writer：Yu, Ruobing; Huang, Ren; Shi, Qingfeng; Chen, Kaimin; Xu, Shiai
keywords：无
source：会议
specific source：2007 INTERNATIONAL CONFERENCE ON ADVANCED FIBERS AND POLYMER MATERIALS 2007 Shanghai, China
Issue time：2007年
In CB/HDPE composite, there exist two transitions with the increase of CB; concentration. One is insulator-semiconductor transition; the other is semiconductor-conductor transition. Semiconductor-conductor transition is characterized by dynamic rheological measurements, which appears a plateau at low frequency. And insulator-semiconductor transition can be detected by dielectric analysis characterized by variation of AC conductivity with frequency due to different conductive mechanisms. At the same time, we attempted to study the relaxation processes in CB/HDPE composite by relaxation spectrum, calculated by the nonlinear Tikhonov regularization method from dynamic modulus. Due to the constrict of CB, the characteristic relaxation time of HDPE in HDPE/CB composite is longer than pure HDPE, whose characteristic relaxation time is about 0.8s. When the content of CB is above 12wt%, the characteristic relaxation time of HDPE doesn''t appear within 100s.