Polymer nanocomposites (PNCs), in which nanofillers are added into a polymer matrix, can be engineered for improved barrier properties, increased mechanical strength or as anti-microbial materials. To assist in the responsible development of nanotechnology-enable products, additional information on the potential for nanoparticles (NPs) to migrate into food or the environment under intended use conditions, is being developed. Previous studies on NP exposure have used PNCs incorporating polydisperse NPs and poorly-defined polymer matrices, making it difficult to formulate broad predictive exposure models. Our model system incorporates high-quality NPs into polymers with well-understood properties, which facilitates targeted study of specific parameters, including particle size, stability, and composition, and their impact on release phenomena. Here, several sizes of Ag NPs were synthesized and mixed into low density poly(ethylene) (LDPE) to create polymer nanocomposite films with well-controlled characteristics. Ag NPs were chosen as a model particle because synthetic routes to monodisperse, good-quality organic-soluble particles are well-understood, and AgNPs have been presented as a potential future additive to polymer-based products due to their antimicrobial properties. The release of Ag NPs or their components into model food contact substances, such as water and 3% acetic acid (pH=2.5, vinegar strength), was tested and quantified by ICP-MS, electron microscopy, and optical measurements. This work is an example of a well-controlled lifecycle analysis when it comes to PNCs in consumer products.

Ag/LDPE nanocomposites as a model system to evaluate release from consumer products

256th National Meeting (2018)

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