Effect of dispersant viscosity for self-assembly process of barium titanate aggregates in material texture of polyvinylidene fluoride composites —evaluation of multifractal dimension (Dq [q = 0, 1, 2]) and dielectric properties—

Mariko TAKEDA, Haruna YAMAZAKI, Yoshihiro SATO, Makoto TANIMURA, Yasuhide INOUE, Yasumasa KOYAMA, Fumio MUNAKATA
2022 Journal of the Ceramic Society of Japan  
In this paper, the properties of the barium titanate (BT)/polyvinylidene fluoride (PVDF) composites were controlled by the self-assembly of the BT secondary particle groups. The self-assembled BT/PVDF composites of 520 vol.% BT were prepared with the difference in the viscosity of polyethylene glycol (PEG) of dispersants involved in the self-assembly process. The multifractal properties and dielectric properties of the self-assembled BT/PVDF composites were investigated with controlling by the
more » ... ormation of the self-assembled BT secondary particle groups. The dielectric constant (¾¤) increased with an increase in the average secondary particle area (S) of the BT particles. The S increased with an increase in the viscosity of PEG; whereas, the ¾¤ decreased with the increase in viscosity. The multifractal analysis indicated that the distribution of self-assembled BT secondary particle groups was affected by PEG viscosity. The sample with PEG1000 had aggregates with a BT/PVDF/BT heterointerface, the sample with PEG20000 had agglomerates with a BT/BT interface, and the sample with PEG2000 had both, aggregates and agglomerates. The BT/PVDF/BT heterointerface in the BT aggregates played an important role in improving the dielectric properties of the BT/PVDF composites. Overall, the viscosity of the dispersant affected the self-assembly process as well as the ¾¤. It was suggested that the multifractal properties and dielectric properties were controlled by the self-assembly of the BT secondary particle groups.
doi:10.2109/jcersj2.21094 fatcat:f2hmwoef4fahvndcjkt7aesozi