title: Hybrid organo-inorganic clay with nonionic interlayers. mid- and near-IR spectroscopic studies.
abstract: The intercalation of organic polymers molecules (i.e., PEGs and BRIJ) into a standard Ca-montmorillonite has been studied by XRD, TG, and IR spectroscopy. The polymer intercalation is confirmed by the increasing of the d(001) in XRD spectra as well as by the complex multisteps thermal decomposition behavior of the organo-clay materials. Mid-IR and diffuse reflectance near-IR spectra of the intercalated materials show the polymer diagnostic bands (CH stretching and deformation mode), shifted or changed in shape by the interaction with the clay matrix. Both PEG 1500 and PEG 4000 based materials are likely intercalated in an extended configuration, similar to the amorphous polymer form. BRIJ intercalated polymer spectra suggest the disordered conformation of the alkilic chain in a prevailing "gauche", poorly packed, conformation. Host montmorillonite IR bands, mainly OH and water stretching and deformation fundamentals, combination, and overtone bands, are reduced in intensity by polymer intercalation, pointing out an interaction, likely through H-bonding and/or a possible substitution of cations hydration water molecules.
authors.affiliation: Dipartimento di Ingegneria Chimica e di Processo G. B. Bonino, P. le Kennedy 1, Università di Genova, 16129 Genova, Italy. Elisabetta.Finocchio@unige.it
authors.forename: Elisabetta
authors.initials: E
authors.lastname: Finocchio
authors.forename: Irene
authors.initials: I
authors.lastname: Baccini
authors.forename: Cinzia
authors.initials: C
authors.lastname: Cristiani
authors.forename: Giovanni
authors.initials: G
authors.lastname: Dotelli
authors.forename: Paola
authors.initials: P
authors.lastname: Gallo Stampino
authors.forename: Luca
authors.initials: L
authors.lastname: Zampori
mesh_terms: D000538:Aluminum Silicates; D000077215:Clay; D013055:Spectrophotometry, Infrared / Q000379:methods*; D013818:Thermogravimetry; D014961:X-Ray Diffraction
chemical_list: D000538:Aluminum Silicates; D000077215:Clay