Thermal degradation of commercially available organoclays studied by TGA–FTIR

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• 作者：José ; M. Cervantes-Uc ; Juan V. Cauich-Rodr&#xed ; guez ; Humberto Vá ; zquez-Torres ; Luis F. Garfias-Mes&#xed ; as ; Donald R. Paul
• 关键词：Thermal degradation ; Organoclay ; Thermal decomposition ; Cloisite™
• 刊名：Thermochimica Acta
• 出版年：2007
• 期刊代码：110_00406031
• 类别：ch
• 出版时间：15 June 2007
• 卷：457
• 期：1-2
• 页码：92-102
• 文件大小：1598 K

摘要

Thermogravimetry coupled to Fourier transform infrared spectroscopy (TGA/FTIR) has been used to study the thermal decomposition products evolved during the degradation of several commercially available organoclays (Cloisites™ Na⁺, 10A, 15A, 20A, 25A, 93A and 30B). It was found that the decomposition pattern of the organoclays was different for each sample: Cloisite™ 10A shows three well-defined degradation stages, Cloisite™ 30B only two stages and the Cloisite™ 93A only one weight loss; Cloisites™ 15A, 20A and 25A exhibited a more complex behavior showing one main stage and a shoulder. It was also observed that the onset of the decomposition was different for each type of organoclay, being Cloisite™ 10A the lowest (160 °C) and Cloisite™ 93A the highest (212 °C). FTIR analysis of the evolved products from their non-oxidative thermal degradation showed the release of water, aldehydes, carboxylic acids, aliphatic compounds and, in some cases, aromatic compounds and CO₂. It is suggested that the degradation of both tallow residue and unexchanged surfactant explain the presence of some products evolved during degradation of organoclays.