Multi-method analysis of multiwall carbon nanotube polymer nanocomposite samples after photodegradation

摘要

Nanomaterials can be used as nanofillers to enhance the properties of polymeric materials. However, the effect of weathering on nanocomposites and the potential for nanomaterial release is not yet well understood. Multiple analytical methods are needed to address these issues. Multiwall carbon nanotube (MWCNT) epoxy nanocomposite materials at two concentrations (3.5% and 0.72%) were exposed to carefully controlled ultraviolet (UV) doses (equivalent of up to ≈ 4 years in Florida). These samples were analyzed with a suite of optimized gravimetric, spectroscopic, and microscopic techniques. The presence of MWCNTs at both loadings retarded the photodegradation of the nanocomposite samples, and multiple techniques showed the accumulation of MWCNTs on the sample surface. The analytical methods developed in this study provide important information on the life-cycle impacts of polymer nanocomposites.