Rising of Dynamic Polyimide Materials: A Versatile Dielectric for Electrical and Electronic Applications

Abstract

Polyimides (PIs) are widely used in circuit components, electrical insulators, and power systems in modern electronic devices and large electrical appliances. Electrical/mechanical damage of materials are important factors that threaten reliability and service lifetime. Dynamic (self‐healable, recyclable and degradable) PIs, a promising class of materials that successfully improve electrical/mechanical properties after damage, are anticipated to solve this issue. The viewpoints and perspectives on the status and future trends of dynamic PI based on a few existing documents are shared. The main damage forms of PI dielectric materials in the application process are first introduced, and initial strategies and schemes to solve these problems are proposed. Fundamentally, the bottleneck issues faced by the development of dynamic PIs are indicated, and the relationship between various damage forms and the universality of the method is evaluated. The potential mechanism of the dynamic PI to deal with electrical damage is highlighted and several feasible prospective schemes to address electrical damage are discussed. This study is concluded by presenting a short outlook and future improvements to systems, challenges, and solutions of dynamic PI in electrical insulation. The summary of theory and practice should encourage policy development favoring energy conservation and environmental protection and promoting sustainability.

Water‐Driven Malleable, Weldable and Eco‐Friendly Recyclable Carbon Fiber Reinforced Dynamic Composites†

“…60.0% for the original one). The slight alteration of mechanical properties can be explained by an increase of crosslink density, [ 30 ] self‐crosslinking [ 31 ] or hyper‐crosslinked polyaminal [ 20b,32 ] under hot‐pressed process at 110 °C.…”

“…Gratifyingly, the tensile tests of fluoropolyimine films revealed an overall growth trend in terms of the stress at break (23.7 MPa for the thermally recycled one vs. 12.7 MPa for the original one), the elasticity modulus (757.8 MPa for the thermally recycled one vs. 257.4 MPa for the original one), and the toughness (8.16 MJ/m 3 for the thermally recycled one vs. 5.52 MJ/m 3 for the original one), except for a slight reduction in the strain at break (41.7% for the thermally recycled one vs. 60.0% for the original one). The slight alteration of mechanical properties can be explained by an increase of crosslink density, [30] self-crosslinking [31] or hyper-crosslinked polyaminal [20b,32] under hot-pressed process at 110 °C.…”

Optimizing the gradient of electric field distribution and inhibiting charge injection in multilayer dielectric films for high capacitive performance

“…4–6 Currently, dielectric polymers include linear polymers and ferroelectric polymers, among which linear polymers possess an inferior dielectric constant ( ε r ), inducing inadequate U d (<8 J cm −3 ), and ferroelectric polymers, due to inefficiency ( η ∼ 50–60%) under the critical electric field, exist huge energy loss. 7,8 With the aim of optimizing the U d of dielectric polymers, the construction of inorganic/organic nanocomposites, 9,10 the strategy of constructing sandwich structures, 11,12 and the design of polymer molecular structures 13 have been extensively explored.…”

Tunable Band Engineering Management on Perovskite MAPbBr3/COFs Nano‐Heterostructures for Efficient S–S Coupling Reactions

“…[10] However, the classic synthesis strategies of disulfide bonds currently encounter separation challenges arising from leaving groups in the S─S coupling, which is not in line with green chemistry and restricts industrial applications. [11][12][13][14] Considering free_ radical-triggered coupling reactions, precise problem-oriented tailoring and tuning for desired active radicals is an advanced bottom-up strategy. [15][16][17] In view of this, the solar-driven photocatalytic reaction system is a preferred choice due to the advantages of exciting photogenerated carriers to generate various free radicals, [18][19][20][21][22] such as ⋅O − 2 , 1 O 2 , •OH, and ⋅SO − 4 , as well as hydrogen peroxide.…”