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Effect of the organic groups of difunctional silanes on the preparation of coated clays for olefin polymer modification

Published online by Cambridge University Press:  09 July 2018

F. E. Monasterio ,
M. L. Dias ,
V. J. R. R. Pita ,
E. Erdmann  and
H. A. Destéfanis
F. E. Monasterio*
Affiliation:
Instituto de Investigaciones para la Industria Química - INIQUI-CONICET, Consejo de Investigaciones - CIUNSa, Facultad de Ingeniería - UNSa, Buenos Aires 177-4400, Salta, Argentina
M. L. Dias
Affiliation:
Instituto de Macromoléculas Professora Eloisa Mano, Universidade Federal do Rio de Janeiro, IMA/UFRJ, C.P. 68525, 21945-970, Rio de Janeiro, Brazil
V. J. R. R. Pita
Affiliation:
Instituto de Macromoléculas Professora Eloisa Mano, Universidade Federal do Rio de Janeiro, IMA/UFRJ, C.P. 68525, 21945-970, Rio de Janeiro, Brazil
E. Erdmann
Affiliation:
Instituto de Investigaciones para la Industria Química - INIQUI-CONICET, Consejo de Investigaciones - CIUNSa, Facultad de Ingeniería - UNSa, Buenos Aires 177-4400, Salta, Argentina
H. A. Destéfanis
Affiliation:
Instituto de Investigaciones para la Industria Química - INIQUI-CONICET, Consejo de Investigaciones - CIUNSa, Facultad de Ingeniería - UNSa, Buenos Aires 177-4400, Salta, Argentina
*
*E-mail: [email protected]
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Abstract

Sodium montmorillonite (MMT) was organically modified with hexadecyltrimethyl-ammonium ions and subsequently treated with dichlorosilanes and water, aimed at in situ silane condensation polymerization and modification of clay platelets by polysiloxane coatings. Dimethyldichlorosilane, methylphenyldichlorosilane, and diphenyldichlorosilane were used to produce three siloxane-modified organoclays. The structure and morphology of the clay materials were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), thermal gravimetric studies (TG) and scanning electron microscopy (SEM). XRD results showed that the silanes were effectively polymerized in the clay galleries, forming a nanocomposite of intercalated particles. A fraction of the siloxane formed is bonded to the clay surface by covalent siloxane bonds. Strong structural differences in both morphology and thermal stability of the materials may occur when changing methyl or phenyl groups in the siloxane structure. The formation mechanism of these intercalated nanocomposite particles is considered. Finally, these modified clays were incorporated in an olefin polymer and morphological analyses using transmission electron microscope (TEM) images were carried out.

Keywords

oligo-siloxanesmontmorilloniteorganophilic clayhybridized clayHDPE/coated clay compositesclay/olefin compositesnanocomposites
Type
Research Article
Information
Clay Minerals , Volume 45 , Issue 4 , December 2010 , pp. 489 - 502
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2010

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