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3577306 
Journal Article 
Sulfonated poly(ether imide): A versatile route to prepare functionalized polymers by homogenous sulfonation 
Pinto, BP; de Santa Maria, LC; Sena, ME 
2007 
1 
Materials Letters
ISSN: 0167-577X
EISSN: 1873-4979 
61 
11-12 
2540-2543 
WOS:000246158300105 
This work deals with the PEI/ULTHEM sulfonation using acetyl sulfate aiming to obtain chemically and thermally stable polymeric materials employed as membranes. The commercial PEI was chemically modified by homogenous sulfonation reaction, which was conducted with acetyl sulfate prepared by mixing acetic anhydride and sulfuric acid, using N-methyl-2-pyrrolidone (NMP) as polymer solvent. The sulfonated PEI (PEI-SO3H) films with sulfonation range around 0.02-0.8% were obtained and characterized by Fourier transform infrared spectroscopy, ion exchange capacity, water sorption and glass transition temperature. The PEI-SO3H films with different sulfonation level were more thermally stable (Tg=200145 degrees C) than commercial membranes, Nafion (TM) 117 (Tg= 110 degrees C). Dense membrane was prepared with good mechanical properties and showed to be swollen by water. PEI-SO3H films show that the increase of the sulfonation level led to higher values of water sorption and the IEC properties. (c) 2006 Elsevier B.V. All rights reserved. 
poly(ether imide); sulfonation reaction; acetyl sulfate