State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute of Sichuan University, Chengdu, Sichuan 610065, China.
State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute of Sichuan University, Chengdu, Sichuan 610065, China.
Carbohydr Polym. 2021 Aug 15;266:118127. doi: 10.1016/j.carbpol.2021.118127. Epub 2021 Apr 28.
More than 110,000,000 tons of mismanaged plastics were to be produced in 2020. Polymers are favored in the preparation of thermally conductive materials due to their excellent comprehensive properties. However, most polymers fabricated for thermally conductive materials are difficult to degrade in the natural environment. To alleviate the increasingly severe environmental problems, we reported a novel eco-friendly material with high thermal conductivity, which was composited of chitosan microspheres (CSM) and hydroxyl-functionalized hexagonal boron nitride (OH-h-BN) nanoplatelets. Utilizing their significant difference in scales, the OH-h-BN nanoplatelets were arranged between each CSM. Their overall structure was similar to the honeycomb: CSM were honeycomb cores, and OH-h-BN nanoplatelets were honeycomb network. The routine-structure OH-h-BN/CS nanocomposites were only 0.94 ± 0.02 W·m·K at 50 wt% in thermal conductivity. However, the OH-h-BN/CSM nanocomposites with honeycomb structure can reach 5.66 ± 0.32 W·m·K in the same loading, for enhancement of 502% and 1914% than OH-h-BN/CS nanocomposites and pure CS, respectively.
2020 年，预计将产生超过 1.1 亿吨管理不善的塑料。由于其优异的综合性能，聚合物在制备导热材料中受到青睐。然而，大多数用于导热材料的聚合物在自然环境中难以降解。为了缓解日益严重的环境问题，我们报道了一种新型的环保材料，具有高热导率，它由壳聚糖微球（CSM）和羟基功能化六方氮化硼（OH-h-BN）纳米片组成。利用它们在尺度上的显著差异，OH-h-BN 纳米片排列在每个 CSM 之间。它们的整体结构类似于蜂窝：CSM 是蜂窝的核心，OH-h-BN 纳米片是蜂窝网络。在 50wt%的热导率下，常规结构的 OH-h-BN/CS 纳米复合材料仅为 0.94±0.02W·m·K。然而，具有蜂窝结构的 OH-h-BN/CSM 纳米复合材料在相同的负载下可以达到 5.66±0.32W·m·K，分别比 OH-h-BN/CS 纳米复合材料和纯 CS 增强了 502%和 1914%。
