Evaluation of poly(4‐methyl‐1‐pentene) as a dielectric capacitor film for high‐temperature energy storage applications

Abstract

Poly(4‐methyl‐1‐pentene) (P4MP) was characterized to evaluate its viability as a high‐temperature dielectric film for capacitors. Detailed investigation of thermal, mechanical, rheological, and dielectric properties was carried out to assess its high‐temperature performance and processability. P4MP was melt‐processable below 270 °C without degradation and application temperatures as high as 160–190 °C can be achieved. The dielectric constant and loss of melt‐processed P4MP films was comparable to biaxially oriented polypropylene (BOPP) capacitor films, although the dielectric strength was lower. Enhancements in dielectric strength up to 250–300% were achieved via solution‐processing P4MP films, which could be easily scaled up on a roll‐to‐roll platform to yield isotropic, free‐standing films as thin as 3–5 μm. The influence of crystal structure, crystallinity, and surface morphology of these films on the dielectric properties was examined. The dielectric strength was further increased by 450% through biaxial stretching of solution‐cast films, and a Weibull breakdown field of 514 V/μm was obtained. The dielectric constant was very stable as a function of frequency and temperature and the dielectric loss was restricted to <1–2%. Overall, these results suggest that BOP4MP is a promising candidate to obtain similar energy density as a BOPP capacitor film but at much higher operating temperatures. © 2017 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2017, 55, 1497–1515

Effect of arrangement of nano and micro barium titanate (BaTiO3) particles on the enhanced dielectric constant of high‐density polyethylene (HDPE)/BaTiO3

“…This is because when the particle ratio is 2 and the small particles can enlarge the gap among large particles. In this way, there needs more amount of small particles to increase the packing density of binary particles in the composite …”

“…It is seemed that in binary particle system, when the particle ratio is 8 and 4, the small particles can fill in the triangle holes and four angle holes among large particles, respectively. 23,27 By comparison, when the particle ratio is 2, the small size particles are so large that the small size particles crowd with medium size particles, rather than fill in the space formed among medium size particles. 23,24 Figure 4 illustrates the scanning electron micrographs of fractured surface of HDPE with binary BaTiO 3 .…”

“…this way, there needs more amount of small particles to increase the packing density of binary particles in the composite. 23,24,26,27 Relative Crystallinity of HDPE with Binary BaTiO 3 Particles Table 2 shows the relative crystallinity of HDPE with binary The reason is that as for HDPE/L-BT/S-BT (D L /D S 5 8) and HDPE/L-BT/M-BT (D L /D M 5 4), 10 vol % small size particles can fill in the interstitial space among large particles to restrict the motion of HDPE macromolecular chains. 9 In this way, it is difficult for macromolecular chains to align into crystal lattices, leading to the drop of relative crystallinity.…”

Thermally-inverted strain-optical and stress-optical behavior of poly(4-methyl-1-pentene) in rubbery state

“…Poly(4-methyl-1-pentene) (P4MP) has recently attracted renewed attention as a promising polymer for high-temperature energy storage applications [1,2]. Dielectric polymer films are commercially fabricated by either melt-processing or solution-processing followed by polymer chain orientation through uniaxial or biaxial stretching.…”

Laser emission in a 3D nanoporous polymer replica of amorphous blue phase III

“…This device presents a novel platform for the integration of the advantages of laser emission and the mechanical strength and wide tunability offered by polymer-based three-dimensional nanostructures. 2,[24][25][26] It is evident that the physics of the underlying photonic mechanism of this system is very rich and is bound to provide us with opportunities for new discoveries. For instance, it would be interesting to tune the laser threshold energy of the BPIII random laser by optimizing the pore size, that is, the density of the polymer network in the BPIII scaffold, such that it allows for enhanced localization and entrapment of light in the system.…”