Abstract
AbstractMono‐ and bi‐functional guest molecules, poly(ethylene glycol)‐n‐alkyl‐3‐sulfopropyl diether (PEG‐AS) and poly(ethylene glycol)dicarboxylic acid (PEG‐DC), containing hydrophilic polyoxyethylene (PEO) chains of different ethylene oxide units (EOUs) are incorporated between the layers of Cu2Cr(OH)6Cl·nH2O hydrotalcite‐type materials. The intercalation compounds are characterized by chemical analysis, adsorption measurements, XRD, SEM, FTIR and 13C CP‐MAS spectroscopy. It is found that the polyoxyethylene chain of PEG‐DC distorts its helical symmetry when it is intercalated in the LDH galleries. The basal spacing of PEG‐AS nanocomposites is independent of the number, n, of EOUs in the polymer chain. In addition to changes in the IR bands, 13C CP‐MAS spectra are modified with new resonance peaks at more deshielded values. These facts suggest a strong interaction of polyether chains with the LDH inner‐surface, with the hydrophobic alkyl tail dangling into the interlamellar space. It is shown that the terminal functionalities dictate the arrangement of the PEO chains. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2003)
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