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Effects of the addition of LiCl, LiClO 4 , and LiCF 3 SO 3 salts on the chemical structure, density, electrical, and mechanical properties of rigid polyurethane foam composite
Author(s) -
Verdolotti L.,
Colini S.,
Porta G.,
Iannace S.
Publication year - 2011
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.21846
Subject(s) - lithium (medication) , trifluoromethanesulfonate , lithium perchlorate , materials science , composite number , ion , electrical resistivity and conductivity , inorganic chemistry , composite material , polymer chemistry , chemistry , organic chemistry , electrolyte , medicine , electrode , engineering , endocrinology , catalysis , electrical engineering
Abstract The effect of the incorporation of several lithium salts on the electrical and mechanical properties of polyurethane rigid (PUR) foams was investigated. Different amounts of lithium chloride (LiCl), lithium perchlorate (LiClO 4 ), and lithium trifluoromethanesulfonate (LiCF 3 SO 3 ) were added to the polyuretanic precursor. The salts affected the cellular microstructures and consequently the mechanical properties of the composite. Composite foams containing an amount of LiCl greater than 2 wt% showed low‐surface resistivity (∼10 6 Ω), whereas the LiClO 4 and LiCF 3 SO 3 composites showed, in all range of filler percentage analyzed, high‐surface resistivity values (∼10 11 Ω). This behavior was related to the different interactions between PUR and lithium salts, as confirmed by FTIR/Attenuated Total Reflectance analysis. Only the LiCl was able to create a motion of the ions Li + and Cl − along the polyurethanic chains, because LiCl was completely dissociated. On the contrary, LiClO 4 and LiCF 3 SO 3 that affected the macromolecular structure of the polymeric network did not permit the formation of polyurethanic channels, where the ions could move, thus creating a charge motion. POLYM. ENG. SCI., 2011. © 2011 Society of Plastics Engineers