Achieving Secondary Dispersion of Modified Nanoparticles by Hot-Stretching to Enhance Dielectric and Mechanical Properties of Polyarylene Ether Nitrile Composites

Abstract

Enhanced dielectric and mechanical properties of polyarylene ether nitrile (PEN) are obtained through secondary dispersion of polyaniline functionalized barium titanate (PANI-f-BT) by hot-stretching. PANI-f-BT nanoparticles with different PANI content are successfully prepared via in-situ aniline polymerization technology. The transmission electron microscopy (TEM), fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopic instrument (XPS) and Thermogravimetric analysis (TGA) results confirm that the PANI layers uniformly enclose on the surface of BaTiO3 nanoparticles. These nanoparticles are used as functional fillers to compound with PEN (PEN/PANI-f-BT) for studying its effect on the mechanical and dielectric performance of the obtained composites. In addition, the nanocomposites are uniaxial hot-stretched by 50% and 100% at 280 °C to obtain the oriented nanocomposite films. The results exhibit that the PANI-f-BT nanoparticles present good compatibility and dispersion in the PEN matrix, and the hot-stretching endows the second dispersion of PANI-f-BT in PEN resulting in enhanced mechanical properties, crystallinity and permittivity-temperature stability of the nanocomposites. The excellent performances of the nanocomposites indicate that a new approach for preparing high-temperature-resistant dielectric films is provided.

Design and properties of polyarylene ether nitrile copolymers with improved elongation at break

“…The texture of all PEN films are homogeneous and dense. Notably, the PEN (HQ/BP) film has the highest degree of orientation, and obvious lines can be observed in the cross‐sectional photos, which shows that this kind of PEN film is subjected to the greatest force and shows great toughness during stretching 26 . In addition, no obvious spherulites were observed in the cross‐sections of the four kinds of PEN films, which proves to a certain extent that these four PENs are all amorphous polymers.…”

Fabrication of BaTiO3-Loaded Graphene Nanosheets-Based Polyarylene Ether Nitrile Nanocomposites with Enhanced Dielectric and Crystallization Properties

“…As can be seen from the figure that the glass transition temperature (T g ) of the pure PEN was about 170.0 • C, and with the increase of the BT@ZnPc-GO content, the T g of the BT@ZnPc-GO/PEN nanocomposites present a slight increase. This is because the nanoparticles are regarded as the physical crosslink points in the PEN matrix, which limit the movement of molecular chains, resulting in improvement of the T g of the nanocomposites [27]. In addition, the PEN used herein has a certain degree of crystallization, which is due to the large number of rigid p-phenyl and m-benzene segments contained in this structure (Scheme 1).…”

“…Moreover, with the addition of a nucleating agent in the PEN matrix, the nucleating agent promotes crystallization while also reducing the optimal crystallization temperature. It has been reported that the crystallization behavior of the polymer will affect the dielectric properties of the polymer based composites [27]. Figure 11 shows the dielectric properties of BT@ZnPc-GO-1/PEN composite film as a function of heat-treatment temperature.…”

“…However, the dielectric constant of nanocomposites after heat treating at 310 • C is still higher than that treated at 200 • C. More importantly, the dielectric loss of nanocomposites by heat treatment at different high temperatures is quite lower than that treated at 200 • C. All these results indicate that the isothermal crystallization behavior has certain positive significance for improving dielectric properties. It has been reported that the crystallization behavior of the polymer will affect the dielectric properties of the polymer based composites [27]. Figure 11 shows the dielectric properties of BT@ZnPc-GO-1/PEN composite film as a function of heat-treatment temperature.…”

Recent progress on core-shell structured BaTiO3@polymer/fluorinated polymers nanocomposites for high energy storage: Synthesis, dielectric properties and applications

“…Although having many benefits, the final properties of the nanocomposite will not only depend on the constituting materials but also on the processing methods. Generally, there are different synthetic strategies to get such nanocomposites, including hot pressing [73] , spin coating [74] and melt stretching [75,76] (Scheme 1-b).…”