TY - GEN
T1 - Dielectric properties of sandwich-structured CNF/PVDF composites
AU - Sun, Li Li
AU - Zhong, Wei Hong
AU - Zhao, Yan
PY - 2010
Y1 - 2010
N2 - To keep low dielectric loss when a dielectric constant is increased is challenging when nanofillers are added into polymer matrices. Poly (vinylidene fluoride) (PVDF) is an important ferroelectric polymer and has garnered much attention owing to its unique properties, such as high dielectric and extraordinary pyro- and piezoelectric properties. In this paper, sandwich-structured/multi-layered carbon nanofiber (CNF)/PVDF composites with heterogeneous distribution of CNFs were prepared via solution casting and compression molding methods in order to obtain improved dielectric constant while keeping dielectric loss as low as that of pure PVDF level. The CNF concentrations were 1 wt%, 3 wt% and 5 wt%. The effects of the designed structures and concentrations of CNFs on the dielectric properties of the resulting sandwich structures within the frequency range of 10-2 Hz to 106 Hz were analyzed. The results revealed that the enhanced dielectric constant and the low dielectric loss with that of pure PVDF level were achieved simultaneously from the sandwich structures. The dielectric loss of the sandwich structure with 5 wt% CNF/PVDF layers was even lower than that of pure PVDF in the frequency range below 104 Hz. On the other hand, the introduction of CNFs had dramatic influence on the dielectric properties of the multi-layered structures, especially in the low frequency range. However, the dielectric constant did not consistently increase with increasing CNF loadings. The highest dielectric constant was obtained in the sandwich structure with 3 wt% CNF/PVDF composite layers, which was increased by 460% at 1 kHz and by 790% at 10-2 Hz.
AB - To keep low dielectric loss when a dielectric constant is increased is challenging when nanofillers are added into polymer matrices. Poly (vinylidene fluoride) (PVDF) is an important ferroelectric polymer and has garnered much attention owing to its unique properties, such as high dielectric and extraordinary pyro- and piezoelectric properties. In this paper, sandwich-structured/multi-layered carbon nanofiber (CNF)/PVDF composites with heterogeneous distribution of CNFs were prepared via solution casting and compression molding methods in order to obtain improved dielectric constant while keeping dielectric loss as low as that of pure PVDF level. The CNF concentrations were 1 wt%, 3 wt% and 5 wt%. The effects of the designed structures and concentrations of CNFs on the dielectric properties of the resulting sandwich structures within the frequency range of 10-2 Hz to 106 Hz were analyzed. The results revealed that the enhanced dielectric constant and the low dielectric loss with that of pure PVDF level were achieved simultaneously from the sandwich structures. The dielectric loss of the sandwich structure with 5 wt% CNF/PVDF layers was even lower than that of pure PVDF in the frequency range below 104 Hz. On the other hand, the introduction of CNFs had dramatic influence on the dielectric properties of the multi-layered structures, especially in the low frequency range. However, the dielectric constant did not consistently increase with increasing CNF loadings. The highest dielectric constant was obtained in the sandwich structure with 3 wt% CNF/PVDF composite layers, which was increased by 460% at 1 kHz and by 790% at 10-2 Hz.
UR - https://www.scopus.com/pages/publications/78649461642
M3 - 会议稿件
AN - SCOPUS:78649461642
SN - 9781934551073
T3 - International SAMPE Symposium and Exhibition (Proceedings)
BT - SAMPE 2010 Conference and Exhibition "New Materials and Processes for a New Economy"
T2 - SAMPE 2010 Conference and Exhibition "New Materials and Processes for a New Economy"
Y2 - 17 May 2010 through 20 May 2010
ER -