Dipartimento di Ingegneria Chimica e di Processo G. B. Bonino, P. le Kennedy 1, Università di Genova, 16129 Genova, Italy.
J Phys Chem A. 2011 Jul 7;115(26):7484-93. doi: 10.1021/jp200845e. Epub 2011 Jun 15.
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.
通过 XRD、TG 和 IR 光谱研究了有机聚合物分子（即 PEG 和 BRIJ）在标准 Ca-蒙脱石中的插层情况。XRD 光谱中 d(001)的增加以及有机粘土材料复杂的多步热分解行为证实了聚合物的插层。插层材料的中红外和漫反射近红外光谱显示出聚合物的特征谱带（CH 伸缩和变形模式），这些谱带通过与粘土基质的相互作用而发生位移或形状改变。基于 PEG 1500 和 PEG 4000 的材料可能以伸展构型插层，类似于无定形聚合物形式。BRIJ 插层聚合物的光谱表明，烷基链在占主导地位的“gauche”、无序堆积的构象中呈现无序构象。主体蒙脱石的 IR 带，主要是 OH 和水伸缩和变形的基频、组合和倍频带，由于聚合物的插层而强度降低，表明存在相互作用，可能通过氢键和/或可能取代阳离子水合水分子。
