کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
637144 | 1456141 | 2009 | 7 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Transport properties in polyurethane/clay nanocomposites as barrier materials: Effect of processing conditions Transport properties in polyurethane/clay nanocomposites as barrier materials: Effect of processing conditions](/preview/png/637144.png)
Polyurethane/clay nanocomposites were fabricated in solution and tested as gas barrier membranes. Natural montmorillonite was modified with various alkylammonium surfactants and incorporated into a polyurethane matrix. Permeation properties of the nanocomposites were studied as a function of processing methodology. Pre-processing clay samples with sonication instead of plain stirring led to significantly better barrier properties, suggesting that dispersion of the clay particles is a critical factor. Fitting the experimental permeabilities with phenomenological models, which predict the effective permeability of polymer systems filled with barrier flakes as a function of flake concentration, led to unrealistically low values of calculated aspect ratios of the clay layers.
Journal: Journal of Membrane Science - Volume 337, Issues 1–2, 15 July 2009, Pages 208–214