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Weathering Effects on Degradation of Low-Density Polyethylene-Nanosilica Composite with Added Pro-oxidant.
Journal of Polymers and the Environment 2023 April 29
Nanomaterials are increasingly used in polymer composites to enhance their properties, such as mechanical performance and durability, increased electrical conductivity, and improved optical clarity. Here results are presented of a study simulating effects of weathering on degradation of a nanosilica-low-density polyethylene (LDPE) composite. Release of nanosilica from LDPE composites is a potential source of toxic SiO2 . Nanosilica based LDPE composites were weathered under carefully controlled conditions by exposure to simulated sunlight. The effects of an added pro-oxidant on weathering was examined. Weathering of the composites with pro-oxidant was determined by quantifying changes in infrared spectroscopic properties (Fourier transform infrared spectroscopy / FTIR); mechanical properties, atomic force microscopy (AFM), scanning electron microscopy and other procedures. Wavelength effects on weathering rates were determined in a series of irradiations using simulated solar radiation passed through light filters that blocked different parts of the ultraviolet spectral region. Rates and spectral irradiance were then analyzed to develop spectral weighting functions (SWFs) that quantify wavelength effects on the sunlight-induced weathering of the pro-oxidant amended composites.
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