石墨烯微片/聚丙烯导热复合材料的制备与性能

Preparation and properties of graphene nanoplatelets/PP thermal conductive composites

通过熔融共混法制备了两种不同型号石墨烯微片(GNPs)填加的GNPs/聚丙烯(PP)导热复合材料,研究了GNPs型号(KNG180,KNG150)和含量对其导热性能、密度、结晶性能和热稳定性能的影响。结果表明,KNG180GNPs/PP复合材料密度高于KNG150GNPs/PP,同时KNG180对提高聚丙烯结晶度的效果优于KNG150。随着石墨烯微片含量的增加,两种复合材料导热系数均明显增大,而且KNG180填充的复合材料导热性能明显优于KNG150;当KNG180的添加量为60%(质量分数)时,GNPs/PP复合材料的导热系数从纯聚丙烯的0.087W/(m·K)提高到1.32W/(m·K),提高了14倍多。石墨烯微片的加入显著提高了聚丙烯的热稳定性,当KNG180或KNG150的质量分数为10%时,聚丙烯达到最大热失重速率时的温度从345.1℃分别提高到374.6℃和397.9℃,但是当石墨烯微片超过一定含量时,热稳定性会下降。

Two kinds of GNPs/PP thermally conductive composites were prepared with KNG180 GNPs or KNG150 GNPs via melt blending, and their thermal conductivity, density, crystallization behavior and thermal stability were investigated. The results show that the density of KNG180 GNPs/PP composite is higher than that of KNG150 GNPs/PP, and the crystallization degree improvement of PP is higher when filled with KNG180 than KNG150. The thermal conductivity of composites was dramatically improved along with the increase of GNPs content, and the improvement of KNG180 GNPs/PP is much higher than KNG150 GPNs/PP. The composites contained 60% mass fraction of KNG180 has a thermal conductivity of 1.32 W/（m·K） which was more than 14 times as that of the pure PP（0.087 W/（m·K））. As the GNPs incorporated, thermal stability of the GNPs/PP composites is enhanced. When the mass fraction of KNG180 and KNG150 was 10%, the maximum mass loss rate temperature is increased from 345.1 ℃ to 374.6 ℃ and 397.9 ℃, respectively. But when the contents of KNG180 or KNG150 reach to a certain content, the thermal stability begins to decrease.