酒石酸改性BT增强PP复合材料导热与介电性能

以酒石酸为改性剂,对钛酸钡(BT)颗粒进行表面改性,制备了聚丙烯(PP)/纳米氧化铝(Al2O3)/改性BT系列3相复合材料.通过傅里叶红外光谱、扫描电子显微镜、介电频谱仪、导热分析仪对复合材料的红外光谱、微观形貌、介电性能、导热性能等进行分析表征.结果表明,酒石酸对BT颗粒的表面改性能有效改善BT、Al2O3等无机填...

Tartaric Acid Modified BT to Enhance the Thermal Conductivity and Dielectric Properties of PP Composites

The three-phase composite materials based on polypropylene(PP),nano-alumina(Al₂O₃)and the bernary barium titanate(BT)modified with tartaric acid were prepared and their structure and performance were characterized by Fourier transform infrared spectrometer,scanning electron microscope,dielectric spectrometer and thermal conductivity analyzer.The results indicated that the surface modification for BT particles effectively improved the compatibility of PP with BT,Al₂O₃and other inorganic fillers,promoting the uniformity of BT,Al₂O₃and other particles dispersed in the PP matrix.As a result,the thermal conductivity and dielectric properties of the composites was improved simultaneously.The three-phase composites presented an increase in thermal conductivity from 0.90 to 1.24 at a PPBTAl₂O₃volume ratio of 541.Their relative dielectric constant at 100 Hz also increased from 18 to 21.2,but their dielectric loss decreased from 0.055 to 0.035.The dielectric properties of composites exhibited a good temperature stability with a dielectric constant-temperature coefficient of-124×10^-6℃^-1in the temperature range of 25~130℃,and their dielectric constant-temperature coefficient decreased by 62.8%in comparison with the unmodified composites.