Heat dissipative mechanical damping properties of EPDM rubber composites including hybrid fillers of aluminium nitride and boron nitride.,Soft Matter

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Heat dissipative mechanical damping properties of EPDM rubber composites including hybrid fillers of aluminium nitride and boron nitride.
Soft Matter ( IF 2.9 ) Pub Date : 2020-07-07 , DOI: 10.1039/c9sm02123j
Jung Keun Cho ₁ , Hanna Sun , Hee Won Seo , June-Young Chung , Mina Seol , Sung-Hoon Kim , Ra-Seong Kim , In-Kyung Park , Jonghwan Suhr , Joon Chul Park , Heon Seob Jung , Hyun Ho Park , Hyouk Ryeol Choi , Jae-Do Nam

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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⁻¹ K⁻¹. The coefficient of thermal expansion (CTE) and thermal distortion parameter (TDP) substantially decreased from 59.3 ppm °C⁻¹ and 17.5 m K⁻¹ of EPDM/AlN, to 39.7 ppm °C⁻¹ and 8.4 m K⁻¹ 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.

中文翻译：

EPDM橡胶复合材料的散热机械阻尼性能，包括氮化铝和氮化硼的混合填料。

随着高度集成的电子设备和汽车零件越来越多地用于大功率和承重系统中，导热系数和机械阻尼特性已成为关键因素。在这项研究中，我们将两种分别具有多边形和片状形状的氮化铝（AlN）和氮化硼（BN）填充剂用于乙烯-丙烯-二烯单体（EPDM）橡胶中，以确保改善EPDM的热机械性能复合材料。这两种不同的形状被认为有利于提供声子传递的有效途径以及促进堆积颗粒的滑动运动。当AlN：BN的体积比为1：1时，混合填充系统（EPDM / AlN / BN）的导热系数与单填充系统（EPDM / AlN）的3.03至4.76 W相比有所增加米^-1 K^-1。热膨胀系数（CTE）和热变形参数（TDP）的系数基本上从59.3 ppm的℃降至^-1和17.5米ķ^-1 EPDM / AlN的，至39.7 ppm的℃，^-1和8.4米ķ^-1 EPDM的/ AlN / BN，分别减少了33％和52％。而且，与纯EPDM的0.03相比，EPDM / AlN / BN的阻尼系数在50°C时大大提高到0.5。这些出色的性能可能源于AlN / BN杂化填料的有效填充，可通过相邻杂化填料在EPDM基质中的滑动运动来诱导便捷的能量转移和有效的能量消散。

更新日期：2020-07-29

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