A review on colorless and optically transparent polyimide films: Chemistry, process and engineering applications

Phosphonated polyimides: Enhancement of proton conductivity at high temperatures and low humidity

“…However, random copolyimides were prepared successfully using "two-step" method, as shown in Scheme 2. This method is widely used in the literature for preparation of polyimides form various monomers using either chemical or thermal cyclization dehydration procedures [47][48][49]. In the first step, dark red viscous solution of poly (amic acid) was obtained which was poured dropwise into a large excess of methanol to precipitate a brown solid.…”

Interfacial adhesion behavior of polyimides on silica glass: A molecular dynamics study

“…In particular, PI is one of the most favorable substrate materials used in the production of flexible displays as they largely determine performance and reliability of the display. [5] [7], Although conventional plastic materials are shock-resistive, lightweight, chemically stable, easy to form in various shapes, suitable for continuous process, insulating, and optically transparent, their poor thermal stability has limited their use as flexible substrates for display applications. [8] [9], Specifically, during flexible display manufacturing, the processing temperature can rise above 300 C, over which most plastic materials decompose [9].…”

Preparation and properties of heat-sealable polyimide films with comparable coefficient of thermal expansion and good adhesion to copper matrix

“…Wholly aromatic polyimide (PI) films have been successfully used in modern industry for half a century due to their excellent comprehensive properties both in ordinary and in extreme environments [1][2][3][4][5]. However, most of the commercially available PI films possess poor thermoplastic nature, which cannot be processed via common heat sealing procedures because they usually decompose before reaching a molten state at elevated temperatures.…”

“…Experimental 2.1. Materials 2,3,3',4'-Oxydiphthalic anhydride (aODPA), 4,4'-oxydianiline (ODA), 2-(4-aminophenyl)-5-aminobenzimidazole (4APBI) and 2-(3-aminophenyl)-5-aminobenzimidazole (3APBI) were purchased from Changzhou Sunlight Pharmaceutical Co., Ltd., Jiangsu, China. The diamines were used as received and aODPA was dried in vacuo at 150 °C for 12 h prior to use.…”