摘要
针对现有文献报道的石墨烯/PP复合材料导热系数测量结果差异较大,该文对相应测量方法、仪器、样品尺寸和测量结果等进行分析和评价。制备质量分数为5%至30%的石墨烯/PP复合材料块状和薄片状等样品,分别通过QTM500型、TC3000型和DRE-Ⅲ型3种瞬态导热系数测试仪对块状样品导热系数进行直接测量,并通过LFA467型激光闪光法导热仪、DSC3+型差示扫描量热仪和ZB603C型电子天平和密度组件分别对各质量分数石墨烯/PP复合材料样品的热扩散系数、比热容和密度进行测量后计算获得导热系数。结果表明:3种瞬态导热系数测试仪测量纯PP、5%和10%质量分数石墨烯/PP复合样块导热系数偏差在2.6%~8.7%范围内,大于各仪器声称测量偏差;直接测量法与间接测量法获得的导热系数偏差大于36%,且随石墨烯质量分数的增加而变大。因此,在测量复合材料导热系数时应选择适用尺寸和量程的直接测量法,导热系数等热物性参数的量值传递体系仍需进一步建立和完善来提高直接测量法的准确性和间接测量法的可靠性。
In view of the large differences in the measurement results of thermal conductivity of graphene/PP composites reported in the references,the methods,instruments,size of samples and measurement results are analyzed and evaluated in this paper.Bulk and flake samples of graphene/PP composites with mass fraction of 5%to 30%were prepared.The thermal conductivity of bulk samples was directly measured by three transient thermal conductivity testers:QTM500,TC3000 and DRE-Ⅲ.The thermal diffusivity,specific heat capacity and density of graphene/PP composites were measured by LFA467 laser flash thermal conductivity meter,DSC3+differential scanning calorimeter,ZB603C electronic balance and density module and the thermal conductivity was calculated.The results show that the thermal conductivity deviation of pure PP,5% and 10% graphene/PP composite samples measured by three kinds of transient thermal conductivity tester is in the range of 2.6%-8.7%,which is greater than the claimed measurement deviation of each instrument.The deviation of thermal conductivity obtained by direct measurement method and indirect measurement method is more than 36%,and increases with the increase of graphene mass fraction.Therefore,the appropriate direct measurement method with size of samples and range of instrument should be selected when measuring the thermal conductivity of composite materials.The value transfer system of thermal properties such as thermal conductivity still need to be further established and improved to increase the accuracy of direct measurement method and the reliability of indirect measurement method.
作者
周逸
刘薇
冯晓娟
邱萍
李会东
潘永杲
ZHOU Yi;LIU Wei;FENG Xiaojuan;QIU Ping;LI Huidong;PAN Yonggao(Changzhou Institute of Inspection Testing Standardization and Certification,Changzhou 213164,China;National Institute of Metrology,Beijing 100029,China;Shanghai Institute of Ceramics,Chinese Academy of Sciences,Shanghai 201899,China)
出处
《中国测试》
CAS
北大核心
2022年第2期66-74,共9页
China Measurement & Test
基金
国家重点研发计划项目资助(2016YFF0101707)。
关键词
石墨烯
聚丙烯
复合材料
导热系数
热扩散系数
比热容
graphene
polypropylene
composites
thermal conductivity
thermal diffusivity
specific heat capacity
