Soong Yu-Chian, Chiu Chih-Wei
Department of Materials Science and Engineering, National Taiwan University of Science and Technology, Taipei 10607, Taiwan.
Department of Materials Science and Engineering, National Taiwan University of Science and Technology, Taipei 10607, Taiwan.
J Colloid Interface Sci. 2021 Oct;599:611-619. doi: 10.1016/j.jcis.2021.04.123. Epub 2021 Apr 28.
Polymers having high filler loading levels are not able to meet the increasing requirements of thermal interface materials by themselves; therefore, fillers and structures with unique advantages have been developed. In this study, mechanical mixing was used to disperse graphene nanoplatelets (GNPs) and boron nitride (BN) fillers inside thermoplastic polyurethane (TPU)-based films, which were then compounded into a multilayered structure. The multilayered BN-GNP/TPU composite film created during this study exhibited a high thermal conductivity of 6.86 W m K at a low filler loading of 20 wt% BN with 20 wt% GNP, which was significantly higher (2844%) than that of the neat TPU film. The composite film also had good durability to flexural fatigue and laundering. This was exhibited by maintaining thermal conductivity values of 6.25 W m K after 5000 cycles of the flexural fatigue test, and 6.85 W m K after 10 cycles of laundering, respectively. Furthermore, enhanced thermal stability, cooling, and hydrophobic properties of the multilayered BN-GNP/TPU composite films were also observed with the resulting composite film. Overall, such a system provides a facile approach that is applicable for the fabrication of multifunctional materials as thermal interface materials within smart cooling garments.
具有高填充量的聚合物自身无法满足热界面材料日益增长的需求；因此，已开发出具有独特优势的填料和结构。在本研究中，采用机械混合的方法将石墨烯纳米片（GNPs）和氮化硼（BN）填料分散在热塑性聚氨酯（TPU）基薄膜内部，然后将其复合成多层结构。在本研究中制备的多层BN-GNP/TPU复合薄膜在20 wt% BN和20 wt% GNP的低填料负载量下表现出6.86 W m K的高导热率，这比纯TPU薄膜的导热率显著更高（高出2844%）。该复合薄膜还具有良好的抗弯曲疲劳和耐洗涤耐久性。这分别通过在5000次弯曲疲劳试验后保持6.25 W m K的导热率值，以及在10次洗涤后保持6.85 W m K的导热率值得以体现。此外，所得复合薄膜还展现出多层BN-GNP/TPU复合薄膜增强的热稳定性、散热性和疏水性。总体而言，这样的体系提供了一种简便的方法，适用于在智能冷却服装中制造作为热界面材料的多功能材料。
