Emulsion polymerization fire retardants

Styryltropylium (a carbo-cation) was used to modify clay for producing PS nanocomposites by in situ emulsion polymerization (Table 3.4) [60]. The resulting nanocomposites exhibited a mixture of intercalated and exfoliated structures. The nanocomposites exhibited improved thermal stability and fire retardancy. Halloysite nanotubes (HNT) are a kind of aluminosilicate clay with a hollow nanotubular structure (about 20-50 nm in diameter and several hundred nanometers in length) [61]. HNT was modified with y-methacryloxypropyltrimethoxysilane to produce a nanoclay (Table 3.4). HNT/PS nanocomposites were prepared by in situ bulk polymerization. The thermal stability of the HNT/PS nanocomposites was better than that of the pure polystyrene. 

Evaluation of the composite materials in terms of limited oxygen index (LOI) provides first-hand information on the effectiveness of fire-retardant additives. Zhang et reported on the fire-retardant properties of exfoliated PS-LDH nanocomposites prepared by emulsion polymerization. For comparison, conventional PS-LDH nanocomposites have also been prepared by melt mixing PS with LDH nanoparticles with a diameter of 10-40 nm. Figure 2.14 shows the... 

Biodegradable Polymer-Clay Nanocomposite Fire Retardants via Emulsifier-free Emulsion Polymerization... 

The present review of nanocomposites synthesized by in situ polymerization highlights an increasing number of studies on emulsifier-free emulsion polymerization. In our laboratory, using the in situ emulsifier-free emulsion technique, we have prepared a number of polymer nanoparticles and nanocomposites, such as PMMA and PAN nanoparticles, PEHA-SS nanocomposite used for biodegradable superabsorbents, pressure-sensitive adhesives (PSAs), PMMA-MMT, PBA SS, PBMA SS-Mg(OH)2 nanocomposites used for fire retardants, PAN SS used as a water absorbent, poly(EHA-co-AA)-SS nanocomposite to act as a PSA in transdermal drug delivery (TDD) and poly(AA-co-AM)-MBA nanohydrogel for colon-specific drug delivery. ... 

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