Synthesis and properties of soluble aromatic polyimides from novel 4,5-diazafluorene-containing dianhydride

Abstract

A dianhydride monomer containing 4,5-diazofluorene was synthesized, and the corresponding organo-soluble polyimides exhibited good comprehensive properties.

Studies of Formation Mechanism, Structure, and Properties of Network Copolymers Obtained by Cocuring of Rolivsan Thermosetting Resins with Aromatic Diamines

“…Assignment of chemical shifts in the spectra of neat ROLs and ROL-ADA blends was consistent with the previously reported data [17][18][19][20][21][22][23][24]. These data are related to 13 C atoms included in kindred structures (groups, units, or segments).…”

“…These peaks are attributed to MA units (m) [18] and MAA units (j) [18], respectively. Note that there is a significant difference between positions of 13 С (>C=O) signals of cyclic aliphatic (e.g., 1,2,3,4-cyclo-pentanetetracarboxylic dianhydride, 169.29 and 173.34 ppm [25]) and aromatic anhydrides (164.5 and 165.5 ppm [24]).…”

“…Unfortunately, the sought-for signals > 13 C=O (С-m and С-n) that arise upon formation of nonaromatic amide and imide derivatives of methacrylic acid (according to the scheme in Figure 7) also lie in this range [11,[23][24][25][26]. Thus, for example, the resonance lines at 177.5-177.8 and 173.9 ppm were assigned to the imide carbonyl in cycloaliphatic-aromatic polyimides [25].…”

Design and fabrication of photoactive imidazole-based poly(ether-imide)s and a polyimide/HBP-modified SiO2 composite: toward high heat-resistance, antimicrobial activity and removal of heavy metal ions

“…24,25 Other methods that have been developed in this eld include introducing electron-donating moieties, 26 heterocyclic segments, 27 aliphatic moiety, 28 exible linkages, 29 and spiro structure into the polyimide chains. 30,31 Ring components containing heteroatoms have been extensively incorporated into the backbone of thermostable polymers such as polyisocyanurate, polyureas, polyesters, polyimides, and polyamides, which progress the solubility of these polymers in organic solvents and enhance their chemical plus thermal resistance. [32][33][34][35][36] Imidazole and xanthene rings can be classied as one of the most prominent heterocyclic scaffolds in many elds including medicine and organic chemistry.…”

Synthesis, optical, and thermal properties of polyimides containing flexible ether linkage

“…The synthesis and development of soluble polyimides are still needed because of these unfavorable properties. Until today, polyimides with different functional groups such as flexible linkage, aliphatic chains, bulky CF 3 groups, nonplanar or ring‐shaped structures were synthesized to improve their solubility and processability . In this context, Leu and Wang synthesized a series of polyimides containing bisphenol unit, naphthalene group, or flexible ether linkage such as aryl ether in order to enhance their solubility and they also evaluated these functional groups effect on properties of polyimides …”