Enhanced electrical insulating properties of polyethylene by incorporating polyethylene‐g‐polystyrene graft copolymers

Abstract

Aiming at utilizing the electron energy absorption characteristic of the benzene ring in polystyrene (PS) to enhance the electrical properties of insulation, here linear low density polyethylene grafted PS graft copolymers (LLDPE‐g‐PS) have been synthesized by pre‐irradiation and suspension grafting technology. Then, LLDPE‐g‐PS was added in LLDPE to prepare LLDPE/LLDPE‐g‐PS blends, of which the microstructure and thermal, rheological, electrical and mechanical properties were systematically investigated. Scanning electron microscopy showed that no interfacial debonding occurred in the blends. Rheological measurements showed that the viscoelastic properties of the blends were roughly the same as those of LLDPE. In terms of electrical properties, as LLDPE‐g‐PS was added, the injection of space charges was markedly suppressed. Meanwhile, all blends presented higher DC breakdown strength and the maximum was 1.45 times higher than that of LLDPE. Besides, blends exhibited little change in mechanical properties compared with LLDPE when PS contents were lower than 10 wt%. This investigation proposes an efficient method to improve the electrical properties of insulating materials. © 2020 Society of Industrial Chemistry

Effects of modified hexagonal boron nitride on electrical insulation properties of LLDPE/EAA nanocomposites

“…Compared with LLDPE, the LLDPE/EAA blend showed an obvious sea-island structure, and most EAA particles revealed a rough structure (highlighted by the red circles), indicating that there was a strong interfacial interaction between LLDPE and EAA. 24 This is because the main chain of EAA is the same as that of LLDPE. The melting and crystallization curves of LLDPE and LLDPE/EAA blends are presented in Fig.…”

“…Figure 1(a) presents the cross‐sectional SEM micrographs of the freeze‐brittle fracture of LLDPE and A 2 blend. Compared with LLDPE, the LLDPE/EAA blend showed an obvious sea–island structure, and most EAA particles revealed a rough structure (highlighted by the red circles), indicating that there was a strong interfacial interaction between LLDPE and EAA 24 . This is because the main chain of EAA is the same as that of LLDPE.…”

Preparation and properties of reinforced SEBS‐based thermoplastic elastomers modified by PA6

“…[ 10 ] Nevertheless, the methods of using inorganic fillers have to be added at high loading levels to obtain sufficient reinforcement effect, which will also bring some limitations because of the agglomeration and uneven dispersion. [ 11 ]…”

“…[10] Nevertheless, the methods of using inorganic fillers have to be added at high loading levels to obtain sufficient reinforcement effect, which will also bring some limitations because of the agglomeration and uneven dispersion. [11] Due to the advantage of combining desirable properties of several polymer components, blending technology has become an established method for producing multifunctional thermoplastic materials. [12][13][14] Polyamide 6 (PA6) has attracted wide attention as they posed high mechanical strength and wear resistance [15,16] and often used as a reinforcer in various polar composite materials to form polymer alloy systems and overcome the shortages of single polymers, such as PS/PA6 [17] and PPS/PA6.…”