Chen Geyang, Yadav A A, Jung In-Woo, Lee Junho, Choi Kyungwho, Kang Seok-Won
Department of Mechanical Engineering, Yeungnam University, Gyeongsan, Gyeongbuk, 38541, Republic of Korea.
Department of Automotive Engineering, Yeungnam University, Gyeongsan, Gyeongbuk, 38541, Republic of Korea.
Sci Rep. 2022 Sep 26;12(1):16029. doi: 10.1038/s41598-022-19755-8.
Recently, polymer-based materials have been used in various filed of applications, but their low thermal conductivity restricts their uses due to the high interfacial thermal resistance. Therefore, in this study, one-dimensional thin-walled carbon nanotube (1D-TWCNT) and two-dimensional boron nitride nanosheet (2D-BNNS) fillers were used to enhance the thermal properties of polyvinyl alcohol (PVA). An important factor to be considered in enhancing the thermal properties of PVA is the interfacial configuration strategy, which provides sufficient pathways for phonon transport and the controlled loss of the intrinsic thermal properties of the filler nanomaterial. In this study, the effect of sodium tetraborate (borax) additive on the thermal properties of 1D-TWCNT/PVA and 2D-BNNS/PVA nanocomposites was explored. Borax is a well-known crosslinking additive that can be used with PVA. The crosslink density of the PVA-borax nanocomposite was controlled by changing its borate ion concentration. The addition of borax into nanocomposites improves the conductivity of 1D-TWCNT/PVA nanocomposites up to 14.5% (4 wt.% borax) and of 2D-BNNS/PVA nanocomposite up to 30.6% for BNNS (2 wt.% borax). Thus, when borax was added, the 2D-BNNS/PVA nanocomposite showed better results than the 1D-TWCNT/PVA nanocomposite.
近年来，聚合物基材料已被应用于各个领域，但由于其界面热阻较高，低导热率限制了它们的使用。因此，在本研究中，使用一维薄壁碳纳米管（1D-TWCNT）和二维氮化硼纳米片（2D-BNNS）填料来提高聚乙烯醇（PVA）的热性能。在提高PVA热性能时需要考虑的一个重要因素是界面构型策略，该策略为声子传输提供了足够的途径，并控制了填料纳米材料固有热性能的损失。在本研究中，探索了硼砂添加剂对1D-TWCNT/PVA和2D-BNNS/PVA纳米复合材料热性能的影响。硼砂是一种众所周知的可与PVA一起使用的交联添加剂。通过改变其硼酸根离子浓度来控制PVA-硼砂纳米复合材料的交联密度。向纳米复合材料中添加硼砂可使1D-TWCNT/PVA纳米复合材料的电导率提高14.5%（4 wt.%硼砂），使2D-BNNS/PVA纳米复合材料（2 wt.%硼砂）中BNNS的电导率提高30.6%。因此，添加硼砂时，2D-BNNS/PVA纳米复合材料的效果优于1D-TWCNT/PVA纳米复合材料。
