摘要
聚合物电介质材料在低温(接近或低于液氮沸点)下比室温下能俘获更多由电极注入的带电粒子并形成空间电菏,将影响聚合物电介质在低温下的介电性能.本文用电声脉冲法和热刺激电流法(TSC)测量了空间电荷的分布及陷阱能级,表明该现象与聚合物电介质中存在的浅能级局部态有关.本文的研究为选用低温电气绝缘聚合物材料提供了新的依椐.
More charged particals can be trapped in polymer dielectrics at cryogenic temperatures than at room temperatures and form space charges,which have influence on dielectric properties of polymers at cryogenic temperatures. The distribution of space charges and the energy level of traps are measu-red bp using the pulsed electro acoustic and TSC techniques.The result shows that the appearance of more space charges at cryogenic temperatures is conne-cted with the shallow energy level of localized states in the polymer.The view point mentioned above is helpful for the better application of dielectric polymers at cryogenic temperatures.
出处
《西安交通大学学报》
EI
CAS
CSCD
北大核心
1990年第4期11-16,24,共7页
Journal of Xi'an Jiaotong University
基金
国家自然科学基金
关键词
低温材料
空间电荷
高聚物
电性能
space charge
cryogenic materials
polymer electrical properties
surface states
