<br>静电纺丝制备具有优异隔热性能的中空二氧化硅/PTFE 纤维膜,Applied Thermal Engineering

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静电纺丝制备具有优异隔热性能的中空二氧化硅/PTFE 纤维膜
Applied Thermal Engineering ( IF 6.1 ) Pub Date : 2024-07-19 , DOI: 10.1016/j.applthermaleng.2024.123959
Guotao Wang , Lin Wang , Jian You , Yuchen Yang , Yuanze Wang , Wei Wang , Longmin Liu , Jianying Huang , Yongzhao Li , Weihe Yu , Huaiyin Chen , Yuekun Lai , Weilong Cai

柔性保温膜在人体户外穿着和电子产品的热管理中起着关键作用。本研究采用静电纺丝制备了隔热中空二氧化硅/聚四氟乙烯（HSi/PTFE）纤维膜。以正硅酸四乙酯为硅源，以热液碳球为模板制备 HSi。含有 HSi 的 PTFE 纺丝溶液用于制备纤维膜。通过将 HSi 嵌入 PTFE 纤维中，提高了纤维的传热阻力，从而提高了纤维膜的隔热能力。研究了 HSi 含量对 PTFE 纤维膜保温性能的影响。当 HSi 含量为 5 % 时，纤维膜表现出最低的导热系数（0.0197 W/（m·K）），不仅低于大多数纤维保温材料，而且具有优异的拉伸性能（拉伸变形能力为 168 %），便于实际应用。此外，这种纤维膜还具有很高的疏水性（水接触角为 147°），有效降低了水分对保温性能的影响。这项工作为保温材料的未来发展提出了创新前景。

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Preparation of hollow silica/PTFE fiber membrane with excellent thermal insulation performance by electrospinning

Flexible thermal insulation membrane plays a key role in outdoor wear of human body and thermal management of electronic products. This study used electrospinning to prepare thermal insulation hollow silica/polytetrafluoroethylene (HSi/PTFE) fiber membranes. HSi were prepared using tetraethylorthosilicate as the silicon source and hydrothermal carbon spheres as templates. A spinning solution of PTFE containing the HSi was used to prepare fiber membranes. The heat transfer resistance of the fiber is improved by embedding HSi into the PTFE fiber, resulting to improved heat insulation capability of the fiber membrane. The influence of HSi content on the thermal insulation performance of PTFE fiber membrane was studied. When the HSi content was 5 %, the fiber membrane showed the lowest thermal conductivity (0.0197 W/(m·K)), which was not only lower than most fiber thermal insulation materials, but also had excellent tensile properties (tensile deformation capacity of 168 %), which was convenient for practical application. In addition, this kind of fiber membrane also has high hydrophobicity (water contact angle of 147°), effectively reducing the influence of moisture on thermal insulation performance. This work presents innovative prospects for the future advancement of thermal insulation materials.

更新日期：2024-07-19

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