Reinforced properties of ethylene–propylene–diene monomer composites by vinyltrimethoxysiloxane functionalised barium titanate

Abstract

In this study, non-conductive ethylene-propylene-diene monomer (EPDM)/barium titanate (BaTiO 3 ) composites with high dielectric constant and low dielectric loss are prepared. Fourier transform infrared (FT-IR) spectra show the chemical adherence of vinyltrimethoxysiloxane oligomer (SG-Si6490) to the surface of BaTiO 3 particles. Functionalised BaTiO 3 particles have better compatibility with EPDM matrix and promote the cure properties of EPDM composites. It is found that when the content of BaTiO 3 increases to 40 vol.-%, the resistivity, rheological, dielectric and mechanical properties of EPDM/BaTiO 3 composites change drastically. The dielectric constant of EPDM with 50 vol.-% BaTiO 3 at 10 MHz is 15, which is 7.5 times higher than that of EPDM control. Meanwhile, the volume resistivity results show EPDM with 50 vol.-% BaTiO 3 is still non-conductive. As for mechanical properties, the tensile and tear strength of EPDM control increase from 1.45 MPa and 8.73 kN m −1 to 10.02 MPa (about seven times higher) and 24.65 kN m −1 (about three times higher), respectively.

Characterization of barium titanate reinforced acrylonitrile butadiene rubber composites for flexible electronic applications: influences of barium titanate content

“…showed a dielectric constant at 10 6 Hz, tensile strength and elongation at break of ENR 50 with 20 vol% BT to be ca 10, ca 17 MPa and ca 550%, respectively 5 . According to Su and Zhang, the incorporation of 20 vol% modified BT with vinyltrimethoxysiloxane into ethylene‐propylene‐diene monomer showed 5.50 MPa tensile strength and 121% elongation at break, while the dielectric constant was ca 6 at 6 × 10 5 Hz 10 . It was found that our BT/NBR composites exceeded the dielectric constant and tensile properties of other BT/rubber composites at the same BT loading and at the same measurement frequency, except for BT/ENR 50 having higher tensile strength than our composites.…”

“…9 However, sintering the powder will produce dielectric materials with several limitations like high brittleness, low breakdown strength and high dielectric loss, and requires high processing temperatures (>700°C ). 10 Nevertheless, the lack of interactions between a polymer matrix and an inorganic filler causes agglomeration of the filler, resulting in poor mechanical properties of the final composite. 11 The ways to increase interactions between fillers with a polymer include modifying either the filler surfaces or the available polar groups of the polymers.…”

“…11 The ways to increase interactions between fillers with a polymer include modifying either the filler surfaces or the available polar groups of the polymers. 12 Thus, some studies have investigated modifying the BT [13][14][15][16][17] and the application of coupling agents 10,[18][19][20] to improve the compatibility of BT with a polymer matrix. Acrylonitrile butadiene rubber (NBR) is a prospective candidate for flexible dielectric materials because it exhibits a comparatively high dielectric constant (>10), good mechanical flexibility, easy processability, low cost and strong polarization.…”

“…Synthesis by a solid‐state reaction can produce fine BT powder with a narrow particle size distribution 9 . However, sintering the powder will produce dielectric materials with several limitations like high brittleness, low breakdown strength and high dielectric loss, and requires high processing temperatures (>700 °C) 10 . Nevertheless, the lack of interactions between a polymer matrix and an inorganic filler causes agglomeration of the filler, resulting in poor mechanical properties of the final composite 11 .…”

Natural Aging of Ethylene-Propylene-Diene Rubber under Actual Operation Conditions of Electrical Submersible Pump Cables

“…Two of the layers, insulation and jacket, are frequently made from EPDM rubber with mutually distinct functions and properties. The insulation layer is dedicated to envelop copper wires and, therefore, has to present a high dielectric strength [ 2 ], in addition to resistance to crude oil and gas penetration. The jacket, on the other hand, provides mechanical protection to inner layers and has to be resistant to percolation of fluids.…”