期刊
APPLIED CLAY SCIENCE
卷 54, 期 3-4, 页码 226-234出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.clay.2011.09.006
关键词
Synthetic fluoromicas; Organophilic micas; Somasif clays; Thermal stability; SAXS
资金
- CNPq
- CAPES
- FAPERJ
The morphology and thermal stability of a completely inorganic synthetic fluoromica (Somasif ME-100) and four organophilic fluoromicas were investigated comparatively by using different techniques as FTIR, XRD, SAXS, GPC, SEM and TGA. These organophilic micas which were intercalated with oligoether-based (Somasif MEE and MPE) and alkyl-based (Somasif MAE and MTE) ammonium salts present, as typical morphology, families of mica domains with lateral dimension up to 4 mu m, formed by the association of nanosized mica aggregates having different distances between platelets. Somasif micas containing alkyl-based ammonium salt presented the higher proportion of lamellae not successfully organically modified, whereas the modified fluoromicas containing oligoether-modifiers showed the highest volume fraction of aggregates with higher interlayer distances d (up to 6.1 nm). All organophilic fluoromicas have thermal degradation from 200 to 460 degrees C and Somasif MPE with PPG moieties has the best thermal stability among the organomicas. (C) 2011 Elsevier B.V. All rights reserved.
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