Synthesis of thermally robust benzimidazolone-based wholly aromatic polyketones

Abstract

A series of wholly aromatic polyketones bearing benzimidazolone moieties (PK-BI) were synthesized via N–C coupling polycondensation.

Engineering Poly(phthalazinone ether sulfone) Dielectric Films for Stable High-Temperature Capacitive Energy Storage

“…The rapid evolution of advanced electronics and electric power systems has greatly accelerated the advancement of energy-storage technologies. − Dielectric capacitors are at the forefront of this progress due to their ultrafast charge–discharge rates, which surpass those of conventional batteries and electrochemical supercapacitors, attracting significant interest in academia and various industries. , Compared to ceramic dielectrics, polymer counterparts stand out for their scalability, easy processing, lightweight, high breakdown strength, and minimal loss, making them the preferred materials for developing scalable high-energy-density capacitors. , However, a critical challenge with polymer dielectrics is the significantly reduced capacitive performance at elevated temperatures. , Taking the most widely used commercial dielectric film, bioriented polypropylene (BOPP), as an example, the discharge energy density ( U e ) value of BOPP capacitors under high electric field deteriorates sharply from 2 to 3 J/cm 3 at room temperature to 1 J/cm 3 at 120 °C, limiting its operational temperature to below 80 °C. , Therefore, there is an urgent need to develop new polymer dielectrics capable of maintaining high performance under extreme conditions …”