کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1695364 1011856 2011 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Nanostructure and dynamic mechanical properties of silane-functionalized montmorillonite/epoxy nanocomposites
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات ژئوشیمی و پترولوژی
پیش نمایش صفحه اول مقاله
Nanostructure and dynamic mechanical properties of silane-functionalized montmorillonite/epoxy nanocomposites
چکیده انگلیسی

In this work sodium montmorillonite (Na-MMT) was functionalized with N-(2-aminoethyl)-3-aminopropyl-trimethoxysilane and the corresponding silylated clay was used to modify epoxy matrix cured with triethylenetetramine. The grafting/intercalation of the aminosilane inside the clay galleries were followed by infrared spectroscopy, X-ray diffraction, thermogravimetric analysis and 29Si cross-polarization magic-angle-spinning nuclear magnetic-resonance (CP/MAS NMR) spectroscopy. Epoxy-based nanocomposites were prepared with different amounts of silylated clay or commercial organoclay, Cloisite 30B, whose intercalating agent consists of a methyl, tallow, bis-2-hydroxyethyl quaternary ammonium salt. The degree of intercalation/exfoliation was estimated by X-ray diffraction experiments and confirmed by small angle X-ray scattering. Nanocomposites prepared with silylated clay displayed no peak in both XRD and SAXS curves whereas those prepared with Cloisite 30B exhibited a clear interference peak corresponding to an interlayer spacing d001 of 4.1 nm. The former also presented a better dispersion, with a high proportion of tactoids smaller than 2 nm, as estimated by SAXS. From the results of dynamic mechanical analysis it was observed that most of the nanocomposites display higher storage modulus mainly at temperatures above the glass transition temperature. The glass transition temperature is similar or higher than the neat epoxy network for nanocomposites containing 1 wt.% of silylated clay or higher.

Figure optionsDownload as PowerPoint slideHighlights
► Sodium MMT functionalized with N-(2-aminoethyl)-3-aminopropyltrimethoxysilane.
► Preparation of epoxy-based nanocomposites with silylated clay.
► High exfoliation degree was observed from XRD and SAXS measurements.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Clay Science - Volume 54, Issue 2, November 2011, Pages 151–158
نویسندگان
, , ,