Alkyl ammonium intercalation of Mozambican bentonite

被引：29

作者：

Massinga, Pedro H., Jr. ^{[1
,2
]}

Focke, Walter W. ^{[1
]}

de Vaal, Phillip L. ^{[1
]}

Atanasova, Maria ^{[1
,3
]}

机构：

[1] Univ Pretoria, Inst Appl Mat, Dept Chem Engn, ZA-0002 Pretoria, South Africa

[2] Univ Eduardo Mondlane, Fac Nat Sci, Dept Chem, Maputo, Mozambique

[3] Council Geosci, ZA-0001 Pretoria, South Africa

来源：

APPLIED CLAY SCIENCE | 2010年 / 49卷 / 03期

基金：

新加坡国家研究基金会;

关键词：

Intercalation; Bentonite; Quaternary ammonium salt; Organo-bentonite; ALKYLAMMONIUM LAYER-SILICATES; PARAFFIN-LIKE STRUCTURES; PHOSPHONIUM-MONTMORILLONITE; CATIONIC SURFACTANT; PHYSICAL-PROPERTIES; CLAY-MINERALS; X-RAY; NANOCOMPOSITES; ADSORPTION; EXFOLIATION;

D O I：

10.1016/j.clay.2010.04.017

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：

Organo-bentonites containing quaternary ammonium surfactants were prepared using purified bentonite from the Boane deposit in Mozambique. The intercalation was effected by intimate mixing of the surfactants into a concentrated dispersion of soda ash activated bentonite. TG indicated organic contents that exceeded CEC expectations by up to 21 mass %. XRD results were consistent with: (i) paraffin-type extended chain intercalation at tilt angles of 27 degrees to 33 degrees; and (ii) interdigitated monolayer intercalation of the C14 single alkyl chain surfactant and bilayer intercalation of the C16 double alkyl chains and its 1:1 mixture with the single chain surfactant. However, FTIR analysis revealed disordered alkyl chain conformations. White oil dispersions containing 10 mass % organo-bentonite (inorganic basis) featured high viscosities. They showed strong shear thinning behaviour confirming the ability of the montmorillonite particles to exfoliate. (C) 2010 Elsevier B.V. All rights reserved.

引用

页码：142 / 148

页数：7

共 45 条

[1] Fabrication and physical properties of EPDM-organoclay nanocomposites [J].

Ahmadi, SJ ;

Huang, YD ;

Li, W .

COMPOSITES SCIENCE AND TECHNOLOGY, 2005, 65 (7-8) :1069-1076

[2] Polymer-layered silicate nanocomposites: Preparation, properties and uses of a new class of materials [J].

Alexandre, Michael ;

Dubois, Philippe .

Materials Science and Engineering: R: Reports, 2000, 28 (1-2) :1-63

[3]

Brown G., 1980, CRYST STRUCT COMMUN, P305, DOI DOI 10.1180/MONO-5.5

[4] Thermally stable phosphonium-montmorillonite organoclays [J].

Calderon, Jorge Uribe ;

Lennox, Bruce ;

Kamal, Musa R. .

APPLIED CLAY SCIENCE, 2008, 40 (1-4) :90-98

[5] Thermal transitions and barrier properties of olefinic nanocomposites [J].

Chaiko, DJ ;

Leyva, AA .

CHEMISTRY OF MATERIALS, 2005, 17 (01) :13-19

[6] Organoclays: Properties, preparation and applications [J].

de Paiva, Lucilene Betega ;

Morales, Ana Rita ;

Valenzuela Diaz, Francisco R. .

APPLIED CLAY SCIENCE, 2008, 42 (1-2) :8-24

[7] Polymer nanocomposites: from fundamental research to specific applications [J].

Fischer, H .

MATERIALS SCIENCE & ENGINEERING C-BIOMIMETIC AND SUPRAMOLECULAR SYSTEMS, 2003, 23 (6-8) :763-772

[8] Influence of clay exfoliation on the physical properties of montmorillonite/polyethylene composites [J].

Gopakumar, TG ;

Lee, JA ;

Kontopoulou, M ;

Parent, JS .

POLYMER, 2002, 43 (20) :5483-5491

[9]

Greene-Kelly R., 1955, Mineral Mag, V228

[10] X-RAY-DIFFRACTION AND ELECTRON-OPTICAL STUDIES ON SMECTITE AND ALPHA-CRYSTOBALITE ASSOCIATIONS [J].

GUVEN, N ;

GRIM, RE .

CLAYS AND CLAY MINERALS, 1972, 20 (02) :89-&

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