Synergy between nanocomposite formation and low levels of bromine on fire retard

2019-10-02 07:59:39

heat analysis prepared release nanocomposites

责任者: Chigwada, Grace;Jash, Panchatapa;Jiang, David D.;Wilkie, Charles A. 单位: Department of Chemistry, Marquette University, Milwaukee, WI 53201, United States 来源出处: Polymer Degradation and Stability,2005,88(3):382-393 摘要: An organically-modified clay has been prepared using ammonium salts which contain an oligomeric material consisting of vinylbenzyl chloride, styrene and dibromostyrene. The presence of dibromostyrene enhances the flame retardancy of polystyrene nanocomposites compared to both the virgin polymer and polystyrene nanocomposites prepared from non-halogen-containing organically-modified clays. The nanocomposites were prepared both by bulk polymerization and melt blending and they were evaluated by X-ray diffraction, transmission electron microscopy, thermogravimetric analysis and cone calorimetry measurements. Bulk polymerization produced nanocomposites with reduced peak heat release rate, reduced total heat release and improved thermal stability. It is noteworthy that all these improvements were obtained with clay loading as low as 3% and bromine content less than 4%. © 2005 Elsevier Ltd. All rights reserved. 关键词: Polystyrenes;Flame retardants;Nanostructured materials;Composite materials;Oligomers;Thermodynamic stability;Ignition;Clay;Thermogravimetric analysis;Transmission electron microscopy;X ray diffraction;Peak heat release rate (PHRR);Ignition time;Exfoliation;Halogenated compounds