Characterization of surface accumulation and release of nanosilica during irradiation of polymer nanocomposites by ultraviolet light
| Autor: | Savelas A. Rabb, Bastien T. Pellegrin, Xiaohong Gu, Justin M. Gorham, Joannie W. Chin, Lee L. Yu, Tinh Nguyen, Coralie Bernard, Stuztman P |
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| Rok vydání: | 2012 |
| Předmět: |
chemistry.chemical_classification
Materials science Nanocomposite Polymer nanocomposite Composite number Biomedical Engineering Nanoparticle Bioengineering General Chemistry Polymer Epoxy Condensed Matter Physics chemistry visual_art Ultraviolet light visual_art.visual_art_medium General Materials Science Composite material Photodegradation |
| Zdroj: | Journal of nanoscience and nanotechnology. 12(8) |
| ISSN: | 1533-4880 |
| Popis: | Polymer nanocomposites are increasingly used in applications that are subjected to harsh environments. Owing to polymer's susceptibility to photodegradation, nanofillers in a polymer nanocomposite may be released into the environments during the composite's life cycle. Such release potentially poses an environmental health and safety problem and may hinder commercialization of these advanced materials. This study investigated the fate and release of nanosilica from epoxy/nanosilica composites. Specially-designed holders containing nanocomposite specimens were irradiated with UV light in a well-controlled environmental chamber. UV irradiated samples were removed for measurements of polymer chemical degradation, mass loss, surface morphology, nanosilica accumulation on the composite surface, and nanosilica release. Epoxy matrix underwent rapid photodegradation, resulting in substantial accumulation of silica nanofillers on the composite surface and also release from the composite. A conceptual model for surface accumulation and release of nanosilica during UV irradiation of epoxy nanocomposites is presented. |
| Databáze: | OpenAIRE |
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