热界面材料是解决现代高功率和高集成化电子器件热量聚集和耗散的有效手段.基于三维网络结构调控导热性能的策略,以三聚氰胺泡沫(MF)为骨架,采用化学表面改性制备碳纳米管三维网络结构(CNT),并采用真空浸润法制备碳纳米管/天然橡胶热界面复合材料(CNT/NR),研究CNT含量对材料微观结构、导热性能和热管理性能的影响.结果表明,当CNT的含量为2.2％(质量分数)时,CNT可附着于MF骨架并呈现完整连续的三维网络结构,其热界面复合材料垂直面外的导热率为1.58 W m-1 K-1,拉伸强度为12.9 MPa,断裂伸长率为489％,并具有显著的热管理性能,这表明CNT/NR热界面复合材料有望成为一种机具应用价值的热管理材料.
Preparation of carbon nanotube/natural rubber thermal interface materials and study of the thermal management performance
Thermal interface materials offer an effective means to address the thermal accumulation and dissipa-tion challenges in modern high-power and highly integrated electronic devices.Employing a strategy based on the regulation of thermal conductivity through a three-dimensional network structure,we used melamine foam(MF)as the framework.We prepared a three-dimensional network structure of carbon nanotubes(CNT)by employing chemical surface modification and high-temperature carbonization.Subsequently,we created a ther-mal interface composite material of carbon nanotubes/natural rubber(CNT/NR)using a vacuum infiltration method,and investigated the influence of CNT content on the material's microstructure,thermal conductivity,and thermal management performance.The results indicate that when the CNT content is 2 wt％,CNT can ad-here to the MF framework,forming a complete and continuous three-dimensional network structure.This CNT/NR thermal interface composite material exhibits a thermal conductivity of 1.68 W/(m·K),a tensile strength of 12.9 MPa,and a elongation at break of 489％in the vertical direction and demonstrates significant thermal management capabilities,showing significant thermal management performance.These findings sug-gest that CNT/NR thermal interface composite materials have the potential to become valuable thermal man-agement materials suitable for applications.
万方数据
维普
