Preparation of exfoliated clay/polymer nanocomposites via organosilane grafting and in situ ATRP of glycidyl methacrylate

作者：Djouani Fatma; Herbst Frederic; Chehimi Mohamed M^*; Benzarti Karim

来源：Surface and Interface Analysis, 2010, 42(6-7): 1019-1024.

DOI：10.1002/sia.3259

• clay
• polymer
• silane
• nanocomposite
• exfoliation
• nanofiller

Clay/polymer nanocomposites, of the type montmorillonite/poly(glycidyl methacrylate) (MMT/PGMA), were synthesized via atom transfer radical polymerization (ATRP). MMT was amino-silanized and then reacted with 2-bromoisobutyryl bromide (BIB) to provide -NH-C(=O)-C(CH(3))(2)Br groups attached to the clay. The latter (MMT-SiBr) served as macroinitiator for the in situ ATRP of GMA. The resulting MMT/PGMA nanocomposites were found to be highly exfoliated, as judged by X-ray diffraction (XRD) measurements. Thermogravimetric analysis (TGA) and XPS analyses suggest that the nanocomposites have PGMA-rich bulk and surface. Indeed, the mass loading of PGMA reached 65 wt. % while XPS spectra, particularly the high-resolution C1s region, resemble those of pure PGMA.
These clay/PGMA nanocomposites are suitable as nanofillers for epoxy adhesives, since PGMA chains are both compatible with epoxy resins and reactive towards crosslinkers via the pendant glycidyl groups from PGMA grafts.

• 出版日期2010-7