4.
Generally, the thermal conductivity (TC) of composite based on cellulose nanofibrils (CNF) is improved by adding thermal conductive filler, which inevitably leads to the loss of its mechanical properties. In this work, it is the first to simultaneously improve the toughness and TC of CNF/boron nitride nanosheets (BNNS) composite from the perspective of thermal conductive filler addition and CNF crystal change. The hydrophilic-modified BNNSs were successfully prepared by xylose-assisted ball-milling prior to adding into CNF. Compared with that of CNF film (1.34 W/(m·K)), the in-plane TC of CNF/BNNS composite (12.68 W/(m·K)) increased significantly by 846 % with loading 30 % BNNS. Afterwards, both toughness (8.0 MJ·m, increased ~250 %) and TC (14.7 W/(m·K), increased ~16 %) of CNF/BNNS composite were further enhanced significantly by mercerization with 12.5 % NaOH solution. The simultaneously improvement of toughness and TC is unprecedented in related studies, which contributes to the effective preparation of thermal management materials.
通常，通过添加导热填料可以提高基于纤维素纳米纤维（CNF）的复合材料的热导率（TC），但这不可避免地导致其机械性能的损失。在这项工作中，首次从导热填料添加和 CNF 晶体变化的角度出发，同时提高了 CNF/氮化硼纳米片（BNNS）复合材料的韧性和 TC。在加入 CNF 之前，通过木糖辅助球磨成功制备了亲水改性的 BNNS。与 CNF 薄膜（1.34 W/（m·K））相比，负载 30% BNNS 的 CNF/BNNS 复合材料的面内热导率（12.68 W/（m·K））显著提高了 846%。之后，通过 12.5%NaOH 溶液的丝光化，进一步显著提高了 CNF/BNNS 复合材料的韧性（8.0 MJ·m，提高了约 250%）和 TC（14.7 W/（m·K），提高了约 16%）。在相关研究中，韧性和 TC 的同时提高是前所未有的，这有助于有效制备热管理材料。
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