کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5186425 | 1381104 | 2009 | 7 صفحه PDF | دانلود رایگان |
Four aromatic tetraamine monomers possessing flexible ether linkages were successfully synthesized by nucleophilic aromatic substitution of hydroquinone, 4,4â²-dihydroxybiphenyl, 2,2â²-bis(4-hydroxyphenyl)propane, and 2,7-dihydroxynaphthalene with 5-chloro-2-nitroaniline, followed by reduction, respectively. With these monomers, a new class of soluble poly[bis(benzimidazobenzisoquinolinones)] was prepared by a one-step, high-temperature solution polycondensation. The resulting polymers were completely soluble in phenolic solvents and had high inherent viscosities ranging from 1.2 to 1.5 g dLâ1. These polymers had glass transition temperatures in the range of 427-449 °C. Thermogravimetric analysis showed that all polymers were thermally stable, with 5% weight loss recorded above 510 °C in nitrogen. The tough polymer films, obtained by casting from solution, had tensile strength, elongation at break, and tensile modulus values in the range of 79.5-114.5 MPa, 10.3-23.0%, and 1.1-1.7 GPa, respectively. It is demonstrated that these semiladder polymer membranes displayed high CO2 permeability coefficients (PCO2=31.6â96.5barrer) and permeability selectivity of CO2 to CH4(PCO2/PCH4=30.6â43.4).
Journal: Polymer - Volume 50, Issue 3, 28 January 2009, Pages 810-816