| Tailoring favor crystalline structure via electrospun PVDF/BaTiO3 nanofibers |
| Paper ID : 1027-UFGNSM-FULL |
| Authors: |
|
sobhan sharafkhani *1, Mehrdad Kokabi2 1Tehran
Jalal AleAhmad
Nasr
P.O.Box: 14115-111 2Polymer Engineering Department, Faculty of Chemical Engineering, Tarbiat Modares University, P.O. Box: 14115-114, Tehran, Islamic Republic of Iran |
| Abstract: |
| Piezoelectric polymers such as poly (vinylidene- fluoride) (PVDF) are one of the most attractive candidates for sensor and actuator devices because of their high flexibility, light-weight, and ease of processability. PVDF is consists of different crystalline phases, including α, β, γ, and δ which are appeared with respect to the process conditions. In contrast to the antiparallel and random distributed dipoles of the non-polar α-phase, the polar β-phase with the maximum dipole moments is responsible for the reasonable piezoelectric properties in PVDF. Among the different processing approaches, electrospinning is an applicable, reliable and low-cost method to convert the non-polar α-phase into the polar β-phase in PVDF. Moreover, nanofibers with lower diameters exhibit superior piezoelectric conversion ability because of the more specific surface area and the higher degree of crystallinity. On the other hand, it has been reported that BaTiO3 ceramic nanoparticles with high piezoelectric constant can act as β-phase nucleation and improve the piezoelectricity of the PVDF films. Here, PVDF nanofibers containing 0.4 and 0.8 wt% BaTiO3 nanoparticles with entirely regular and uniform morphology and an average diameter of 93 nm were electrospun. According to scanning electron microscopy (SEM) micrographs, BaTiO3 nanoparticles caused a noteworthy decrease in PVDF nanofibers diameter. Fourier transform infrared spectroscopy (FTIR) results confirmed that the polar β-phase was successfully induced in the crystalline structure of PVDF nanofibers. Furthurmore, the intensity of the β-phase in PVDF nanofibers was significantly promoted by increasing the low amount of BaTiO3 nanoparticles. The crystalline structure of the untreated PVDF thin films were also studied comparably. The results showed that β-phase crystals do not appear in the untreated PVDF thin films. |
| Keywords: |
| PVDF nanofibers; BaTiO3 nanoparticles; crystalline structure; electrospinning; β-phase; |
| Status : Paper Accepted (Poster Presentation) |
