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

详细信息	查看全文 | 推荐本文 |

• 作者：Luca Zampori^a ; ^{luca.zampori@chem.polimi.it} ; Giovanni Dotelli^a ; Paola Gallo Stampino^a ; Cinzia Cristiani^a ; Federico Zorzi^b ; Elisabetta Finocchio^c
• 关键词：In situ HT-XRD ; FT IR spectroscopy ; PEG ; Montmorillonite ; Interstratification
• 刊名：Applied Clay Science
• 出版年：2012
• 期刊代码：5_01691317
• 类别：ms
• 出版时间：May, 2012
• 卷：59-60
• 期：Complete
• 页码：140-147
• 文件大小：767 K

摘要

Two polyethylene-glycols (PEG), having different molecular weight (i.e. 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 掳C and 25-850 掳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 掳C, independently from the molecular weight of the PEG intercalated. This phase showed to be stable when the temperature was decreased to 25 掳C and was raised again to 250 掳C. An irregularly interstratified phase was observed when the modified clay minerals were heated at 200 掳C.