摘要
选用六方氮化硼(h-BN)和α球形 Al2O3为导热填料,分别以单一填料和复配填料制备填充共聚甲醛(Co-POM)导热材料,研究了填料含量、复配比例等因素对 Co-POM 材料的导热系数、拉伸性能和微观形态的影响。结果表明:两种填料都能提高 Co-POM材料的导热系数,填充量越大,导热系数越高,但 h-BN 比 Al2O3 导热改性效果更好。当 h-BN 和 Al2O3 复配填充质量比为 1∶1(填充总量的质量分数为 20%)时,Co-POM 导热系数超过 Al2O3 质量分数为30%的单一填料的导热系数,并接近 h-BN 质量分数为 20%的单一填料的导热系数,而复配填充 Co-POM 的力学性能变化不大。因此,复配填料能达到降低填充量以及降低填料成本的目的。
Copolyoxymethylene(Co-POM) material has ordered molecular structure without side-chain, and is called metallic plastic because of its good dimensional stability, mechanical properties, processability and insulation. Co-POM material is widely applied in many fields, such as electronics and electrical appliances, plumbing and irrigation equipments, automobiles. However, the application of Co-POM is limited in the fields of microelectronics and LED lighting due to its low thermal conductivity. Therefore, it is crucial to prepare the Co-POM material with high thermal conductivity and excellent mechanical properties. To this regard, we blend some thermally conductive fillers with Co-POM resin in order to improve its thermal conductivity. Hexagonal boron nitride (h-BN) and α spherical alumina (Al2O3) can be as thermally conductive filler, due to their higher thermal conductivity than Co-POM. Co-POM thermally conductive materials were prepared with single or composite fillers. The effects of filler content and composition ratio on the thermal conductivity, tensile property and micro-morphology of thermally conductive Co- POM materials were investigated in this work. The results showed that the thermal conductivity Co-POM materials could be improved by filling with h-BN or Al2O3, the more the content of filler was used, the higher thermal conductivity of filled materials was obtained. Notably, the thermally modified effect of h-BN was better than Al2O3. Furthermore, in case the mass ratio of h-BN and Al2O3 was at 1:1, the resulting thermally conductivity of Co-POM material (the mass fraction of filler was 20%, the same below) was higher than the Co-POM material prepared with 30%(mass fraction) Al2O3, and approaching to the thermal conductivity of Co-POM prepared with 20%(mass fraction) h-BN. Additionally, the tensile strength of Co-POM material filled with composite showed slight changes. Therefore, the use of composite fillers can reduce the added content of filler, and thereby decrease the cost of materials preparatio
作者
吴唯
刘建华
刘江
邹志强
张雪薇
WU Wei;LIU Jianhua;LIU Jiang;ZOU Zhiqiang;ZHANG Xuewei(Sino-German Joint Research Center of Advanced Materials,School of Materials Science and Engineering,East China University of Science and Technology,Shanghai 200237,China)
出处
《华东理工大学学报（自然科学版）》
CAS
CSCD
北大核心
2019年第3期419-423,共5页
Journal of East China University of Science and Technology
