Methods for Measuring Release of Material from MWCNT-Polymer Composites

D. Kaiser
National Institute of Standards and Technology, US

Keywords: CNT, nanoparticle release

Summary:

Multi-wall carbon nanotube (MWCNT)-polymer composites are currently used in myriad commercial products, with many more products under development. There is a potential for release of MWCNTs from both “feedstock” composites and manufactured products throughout all life cycle stages, and growing concern regarding exposure to and hazards of released MWCNTs to humans and the environment. The two release scenarios of primary interest are the application of mechanical forces (e.g., from sanding and drilling) and environmental effects (e.g., exposure to ultraviolet light and humidity). There are numerous measurement challenges in detecting, quantifying, and characterizing the two reported forms of released entities—fragments of MWCNT-polymer composites and unbound MWCNTs. An assessment of the measurement challenges and a review and analysis of each reported method for measuring released entities for both scenarios will be presented.