High T-g, processable fluorinated polyimides containing benzoisoindoledione unit and evaluation of their gas transport properties

作者：Sen Suman Kumar^*; Banerjee Susanta

来源：RSC Advances, 2012, 2(15): 6274-6289.

DOI：10.1039/c2ra20447a

This article describes the preparation of a series of processable fluorinated poly(ether imide)s from a new diamine monomer 4,9-bis-[4-(49-amino-3-trifluoromethyl-biphenyl-4-yloxy)-phenyl]-2-phenylbenzo[f]-isoindole-1,3-dione. The polymers showed extremely high T-g (up to 335 degrees C), outstanding thermal stability (up to 559 degrees C) and high tensile strength (up to 102 MPa). The transparent (lambda(cut-off) >= 363 nm) membranes from these polymers were investigated for their gas transport properties for CO2, O-2, N-2 and CH4 at three different temperatures. The effect of the benzo[f]isoindole-1,3-dione moiety and the aromatic dianhydrides (BPADA, 6FDA, BTDA, ODPA and PMDA) towards the glass transition temperatures of the polymers and their consequences on gas transport properties have been investigated. The polymer prepared from 6FDA showed the highest permeability coefficient for all the gases (P-CO2 = 71.3, P-O2 = 25.4) whereas BPADA based polymer exhibited the highest permselectivity (CO2/CH4 similar to 37.2 and O-2/N-2 similar to 8.4), staying closer to the latest upper boundary limit drawn by L. M. Robeson.

• 出版日期2012