New semiladder polymers: III. Synthesis and properties of new poly(etherimidazopyrrolone)s

Synthesis and properties of soluble poly[bis(benzimidazobenzisoquinolinones)] based on novel aromatic tetraamine monomers

“…where P is the permeability coefficient of a membrane to gas in barrers (1 barrer ¼ 10 À10 cm 3 [STP] cm cm À2 s À1 cm Hg À1 ), V is the downstream volume, L is the membrane thickness, A is the effective area of the film, R is the universal gas constant, T is the absolute temperature, Dp is the transmembrane pressure (Dp ¼ p 2 À p 1 , where p 2 and p 1 are the upstream and downstream pressures, respectively), and DpDt is the steady rate at which the pressure increases on the downstream side. The temperature was controlled within AE1 C with a thermal regulator connected to a heater in the permeation cell wall.…”

“…polypyrrolones (PPys) [1] and poly[bis(benzimidazobenzisoquinolinones)] (PBIBI) [2]. Polypyrrolones, which synthesized by further thermal cyclization of polyimide backbone with amine groups in the a-position to the imide groups [-N(C]O) 2 ], possessed better thermal stability than polyimides because of their more rigid and multiaromatic structures in the polymer backbone [3][4][5]. It was reported that the PPy films also exhibited excellent alkaline hydrolysis stability, which retained their original shapes and toughness after boiling 7 days in 10% sodium hydroxide solution [6].…”

Novel High Temperature Polypyrrolones with Asymmetric Biphenyl Moieties in the Main Chain: Synthesis and Characterization

“…Few promising results have been reported until now. For instance, Sek and coworkers [9] reported on the processable polypyrrolones with flexible ester segments in the main chain, derived from commercial available tetra-amines and new dianhydrides. Their poly (esterimidazopyrrolone)s were prepared by a one-step high temperature polycondensation procedure due to their good solubility in m-cresol or p-chlorophenol.…”

Optical Properties of Semiladder Polymer Foils

“…Introducing to the single-chain segments of some flexible groups such as amide, ether and ester between ladder segments should improve the solubility, but may influence the thermal stability of such semiladder polymers. Due to very poor solubility, determination of the molecular weight of investigated polymers was difficult; only the values of the reduced viscosity have been obtained and presented in [4][5][6]. The amorphous character of the polyimidazopyrrolone foils structure has been proved by X-ray diffraction method [7] and also by differential scanning calorymetry (DSC) investigations.…”

“…The amorphous character of the polyimidazopyrrolone foils structure has been proved by X-ray diffraction method [7] and also by differential scanning calorymetry (DSC) investigations. The process (655) of synthesis and some other properties of polyimidazopyrrolones (pyrrons) have been described in detail in papers [4][5][6].…”