Title :
Preparation of BaTiO3-MWNT/polyvinylidene fluoride three-phase composites with novel dielectric behavior
Author :
Yao, Shenghong ; Yuan, Jinkai ; Zhimin Dang ; Bai, Jinbo
Author_Institution :
Key Lab. of Beijing City for Preparation & Possessing of Novel Polymer Mater., Beijing Univ. of Chem. Technol., Beijing, China
Abstract :
A three-phase composite with multiwall carbon nanotube (MWNT) and BaTiO3 particles embedded into polyvinylidene fluoride (PVDF) is prepared by using a flocculation and hot-molding technique, which is eco-friendly compared with solution method avoiding the pollution of solvent to the air. The uniform dispersion of fillers in matrix is realized and the dielectric constant is as high as 924 at 102 Hz when the volume concentrations of MWNT and BaTiO3 are 0.02 and 0.2, respectively, which is four times larger than that of MWNT/PVDF composite with 2 vol% MWNT prepared by solution method (epsiv=231). Meanwhile, the incorporation of the third phase decreases the dielectric loss abruptly (672rarr67 at 102 Hz). This phenomenon can be explained well by employing the interaction between two kinds of fillers and the evolutions of microcapacitance structure.
Keywords :
barium compounds; carbon nanotubes; composite materials; materials preparation; permittivity; titanium compounds; BaTiO3; dielectric behavior; dielectric constant; dielectric loss; flocculation technique; hot-molding technique; microcapacitance structure; multiwall carbon nanotube; polyvinylidene fluoride three-phase composites; Carbon nanotubes; Ceramics; Dielectric constant; Dielectric losses; Dielectric materials; Frequency; High-K gate dielectrics; Laboratories; Polymers; Solvents; BaTiO3; carbon nanotube; dielectric constant; three-phase composites;
Conference_Titel :
Properties and Applications of Dielectric Materials, 2009. ICPADM 2009. IEEE 9th International Conference on the
Conference_Location :
Harbin
Print_ISBN :
978-1-4244-4367-3
Electronic_ISBN :
978-1-4244-4368-0
DOI :
10.1109/ICPADM.2009.5252146
