Cho Jung Keun, Sun Hanna, Seo Hee Won, Chung June-Young, Seol Mina, Kim Sung-Hoon, Kim Ra-Seong, Park In-Kyung, Suhr Jonghwan, Park Joon Chul, Jung Heon Seob, Park Hyun Ho, Choi Hyouk Ryeol, Nam Jae-Do
School of Chemical Engineering, Department of Polymer Science and Engineering, Sungkyunkwan University, Suwon 16419, Republic of Korea.
Soft Matter. 2020 Aug 7;16(29):6812-6818. doi: 10.1039/c9sm02123j. Epub 2020 Jul 7.
As highly integrated electronic devices and automotive parts are becoming used in high-power and load-bearing systems, thermal conductivity and mechanical damping properties have become critical factors. In this study, we applied two different fillers of aluminium nitride (AlN) and boron nitride (BN), having polygonal and platelet shapes, respectively, into ethylene-propylene-diene monomer (EPDM) rubber to ensure improved thermo-mechanical properties of EPDM composites. These two different shapes are considered advantageous in providing effective pathways of phonon transfer as well as facilitating sliding movement of packed particles. When the volume ratio of AlN : BN was 1 : 1, the thermal conductivity of the hybrid-filler system (EPDM/AlN/BN) increased in comparison to that of the single-filler system (EPDM/AlN) of 3.03 to 4.76 W m K. The coefficient of thermal expansion (CTE) and thermal distortion parameter (TDP) substantially decreased from 59.3 ppm °C and 17.5 m K of EPDM/AlN, to 39.7 ppm °C and 8.4 m K of EPDM/AlN/BN, representing reductions of 33 and 52%, respectively. Moreover, the damping coefficient of EPDM/AlN/BN was greatly increased to 0.5 of at 50 °C, compared to 0.03 of neat EPDM. These excellent performances likely stem from the effective packing of AlN/BN hybrid fillers, which could induce facile energy transfer and effective energy dissipation by the sliding movement of the adjacent hybrid fillers in the EPDM matrix.
随着高度集成的电子设备和汽车零部件越来越多地应用于高功率和承重系统中，热导率和机械阻尼性能已成为关键因素。在本研究中，我们将分别具有多边形和片状形状的两种不同填料氮化铝（AlN）和氮化硼（BN）应用于三元乙丙橡胶（EPDM）中，以确保改善EPDM复合材料的热机械性能。这两种不同形状被认为有利于提供有效的声子传递途径，并促进填充颗粒的滑动。当AlN与BN的体积比为1:1时，混合填料体系（EPDM/AlN/BN）的热导率相较于单填料体系（EPDM/AlN）从3.03 W m⁻¹ K⁻¹增加到4.76 W m⁻¹ K⁻¹。热膨胀系数（CTE）和热变形参数（TDP）从EPDM/AlN的59.3 ppm °C和17.5 m K大幅降至EPDM/AlN/BN的39.7 ppm °C和8.4 m K，分别降低了33%和52%。此外，EPDM/AlN/BN的阻尼系数在50 °C时大幅增加至0.5，而纯EPDM的阻尼系数为0.03。这些优异的性能可能源于AlN/BN混合填料的有效填充，这可以通过EPDM基体中相邻混合填料的滑动诱导轻松的能量转移和有效的能量耗散。
