A Simple Method To Improve the Clarity and Rheological Properties of Polymer/Clay Nanocomposites by Using Fractionated Clay Particles
| Autor: | Srinivasa R. Raghavan, Bani H. Cipriano, Takashi Kashiwagi, Xin Zhang |
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| Rok vydání: | 2009 |
| Předmět: |
Materials science
Polymer nanocomposite Polymers engineering.material Nanocomposites Polymer clay chemistry.chemical_compound Microscopy Electron Transmission X-Ray Diffraction Organoclay General Materials Science Particle Size Composite material chemistry.chemical_classification Nanocomposite Water Polymer Montmorillonite chemistry Spectrophotometry Bentonite engineering Clay Aluminum Silicates Polystyrene Rheology Gels |
| Zdroj: | ACS Applied Materials & Interfaces. 1:130-135 |
| ISSN: | 1944-8252 1944-8244 |
| Popis: | We present a simple method to improve the transparency and rheological properties of polystyrene/organoclay nanocomposites. Such composites are typically prepared using organophilic derivatives of commercial montmorillonite (MMT) clays that contain a wide range of particle sizes. Our approach is to fractionate the native MMT clay to exclude large aggregates and then modify the fractionated clay (FMT) by a surfactant treatment (the resulting organoclay is termed o-FMT). Polystyrene nanocomposites made from the o-FMT are then compared with those made from a commercial organoclay having the same surfactant treatment. The o-FMT-based composites exhibit much better rheological properties (e.g., their elastic moduli at low frequencies are approximately 10 times higher) at equivalent mass loadings. Moreover, the o-FMT-based materials also have better transparency: e.g., a 10% o-FMT sample transmits as much light as a sample with 5% commercial clay. Transmission electron microscopy confirms that these differences in properties are related to microstructural differences; i.e., large aggregates are generally absent in the o-FMT samples. Clay fractionation may thus be a general strategy to enhance the properties of polymer/clay nanocomposites. |
| Databáze: | OpenAIRE |
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