Synthesis and characterization of polystyrene - layered double hydroxide nanocomposites via in situ polymerization / Sintese e caracterização de nanocompositos de poliestireno - hidroxido duplo lamelar via polimerização in situ

AUTOR(ES)
DATA DE PUBLICAÇÃO

2010

RESUMO

Over the past decade, polymer nanocomposites have attracted considerable interests in both academia and industry. This fact has connection with notable improvement in several properties these new materials have demonstrated with a small amount of nano-reinforcements. Some superior properties of polymer nanocomposites include barrier resistance and flame retardancy. The aim of this work was to synthesize two kinds of layered double hydroxide (LDH) modified with sodium dodecyl sulfate (SDS). Both layered double hydroxides (LDHs) were incorporated into styrene by bulk free radical polymerization in order to produce the nanocomposites polystyrene - layered double hydroxide - sodium dodecyl sulfate (PS - LDH/SDS). The layered double hydroxides modified with sodium dodecyl sulfate (LDH/SDS) were prepared by co-precipitation method and the nanocomposites have been synthesized by bulk free radical polymerization. These layered double hydroxides modified with sodium dodecyl sulfate were characterized by Foster swelling, X - rays diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR) and the nanocomposites were characterized by X -rays diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), transmission electron microscopy (TEM), thermogravimetric analysis (TGA) and flammability test. These new materials formed in this work showed great interaction polymer -layered double hydroxide (exfoliation) as well as excellent improvements on their properties when compared with pure polymer. The property flame retardancy showed improvements in the two nanocomposites synthesized and in all ratios studied, this behavior induces application of these new materials in many fields of engineering

ASSUNTO(S)

in situ polymerization hydroxides nanocomposite polimerização in situ hidroxidos polystyrene nanocompositos poliestireno

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