Thermal characterization of a montmorillonite, modified with polyethylene-glycols (PEG1500 and PEG4000), by in situ HT-XRD and FT IR: Formation of a high-temperature phase

被引：28
作者：
Zampori, Luca [1 ]
Dotelli, Giovanni [1 ]
Stampino, Paola Gallo [1 ]
Cristiani, Cinzia [1 ]
Zorzi, Federico [2 ]
Finocchio, Elisabetta [3 ]
机构：
[1] Politecn Milan, Dipartimento Chim Mat & Ingn Chim G Natta INSTM R, I-20133 Milan, Italy
[2] Univ Padua, Dipartimento Geosci, I-35137 Padua, Italy
[3] Univ Genoa, Dipartimento Ingn Chim & Proc GB Bonino, I-16129 Genoa, Italy
来源：
APPLIED CLAY SCIENCE | 2012年 / 59-60卷
关键词：
In situ HT-XRD; FT IR spectroscopy; PEG; Montmorillonite; Interstratification; CLAY;
D O I：
10.1016/j.clay.2012.02.015
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Two polyethylene-glycols (PEG), having different molecular weight (Le. PEG 1500 and PEG 4000) were intercalated inside the interlayer space of a STx montmorillonite. The microstructure of the intercalated clay mineral was investigated by thermogravimetry (TG) and in situ high temperature-XRD, in order to assess the evolution of the interlayer space upon temperature. Data were collected over a temperature range of 25-1000 degrees C and 25-850 degrees C for TG and thermo-XRD, respectively. Decomposition of the intercalated polymers was very different compared to the one of the pure surfactants, as detected by TG and FT IR spectroscopy. In situ high temperature-XRD data showed the formation of a high-temperature phase, detected at 250 degrees C, independently from the molecular weight of the PEG intercalated. This phase showed to be stable when the temperature was decreased to 25 degrees C and was raised again to 250 degrees C. An irregularly interstratified phase was observed when the modified clay minerals were heated at 200 degrees C. (C) 2012 Elsevier B.V. All rights reserved.
引用
收藏
页码：140 / 147
页数：8
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