TG characterization of organically modified montmorillonite

被引：31
|
作者：
Soares, VLP [1 ]
Nascimento, RSV [1 ]
Menezes, VJ [1 ]
Batista, L [1 ]
机构：
[1] Univ Fed Rio de Janeiro, Dept Quim Organ, Inst Quim, BR-21949590 Fundao, Brazil
来源：
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY | 2004年 / 75卷 / 02期
关键词：
ammonium salt; montmorillonite; thermogravimetric analysis;
D O I：
10.1023/B:JTAN.0000027161.10803.60
中图分类号：
O414.1 [热力学];
学科分类号：
摘要：
Montmorillonite was modified with octadecyltrimethylammonium chloride, Under different reaction conditions, as evidenced by TG and XRD. TG curves presented two degradation peaks (295 and 395degreesC). At low salt concentrations, only the 395degreesC-degradation appeared, which increased with reaction time to the limit of 9 g of salt/100 g of clay. The second peak presented a limit at 17/100 m/m of salt/clay ratio. XRD analysis confirmed clay organic modification as the basal distance increased, showing greater reaction time effect than the salt mass effect, and with only one d-spacing. This suggested that an intercalation complex was formed but also that octadecyltrimethylammonium was adsorbed on the external surfaces of clay particles.
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页码：671 / 676
页数：6
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