Effects of B₂ O₃ addition on structural and dielectric properties of PVDF

Abstract

a-Crystalline form of PVDF doped with Boron oxide (B 2 O 3) composite films were produced between 0.2 and 1% weight ratio via the casting procedure. This low-level doping rate did not change the crystalline structure of PVDF; however, they increased the lower and upper glass transition temperatures, which are associated with the amorphous ratio of polymer. This increment was found to be the highest for the sample 0.8% B 2 O 3 -doped PVDF as 25 and 9.7%, respectively. Because of the low specific volume occurred in the 0.8% doped sample, B 2 O 3 molecules are closer to the side groups of PVDF and, therefore, the coordination bonds also occurred according to the interaction between them and as a result of this interaction a geometric deformation occurred on the morphology of B 2 O 3 . In consequence of this deformation, morphology of B 2 O 3 gained net dipole moment and provided a contribution to the dipole moment density of the structure. Hence, higher dielectric constant values obtained than that of pure PVDF. At 1 kHz and 300 K, the real dielectric constant increased by 236% compared to that of pure PVDF. It was shown experimentally by the 0.8% doping level of B 2 O 3 that decreasing porous and gap structure resulted a high dielectric constant.

A comprehensive review on poly(vinylidene fluoride) from a theoretical and multimodal applications perspective

“…PVDF is a very interesting polymer in the field of polymers because it has several different polymorphic phases. 14,15 These different polymorphic phases are obtained by applying different crystallization temperature, external pressure, electric field etc. Here we will discuss some phases of this polymer in the following sections.…”

Progress of heat resistant dielectric polymer nanocomposites with high dielectric constant

“…With the continues increase of temperature, D K of the polymer reduces, this maybe results from the pronounced effect of thermal expansion of the matrix, and thus decreased charge density (net charge/volume) [152].…”

“…As the temperature approaches T g , the chain mobility of polymer increases and polar groups start to move in response to the applied electric field, leading to increased orientation of molecules and D K [151]. With the continues increase of temperature, D K of the polymer reduces, this maybe results from the pronounced effect of thermal expansion of the matrix, and thus decreased charge density (net charge/volume) [152].…”

Preparation and Combustion Performance of B/PVDF/Al Composite Microspheres

“…Eliminating the oxide layer on the surface of B NPs can effectively increase their combustion efficiency. As reported, fluorine-containing salts like LiF [24,25], Na 3 AlF 6 [26] and polyvinylidene fluoride (PVDF) [27][28][29] can be employed as additives to effectively remove the oxidized B 2 O 3 . As a commercial fluorinated polymer, PVDF prevents the oxidation process of metal NPs because PVDF is a protecting layer which prevents the contact with O 2 .…”