Crystal structure‐flashover performance correlation in polybutylene terephthalate: Insights into the mechanism

Abstract

A deep understanding of the main factors affecting the insulating properties of polymers is essential for the progress of insulation components in various applications, including electric vehicles, electronic devices, and information technology. In this study, we used polybutylene terephthalate (PBT) samples with varying degrees of crystallinity as a model material to investigate the influence of aggregation structure on its electrical performance. The results revealed that increasing the crystallinity of PBT led to a simultaneous increase in the surface flashover voltage. We identified the amorphous region as the weak link in the aggregation structure of PBT. Compared to the amorphous region, the crystalline region exhibited superior resistance to charged ion bombardment, a higher degree of compactness, higher bulk resistivity, and lower surface resistivity. A comprehensive understanding of the relationship between the aggregation structure and electrical performance of polymers is fundamental for developing practical high‐performance insulation components. This study provides valuable guidance for controlling the electrical performance of polymers with high‐performance insulating properties, and is thus of great significance to the electrical aging field.

Integrated Fibrous Iontronic Pressure Sensors with High Sensitivity and Reliability for Human Plantar Pressure and Gait Analysis

“…Portable flexible sensing systems (FSSs) for plantar pressure have gained significant attention in recent research since they can demonstrate the motion status, posture, and related physiological information on foot patients in real time, which can promote personalized rehabilitation and medical treatment. , Existing works have demonstrated that increasing the size of the sensor, adding a support frame, or enhancing the deformability of the structure can result in flexible sensors that have a plantar pressure detection functionality. − In these studies, researchers focused on the gait analysis, real-time monitoring of human movement status, − coordination of human balance, or customized insoles. − Interesting applications have also been carried out in the fields of foot disease prevention and detection, ,,− spatial resolution of plantar pressure, , and rehabilitation training monitoring systems. ,, However, during normal daily activities, human feet are subjected to compressive pressures, tangential forces, or two complex coupled forces and long-term dynamic conditions (Figure S1). To meet the high accuracy of plantar pressure sensing under complex dynamic conditions, the miniaturization of devices is an inevitable trend.…”

Effect of Thermal Aging on Mechanical Properties and Morphology of GF/PBT Composites

“…Chen et al [ 14 ] conducted accelerated aging experiments on PBT at high temperatures, indicating that during the thermal aging process, phenomena such as terminal hydroxyl oxidation, polymer chain breakage, and the formation of oxidative cross-linking between macromolecules are prone to occur, severely damaging the performance of PBT materials. Zhang et al [ 15 ] studied a series of crystalline PBT materials and analyzed the correlation between their electrical properties and crystallinity. The results showed that as the crystallinity of PBT increased, the surface flashover voltage of the PBT materials increased.…”