Preparation of Poly(methyl methacrylate)/Na-MMT Nanocomposites via in-Situ Polymerization with Macroazoinitiator

摘要

Poly(methyl methacrylate) (PMMA)/sodium montmorillonite (Na-MMT) nanocomposites were prepared with a novel method utilizing a macroazoinitiator (MAI).To induce the intergallery polymerization of methyl methacrylate (MMA),the MAI containing a poly(ethylene glycol) (PEG) segment was intercalated between the lamellae of Na-MMT and swelled with water to enhance the diffusion of MMA into the gallery.The structure of the nano-composite was examined using X-ray diffraction and transmission electron microscopy,and the thermal properties were examined using differential scanning calorimetry and thermogravimetry.The PMMA/Na-MMT nanocomposite prepared by intergallery polymerization showed a distinct enhancement of its thermal properties;an approximately 30 deg C increase in its glass transition temperature and an 80-100 deg C increase in its thermal decomposition temperature for a 10% weight loss.