Flammability Properties of Polymer−Layered-Silicate Nanocomposites. Polypropylene and Polystyrene Nanocomposites

Abstract

Our continuing study of the mechanism of flammability reduction of polymer−layered-silicate nanocomposites has yielded results for polypropylene-graft-maleic anhydride and polystyrene−layered-silicate nanocomposites using montmorillonite and fluorohectorite. Cone calorimetry was used to measure the heat release rate and other flammability properties of the nanocomposites, under well-controlled combustion conditions. Both the polymer−layered-silicate nanocomposites and the combustion residues were studied by transmission electron microscopy and X-ray diffraction. We have found evidence for a common mechanism of flammability reduction. We also found that the type of layered silicate, nanodispersion, and processing degradation have an influence on the flammability reduction.

Benzimidazolium surfactants for modification of clays for use with styrenic polymers

“…It is usually felt that the change in the peak heat release rate occurs due to a change in the mass loss rate and there is a comparable reduction in both with both surfactants and all three polymers. The two clays give similar results and are comparable to literature data for PS, ABS and HIPS [25], [29], [30] and [31]. Also the TGA behavior is comparable to nanocomposites of crystallizable syndiotactic-PS with alkyl-imidazolium modified montmorillonites [24].…”

Comparative study on the flammability of polyethylene modified with commercial fire retardants and a zinc aluminum oleate layered double hydroxide

“…For MMT/modified polymer nanocomposites, the reduction in PHRR has been explained by a chemical and physical action of the inorganic layers dispersed in the polymer matrix [8] and [27].…”

Investigação da influência do processamento na dinâmica molecular de nanocompósitos de policarbonato e argila organofílica obtidos via intercalação por fusão

“…A desordem causada na organização cristalina da argila, devido à entrada das cadeias poliméricas em sua estrutura, aumenta ainda mais este espaçamento, podendo levar à esfoliação das lamelas (Figura 3) [1,2] . organofílica advêm da íntima interface polímero-carga proporcionada pela forte interação em escala nanométrica [8,[13][14][15][16][17] . O emprego de quantidades reduzidas dessas nanocargas sugere preservação das propriedades da matriz polimérica aliada ao ganho em certas características do nanomaterial sobre o polímero puro.…”