This paper investigates the high thermal conductive properties of modified hexagonal boron nitride (h‐BN)/epoxy (EP) composites. Octadecyl trimethyl ammonium bromide as a cationic surfactant modified h‐BN and sodium carboxymethylcellulose to build 3D heat transfer framework by the ice template method and preparation of epoxy composites. The h‐BN was modified by inter‐ionic charge electrostatic attraction to improve the h‐BN dispersibility; characterization by scanning electron microscope, transmission electron microscope, zeta potential, x‐ray diffraction and Fourier transform infrared spectroscopy proved the success of h‐BN surficial modifyment. 3 wt% sodium carboxymethylcellulose was used to construct the optimal 3D modified h‐BN network, and the w‐BN/EP composites had a very high heat conduction; when the composite material acquired by the ice template method have high heat transfer coefficient, 1.57 W/(m K) for 25 wt% 3D modified h‐BN/EP heat transfer coefficient and 0.76 W/(m K) for modified h‐BN/EP at the same ratio, which is a 107% enhancement in heat transfer efficiency, and 0.12 W/(m K) for EP, which is a 1208% enhancement in thermal conductivity. The results of thermogravimetric analysis (thermogravimetric analysis and differential thermogravimetric analysis), differential scanning calorimetry, and infrared thermography indicate that the thermostability and rejection of heat of composite material was significantly improved. The variation of dielectric constant was stabilized to ensure lower dielectric loss. Overall, this study can better adapt to high‐frequency signal transmission.Highlights Use octadecyl trimethyl ammonium bromide to modify the interface of hexagonal boron nitride (h‐BN) enhances the dispersibility and reduces the inter‐facial heat resistance with epoxy resin through inter‐ionic electrostatic attraction. The optimal content of sodium carboxymethyl cellulose was selected to construct a 3D mesh framework with the modified h‐BN to ensure the formation of a continuous and homogeneous network at the maximum porosity. The 3D modified h‐BN network was prepared by the ice template method to reinforce the heat conductivity of the composite materials.

中文翻译：

---

冰模板法3D改性六方氮化硼导热网络构建及环氧树脂基复合材料高导热系数研究


本文研究了改性六方氮化硼（h-BN）/环氧树脂（EP）复合材料的高导热性能。十八烷基三甲基溴化铵作为阳离子表面活性剂修饰h-BN和羧甲基纤维素钠，通过冰模板法构建三维传热框架并制备环氧复合材料。通过离子间电荷静电引力对h-BN进行改性，提高h-BN的分散性；通过扫描电子显微镜、透射电子显微镜、Zeta电位、X射线衍射和傅里叶变换红外光谱的表征证明了h-BN表面改性的成功。使用3 wt%羧甲基纤维素钠构建了最佳的3D改性h-BN网络，并且w-BN/EP复合材料具有非常高的导热性；当冰模板法获得的复合材料具有高传热系数时，25 wt% 3D 改性 h-BN/EP 传热系数为 1.57 W/(m·K)，改性 h-BN 传热系数为 0.76 W/(m·K) /EP 在相同比例下，传热效率提高了 107%，EP 为 0.12 W/(m·K)，导热系数提高了 1208%。热重分析（热重分析和差热重分析）、差示扫描量热法和红外热成像结果表明，复合材料的热稳定性和散热性能显着提高。介电常数的变化稳定，以确保较低的介电损耗。总体而言，本研究能够更好地适应高频信号传输。产品亮点 采用十八烷基三甲基溴化铵对六方氮化硼（h-BN）进行界面改性，通过离子间静电引力增强分散性并降低与环氧树脂的界面耐热性。选择最佳的羧甲基纤维素钠含量，用改性h-BN构建3D网格框架，以确保在最大孔隙率下形成连续且均匀的网络。采用冰模板法制备3D改性h-BN网络以增强复合材料的导热性。