期刊
JOURNAL OF MEMBRANE SCIENCE
卷 337, 期 1-2, 页码 208-214出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.memsci.2009.03.045
关键词
Thermoplastic polyurethane; Polymer/clay nanocomposites; Barrier membranes; Gas permeation
资金
- National Science Foundation [CMMl 0600090]
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. (C) 2009 Elsevier B.V. All rights reserved.
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