Transparent fluorinated poly(imide siloxane) copolymers with good adhesivity

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

“…TGA curves of the polymers are shown in Figure 5. 3 This could be due to the lower decomposition temperatures of alkyl moieties and Si-CH 3 moieties in the siloxane segment compared to imide ring and aromatic segment. The T d5% values were in the range of 435 C to 460 C, whereas the T d10% values were in the range of 460 C to 484 C, which were lower than those of traditional PI films (T 5% range from 480 C to 530 C and T 10 % range from 490 C to 560 C).…”

“…[7][8][9] So, PI can be synthesized by introducing different groups to incorporate diverse properties as per the requirements of different fields. 6,9,[12][13][14][15] Novak et al 3,[15][16][17] studied the correlation between surface structure of poly(imide-siloxane) block copolymer and its adhesive property. Excellent adhesive properties, high impact resistance, low dielectric constants, and favorable overall thermal and mechanical properties have led to poly(imide-siloxane) (PIS) copolymers being noticeable and potential branch of novel polyimides and widely studied in the applications of high-performance adhesives and coatings, but their films adhesions to metal are rarely reported.…”

“…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.…”

Synthesis and optical properties of novel soluble and optically transparent semifluorinated poly (ether imide)s

“…Yang et al have reported a series of colorless PEIs derived from fluorinated bis(ether amine)s. The resulting PEIs exhibited excellent solubility in various organic solvents and showed a high optical transparency with cutoff absorption wavelength below 382 nm and yellowness index less than 11.7 together with low moisture absorptions ranging from 0.11 to 0.36%. However, the high cost of the fluorine‐containing monomers, the reduction of thermal and mechanical properties, and their drawback of poor adhesion of the fluorinated PIs with other substrates leading to a bad contact with other materials surface due to the incorporation of fluorine‐containing substituents, which greatly limited their further applications. Therefore, the replacement of the fluorinated diamine or fluorine‐containing dianhydride monomers is essential to prepare soluble and optically transparent PI films without sacrificing their solubility, mechanical, and thermal properties.…”

“…However, the high cost of the fluorine-containing monomers, the reduction of thermal and mechanical properties, and their drawback of poor adhesion of the fluorinated PIs with other substrates leading to a bad contact with other materials surface due to the incorporation of fluorine-containing substituents, 21 which greatly limited their further applications. Therefore, the replacement of the fluorinated diamine or fluorine-containing dianhydride monomers is essential to prepare soluble and optically transparent PI films without sacrificing their solubility, mechanical, and thermal properties.…”