Transport properties in polyurethane/clay nanocomposites as barrier materials: Effect of processing conditions

被引：135

作者：

Herrera-Alonso, Jose M. ^{[1
]}

Marand, Eva ^{[1
]}

Little, John C. ^{[2
]}

Cox, Steven S. ^{[2
]}

机构：

[1] Virginia Polytech Inst & State Univ, Dept Chem Engn, Blacksburg, VA 24061 USA

[2] Virginia Polytech Inst & State Univ, Dept Civil & Environm Engn, Blacksburg, VA 24061 USA

来源：

JOURNAL OF MEMBRANE SCIENCE | 2009年 / 337卷 / 1-2期

基金：

美国国家科学基金会;

关键词：

Thermoplastic polyurethane; Polymer/clay nanocomposites; Barrier membranes; Gas permeation; POLYIMIDE CLAY HYBRID; SILICATE NANOCOMPOSITES; POLYMER NANOCOMPOSITES; MECHANICAL-PROPERTIES; ORGANOCLAY STRUCTURE; MORPHOLOGY; MEMBRANES; SEGMENT; COMPOSITES; COATINGS;

D O I：

10.1016/j.memsci.2009.03.045

中图分类号：

TQ [化学工业];

学科分类号：

081705 [工业催化];

摘要：

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.

引用

页码：208 / 214

页数：7

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