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Properties evaluation of the membranes synthesized with castor oil polyurethane and polyaniline
Author(s) -
Amado F.D.R.,
Rodrigues L.F.,
Forte M.M.C.,
Ferreira C.A.
Publication year - 2006
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.20602
Subject(s) - polyaniline , polyurethane , castor oil , materials science , membrane , chemical engineering , fourier transform infrared spectroscopy , ionomer , polymer chemistry , sulfonic acid , isocyanate , polymer , composite material , organic chemistry , chemistry , copolymer , polymerization , biochemistry , engineering
Polymeric membranes for electrodialysis, fuel cells, and other purposes with specific characteristics have been the focus of innumerable researches. The aim of this work was to evaluate membranes of the sulfonated polyaniline and polyurethane, obtained in the presence of the former, regarding its mechanical and electrical properties. Polyurethane (PU) was prepared from castor oil and 4–4‐diciclohexilmethane isocyanate (HMDI). Polyaniline was synthesized by chemical oxidation, as described in the literature, and was sulfonated with chlorosulfonic acid in dichloroethane. Solution membranes were prepared by mixing sulfonated polyaniline (SPAN) and polyaniline doped with p ‐toluene sulfonic acid (PAni TSA ) with castor oil and further HMDI. The obtained products were characterized by FTIR, TGA, and DMA. The membrane FTIR brought out the characteristic peaks of PU and polyanilines (TSA e sulfonated), and TGA curve showed a maximum decomposition rate at 350°C, quite different of the polyaniline ones. Nevertheless the SPAN/PU membrane showed very good stability until 250°C. The loss modulus curves show that there was an increase in the PU glass transition temperature with the addition of PAni and SPAN due to the their interaction with the PU chains. POLYM. ENG. SCI. 46:1485–1489, 2006. © 2006 Society of Plastics Engineers.