Abstract:The transformation of a to b-phase in poly(vinylidene fluoride) (PVDF) induced by the addition of tetradecylphosphonic acid (TDPA)-BaTiO 3 nanoparticles and subsequently the isothermal crystallization kinetics of pristine PVDF and its nanocomposites have been investigated. The result of infrared spectra showed that the relative crystalline fraction of b-phase was enhanced greatly after the introduction of TDPA-BaTiO 3 nanoparticles, and reached the peak of 93% when the concentration of nanofillers was 20%. The… Show more
“…The interactions between the negatively charged particles and the polymer CH 2 groups, having a positive charge density, favors the nucleation of the β phase from the melt process [126]. It is interesting that the β PVDF nucleation was found to be dependent on the filler size but almost independent of the filler content [127]. It is believed that the nucleation is strongly influenced both by geometrical factors and interactions at the interface between the local electric field around the nanoparticles and the PVDF dipoles [125].…”
“…The interactions between the negatively charged particles and the polymer CH 2 groups, having a positive charge density, favors the nucleation of the β phase from the melt process [126]. It is interesting that the β PVDF nucleation was found to be dependent on the filler size but almost independent of the filler content [127]. It is believed that the nucleation is strongly influenced both by geometrical factors and interactions at the interface between the local electric field around the nanoparticles and the PVDF dipoles [125].…”
“…Some studies showed that the presence of charged fillers within the PVDF matrix can acts as crystallization directors to promote the crystallization of specific polar b or c phases of the PVDF polymer from the melt [29,30]. The presence of IL in this polymer matrix could, in this way, induce the crystallization in one of the electroactive phases of PVDF.…”
“…The desirable piezoelectric crystallization phase is b-phase, which has all-trans (TTTT) conformation is commonly achieved by biaxial stretching aphase lms, 5-7 electrical poling, 8 ultra-fast cooling, 9,10 or presence of llers. [11][12][13] The g-phase has a T 3 GT 3 G 0 conformation between that of a and b phases.…”
Uniform active films are highly desirable for electronic applications, but still challenging. This work proposed a convenient and effective approach for the production of uniform oriented PVDF thin films with high content of polar b-phase by blade shear. The obtained films not only had a smooth surface, but also achieved uniform component distribution. The results revealed that PVDF crystals preferentially oriented perpendicular to the shear direction and the largest relatively b-phase content was up to 93% calculated from FTIR. It was also found that an appropriate elevated temperature is helpful to the formation of alltrans b-phase with the aid of shear. The oriented uniform PVDF films showed outstanding switching and piezoelectric properties with a polarization switching voltage as low as 3 V and a relatively small coercive field of $6 MV m
À1. The observed properties may result from the enhancement of crystallinity of the bphase and the orientation of crystals. The results suggest that oriented PVDF films can be suitably implemented in the fabrication of electronic devices.
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