Pornea Arni Gesselle M, Choi Ki-In, Jung Jung-Hwan, Hanif Zahid, Kwak Cheolwoo, Kim Jaewoo
R&D Center, Naieel Technology, 6-2 Yuseongdaero 1205, 2nd FL, Daejeon 34104, Republic of Korea.
CMT Co., Ltd., 322 Teheran-ro, Hanshin Intervalley 24 East Bldg., Gangnam-gu, Seoul 06211, Republic of Korea.
ACS Omega. 2023 Jun 29;8(27):24454-24466. doi: 10.1021/acsomega.3c02246. eCollection 2023 Jul 11.
In this research article, a poly(dimethylsiloxane) (PDMS)-based composite was postulated adapting an interactive ternary filler system consisting of AlO, hexagonal boron nitride (h-BN), and boron nitride nanotubes (BNNT) to construct a continuous three-dimensional (3D) structure for thermal attenuation. AlO was imposed as a main filler, while h-BN and BNNT were assimilated to form interconnected heat conduction pathways for effective thermal dissipation. The structured framework articulates a profound improvement in isotropic thermal conductivity considering both axial and radial heat dissipation. The presence of h-BN entails uniform heat distribution in a planar mode, eliminating the occurrence of hotspots, while BNNT constructed a connecting phonon pathway in various directions, which insinuates effective overall thermal transport. The generated ternary filler composites attained an isotropic ratio of 1.35 and a thermal conductivity of 7.50 W/mK, which is a 36-fold (∼3650%) increase compared to neat PDMS resin and almost 3-fold (∼297%) that of the AlO unary filler composite and ∼53% that of its binary counterpart, partaking interfacial thermal gaps of ∼36.15 and ∼62.24% on practical heating performance relative to its counterparts. Moreover, the incorporation of BNNT on a traditional spherical and planar filler offers an advantage not only in thermal conductivity but also in thermal and structural stability. Improvement in thermal stability is stipulated due to a melting point () shift of ∼11 °C upon the assimilation of BNNT. Mechanical permeance reinforcement was also observed with the presence of BNNT, showcasing a 31.5% increase in tensile strength and a 53% increase in Young's modulus relative to the singular filler composite. This exploration administers a new insight into heat dissipation phenomena in polymeric composites and proposes a simple approach to their design and assembly.
在这篇研究文章中，假定采用一种基于聚二甲基硅氧烷（PDMS）的复合材料，该复合材料采用由AlO、六方氮化硼（h-BN）和氮化硼纳米管（BNNT）组成的交互式三元填料体系，构建用于热衰减的连续三维（3D）结构。AlO作为主要填料，而h-BN和BNNT则被用于形成相互连接的热传导路径，以实现有效的热耗散。考虑到轴向和径向热耗散，该结构化框架在各向同性热导率方面有显著提高。h-BN的存在使热量在平面模式下均匀分布，消除了热点的出现，而BNNT则在各个方向构建了连接声子的路径，这意味着有效的整体热传输。生成的三元填料复合材料的各向同性比率为1.35，热导率为7.50 W/mK，与纯PDMS树脂相比提高了36倍（约3650%），几乎是AlO一元填料复合材料的3倍（约297%），是其二元对应物的约53%，在实际加热性能方面相对于其对应物的界面热隙约为36.15%和62.24%。此外，在传统的球形和平面填料中加入BNNT不仅在热导率方面有优势，而且在热稳定性和结构稳定性方面也有优势。由于加入BNNT后熔点（）偏移约11°C，热稳定性得到了提高。在BNNT存在的情况下还观察到机械渗透率增强，相对于单一填料复合材料，拉伸强度提高了31.5%，杨氏模量提高了53%。这一探索为聚合物复合材料中的热耗散现象提供了新的见解，并提出了一种简单的设计和组装方法。
