摘要
以聚氨酯(TPU)为基体,制备碳纳米管(CNT)含量为0.9%的TPU/CNT复合材料,研究工艺条件对制品的介电性能的影响。分别研究了密炼过程中密炼转速和密炼温度对复合材料介电性能的影响。当密炼温度一定时,随密炼转速增大,密炼时的转矩逐渐增大,从而使基体对填料的剪切应力增大,体系混合得更加均匀,界面增多,界面极化增强,表现为材料的介电常数增大,但是介电损耗及电导率同时增大;当密炼转速一定时,随密炼温度升高,熔体黏度下降,转矩减小,剪切应力减小,CNT在TPU中的混合均匀性降低,界面及界面极化减少,介电常数下降,同时介电损耗及电导率减小。与密炼温度相比,密炼转速对复合材料介电性能的影响更显著,其中,介电常数最敏感,在10^(3) Hz频率下,当密炼转速为90、110、140 r/min时,对应的介电常数分别是8.54、12.62、15.56。
The TPU/CNT composite was prepared using polyurethane(TPU)as matrix with carbon nanotube(CNT)content of 0.9%.The effects of process conditions on the dielectric properties of the composite was investigated.In this paper,the effects of the rotational speed and the rotational temperature on the dielectric properties of the composite were studied.When the rotational temperature was constant,the increase of the speed will increase the torque,the shear force of the matrix on the packing,the mixing of the system was more uniform,the interface was increased,the interface polarization was enhanced,which showed that the permittivity of the material was increased,but the dielectric loss and conductivity were also increased;When the rotational speed was constant,the melt viscosity,torque and shear force decrease when the rotational temperature increases,the mixing uniformity of CNT in TPU decreases,the interface becomes less,the interface polarization decreases,the permittivity decreases,and the dielectric loss and conductivity decrease at the same time.The influence of rotational speed on the dielectric properties of composite was greater than that of rotational temperature,especially the performance of the permittivity was more sensitive.At the frequency of 10^(3) Hz,the permittivities corresponding to the rotational speed of 90,110 and 140 r/min were 8.54,12.62 and 15.56 respectively.
作者
余文文
刘颖
吴大鸣
张苗苗
闫可心
朱嘉澍
郭梦丽
盖子鹏
YU Wenwen;LIU Ying;WU Daming;ZHANG Miaomiao;YAN Kexin;ZHU Jiashu;GUO Mengli;GAI Zipeng(Institute of Plastic Machinery and Plastic Engineering(IPME),Beijing University of Chemical Technology,Beijing 100029,China;Engineering Research Center for Polymer Processing Equipment,Ministry of Education,Beijing 100029,China)
出处
《塑料》
CAS
CSCD
北大核心
2022年第1期140-144,共5页
Plastics
关键词
复合材料
密炼转速
密炼温度
介电常数
介电损耗
电导率
composite material
rotational speed
rotational temperature
permittivity
dielectric loss
conductivity
