Title :
Analysis of the depolarized current in polyvinylidene flouride
Author :
Jiazhen, Wu ; Yuhua, Wu
Author_Institution :
Dept. of Chem. Eng., Tsinghua Univ., Beijing, China
Abstract :
There is a significant difference between the depolarized current spectrum of the α-form of polyvinylidene fluoride (PVDF) from room temperature to 160°C and that of the γ-form. For the former, a depolarized current peak (called peak P3) appears around 50°C. but it is not so distinct for the latter. Peak P 3 around 50°C is related to the dipolar depolarized current of α-form PVDF at various polarizing field, temperature, and time shows that peak P3 behaves like a space charge peak. Hence, it is concluded that peak P3 is actually the superposition of two peaks: one is a dipole peak at 45°C and is attributed to molecular motion in crystalline regions, the other is a space charge peak at 60°C and is attributed to the interface depolarization between crystalline and amorphous regions
Keywords :
dielectric depolarisation; dielectric thin films; organic insulating materials; polymer films; α-form; γ-form; 20 to 160 C; PVDF; depolarized current peak; depolarized current spectrum; dipolar depolarized current; dipole peak; interface depolarization; molecular motion in crystalline regions; peak P3; polarizing field; polyvinylidene flouride; room temperature; space charge peak; superposition of two peaks; temperature; time; Amorphous materials; Casting; Chemical engineering; Crystallization; Density measurement; Piezoelectric polarization; Piezoelectricity; Polymers; Space charge; Temperature distribution;
Conference_Titel :
Properties and Applications of Dielectric Materials, 1988. Proceedings., Second International Conference on Properties and Applications of
Conference_Location :
Beijing
DOI :
10.1109/ICPADM.1988.38422
