Improvement of dielectric constant and mechanical properties of thermoplastic polyurethanes using surface modified strontium titanate

Abstract

AbstractRecently, the focus of research in electronic industry has shifted toward obtaining high‐charge‐storing materials. Inspired by the trends in recent technological advancements, we proposed to fabricate a promising composite with a high‐dielectric constant, high‐thermal stability, good mechanical property, and excellent resistance to stiffness. We used thermoplastic polyurethane (TPU) as the matrix and strontium titanate (SrTiO3) particles as a filler to obtain the required properties. To address the incompatibility between the TPU matrix and SrTiO3 particles, the surface of SrTiO3 particles was functionalized with isophorone diisocyanate (IPDI). The functionalization of SrTiO3 particles with IPDI molecules was confirmed through various investigations: Fourier transform infrared spectroscopy, thermogravimetric analysis, X‐ray photoelectron spectroscopy, and field emission scanning electron microscopy analysis were performed. Low‐speed melt extrusion methods were used to fabricate the composite materials. The composite materials possessed higher thermal stability, high‐dielectric constant (three times that of neat TPU at 1 MHz), and mechanical properties with high stiffness.