Synthesis, characterization and properties of polyimides from 3,3?,4,4?-benzophenonetetracarboxylic dianhydride and imidazole-blocked 2,5-bis[(n-alkyloxy)methyl]-1,4-benzenediisocyanates

High performance polyimides for applications in microelectronics and flat panel displays

“…Thus, there still is a big challenge to improve their brittleness and dielectric constant with retaining the high moduli. Attempts to improve such drawbacks with a little sacrifice of the high modulus have been made in two different ways: (i) incorporation of short side groups into the polymer backbone [89][90][91][92][93][94][95][96][97][98][99] and (ii) insertion of proper linkages into the polymer backbone. 6 There are two options in incorporating short side groups into the polymer rod.…”

“…89,[94][95][96][97][98][99] And, some benzidine (BZ) derivatives with short side groups are also available: 2,2'-bis(methyl)benzidine (MEBZ), 2,2'-bis(methoxy)benzidine (MEOBZ), 2,2'-bis (fluoro) benzidine (FBZ), 2,2'-bis(trifluoromethyl)benzidine (CF3BZ), 3,3'-hydroxy-4,4'-diaminobiphenyl (HAB), and o-tolidine (TDI). 90,92,95,135 On the other hand, several research groups 91,93,100-103 have attempted to incorporate short side groups into pyromellitic dianhydride (PMDA).…”

Photoluminescence, thermal and surface properties of triarylimidazole-containing polyimide nanocomposite films

“…According to the literatures, [23][24][25][26][27][28][29] the synthesis steps of triphenylimidazole-containing diamines are shown in Scheme 1.…”

“…21,22 Besides, imidazole structures are commonly used as luminescent group to endow PI with some photoluminescence properties. [23][24][25][26][27][28][29] However, the uorescence quantum yields of these PIs need to be further increased to meet the practical applications. [30][31][32] Therefore, it is of great signicance to propose some methods to prepare and improve the uorescence properties, except molecular structure design.…”

Solubility, thermal and photoluminescence properties of triphenyl imidazole-containing polyimides

“… 39–41 Moreover, large volume heterocyclic rings is helpful to improve or maintain the thermal stabilities of polyimides. 38,39 However, the fluorescence quantum yield of aromatic polyimides is very low, which could not meet the needs of practical application. 42,43 The conjugation of aromatic polyimide backbones and intramolecular or intermolecular charge transfer (CT) transition significantly cause fluorescence to be weakened or quenched.…”