Preparation, characterization and degradation kinetics of transparent fluorinated polyimides with low dielectric constants and excellent hydrophobic properties

Factors influencing thermal, mechanical, optical, and adhesive properties of segmented poly(imide siloxane) copolymers films

“…where M 2 and M 1 are the weights of swollen and dry film, respectively. 5 Microscopic investigations were performed using an environmental SEM instrument (IT300) operating at 30 KV with secondary and backscattering electrons in high-vacuumed. Before analysis, the investigated films were covered with a thin layer of gold.…”

“…1,2 Owing to its good thermal stability, mechanical properties, and dielectric characteristics, PI has been widely used in aerospace and microelectronics industries, as insulating coatings for aircraft wires, thin films and coatings for microelectronic, etc. [3][4][5][6] It is well-known that, the outstanding properties of PI are closely associated with its chemical structure, molecular composition and intermolecular interactions, and generally the structure is modified to improve its properties. [7][8][9] So, PI can be synthesized by introducing different groups to incorporate diverse properties as per the requirements of different fields.…”

Synthetic strategies for highly transparent and colorless polyimide film

“…The T 400 of PI 6FDA‐6FDAM film is above 80% (0.5 μm) 62 . The PI 6FDA‐TFDB film (25 μm thick) has a T 400 of above 85.5% 101 …”

“…62 The PI 6FDA-TFDB film (25 μm thick) has a T 400 of above 85.5%. 101 Li et al 103 used four kinds of ionic liquids to modify PI 6FDA-TFDB and prepared a series of approximately 23-μm-thick PI composite films. The result shows that the addition of 1-ethyl-3-methylimidazoliumbis ((trifluoromethyl)sulfonyl)imide (IL1) containing-CF 3 could effectively reduce the chains packing.…”

Effects of diamine isomers on the properties of colorless and transparent copoly(amide imide)s

“…Several approaches have been used to prepare transparent and colorless PIs, such as introducing a curved structure in the main chain to reduce linearity, bulk substituents in the main chain to reduce intermolecular packing, and the introduction of strong electron-withdrawing elements such as uorine. 50,51 In general, the introduction of -CF 3 groups, which are very strong electron withdrawing groups, can improve the optical properties of polymers. In addition, the introduction of bulky side groups will reduce the packing density between polymer chains, further reducing intermolecular interactions between polymer chains.…”