Synthesis of soluble and thermally stable polyimide from new diamine bearing N-[4-(9H-carbazol-9-yl)phenyl] formamide pendent group

Synthesis and identification of organosoluble polyimides: thermal, photophysical and chemiluminescence properties

“…[6][7][8] Significant synthetic efforts in the area of high-performance polymers have been focused on improving the processability and solubility of PIs through the design and synthesis of new monomers. Various structural modifications can be made to the PI backbone to modify the polymer properties, such as insertion of flexible linkages on the main chain, 9-13 use of noncoplanar 14 or asymmetric monomers [15][16][17][18][19] and incorporation of pendant groups in the polymer backbone, [20][21][22][23][24][25][26][27][28][29] with results including lower interchain interactions or a reduced polymer chain stiffness. Depending on the type and amount of structural modifications, melting temperatures can be lowered and solubility improved, resulting in processable materials.…”

“…Introducing bulky pendant substituents and heteroaromatic rings into PI chains has been considered to be an efficient method to provide not only enhanced solubility but also good thermal and thermo-oxidative stability. 22 The rigidity based on the …”

Side-Chain Multifunctional Photoresponsive Polymeric Materials

“…A significant number of other polymers containing side-chain carbazole moieties are reported and discussed with reference to the influence of the macromolecular rigid main chain and the side-chain mobility on their photoresponsive properties: polystyrenes (Kanbara et al 2000;C. Chang et al 2010), poly(p-phenylenevinylene) (Vellis et al, 2008;Ravindranath et al, 2007), polyisocyanides (Schwartz et al, 2010) and poly((amino)amide)s (Thomas et al, 2001;Liou et al, 2006), polythiophenes (W. and polyimides (Ghaemy et al, 2009).…”

Synthesis and Characterization of Novel Polyamide-ethers Based on Bis-imidazole Containing Bulky Aryl Pendant Groups

“…Generally, the heterocyclic units in the main chain, and in the pendant structure, impart excellent thermal stability with improved solubility, which justifies the research efforts directed toward them [7][8][9][10][11][12] . The incorporation of bulky pendant groups can provide beneficial effects for solubility, because this approach produces a separation of chains, a weakening of hydrogen bonding, and a lowering of chain packing with a gain of free volume, which diminishes the T g s. On the contrary, bulky side groups also restrict molecular mobility, so that the overall observable effect is an increase in T g s. This counteracts the chain separation effect, and simultaneously improves the solubility [13][14][15][16][17][18][19][20][21][22] . So in order to prepare novel processable polyamideethers (PAEs) with enhanced thermal stabilities, new diamine monomer containing ether linkage based on bis-imidazole heterocyclic group and containing bulky aromatic pendant groups was synthesized and used for the preparation of PAEs.…”