Synthesis and thermal properties of nanocomposites based on exfoliated organoclay polystyrene and poly(methylmethacrylate)

Abstract

Exfoliated organoclay-polystyrene (OC-PS) and organoclay-poly(methyl methacrylate) (OC-PMMA) nanocomposites were prepared using novel modified/ clay-polymer through both bulk polymerization and solution techniques. The synthesis was achieved by formation of derivative vinylbenzyl ammonium salt intercalated with montmorillonite (MMT) clay. The clay-vinyl/monomer was dispersed in PS or MMA monomers followed by solution polymerization. The clay-PS and clay-PMMA were used as highly compatibilizer organoclay to produce highly exfoliated nanocomposites. Morphological structure of the nanocomposites was investigated by SEM and XRD which confirmed that the clay is homogenously dispersed and exfoliated in the polymer matrixes with interlayer spacing at least of d001-value ≥4 nm for both PS and PMMA. Thermal properties of the nanocomposites show an increase in the decomposition temperature comparing to neat polymer.

Synergistic effects of thermoplastic and nanoclay on the performance properties and morphology of epoxy resin

“…It is shown that, the polymeric modifier provides a significant increase of thermal resistance through the insulating effect of the formed second phase. Other researchers have demonstrated that the thermal stability of intercalated samples was higher than that of the neat matrix, most probably due to the restriction of the motion of polymer chains attached to the nanoclay . Logically, the layered nanoclays present a kind of barrier for diffusion of volatile degradation products which may also act as catalyst during the dehydration process or epoxy chain scission .…”

“…Other researchers have demonstrated that the thermal stability of intercalated samples was higher than that of the neat matrix, most probably due to the restriction of the motion of polymer chains attached to the nanoclay [39,40]. Logically, the layered nanoclays present a kind of barrier for diffusion of volatile degradation products which may also act as catalyst during the dehydration process or epoxy chain scission [39]. Fractographic analysis has been often used as a tool to understand the dispersion quality of the nanoparticles in the cured epoxy systems as well as the toughening mechanisms of modified polymers.…”

Ordered polymer composite materials: challenges and opportunities

“…First, composite materials can be synthesized take advantage of the emergent properties that arise from ordered arrays of nanoparticles, such as electromagnetic coupling, controlled transport, or metamaterial behaviors. 11,116,144,155,[171][172][173][207][208][209][210][211][212][213][214][215] In these materials, the polymers primarily serve as fillers, spacers, and crosslinking agents to occupy the void space between NPs and hold the particle arrays in place. 112,137,146 However, more advanced materials can also be developed where the polymers serves to regulate the connectivity or coupling between particles as a means of modulating their collective behavior (e.g.…”

Effect of Organo Montmorillonite Nanoclay on Mechanical Properties Thermal Stability and Ablative Rate of Carbon fiber Polybenzoxazine Resin Composites

“…Type I composites with a nanoclay addition of up to 6% and type II composites with a nanoclay addition of up to 4% improved their thermal stability. Nanoclay provides a barrier to oxygen and matrix interactions, resulting in increased thermal stability [26][27] . T5 %/°C has decreased in relative to the blank at 6 wt% loading due to increased resin content in composites at higher loadings of nanoclay.…”