Polypropylene/clay nanocomposites: Effect of different clays and compatibilizers on their morphology

被引：0
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作者：
Palza, Humberto [1 ,2 ]
Vergara, Rodrigo [2 ]
Yazdani-Pedram, Mehrdad [2 ,3 ]
Quijada, Raúl [1 ,2 ]
机构：
[1] Departamento de Ingeniería Química y Bioiecnología, Facultad de Ciencias Físicas y Matemáticas, Universidad de Chile, Beauchef 861, Santiago, Chile
[2] Centro para la Invest. Interdisciplinaria Avanzada en Cie. de los Mat. (CIMAT), Universidad de Chile, Av. Blanco Encalada 2008, Santiago, Chile
[3] Departamento de Química Orgánica y Fisicoquímica, Facultad de Ciencias Químicas y Farmacéuticas, Universidad de Chile, Olivos 1007, Santiago, Chile
来源：
Journal of Applied Polymer Science | 2009年 / 112卷 / 03期
关键词：
A set of organically modified clays (OLS) were mixed with different compatibilizers to alter their interactions with either homopolymer or heterophasic polypropylenes when they were melt-mixed; and the relation between the OLS/compatibilizer system and the composite morphology was studied. X-ray diffraction (XRD) showed that depending on the specific OLS/compatibilizer system; it is possible to obtain several morphologies in the composites. In particular; some samples prepared with compatibilizers based on itaconic acid and OLSs; which had the highest cation exchange capacity and were organically modified with a set of quaternary ammonium salts; presented longer clay interlayer distances than the original OLSs; whereas other composites showed a clay collapse associated with shorter interlayer distances. Moreover; some composites presented both kinds of morphologies together. By means of diffuse reflectance spectroscopy and thermogravimetric analysis; it was possible to show that the OLSs were stable under the operating conditions; so the decrease in the interlayer distance found in some samples was not related to degradation processes. On the other hand; high-resolution transmission electron microscopy (HR-TEM) showed that collapsed clays were formed by tac-toid and immiscible structures with poor dispersion in the polymer matrix. However; samples with intercalate state from XRD presented very well dispersed multilayer stacks about 10 nm thick. Finally; those samples with both collapsed and intercalate morphologies presented tactoid and immiscible structures together with well dispersed multilayer stacks in the corresponding HR-TEM images. © 2009 Wiley Periodicals; Inc;
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页码：1278 / 1286
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