Reduction in HDPE Geomembrane Thermal Expansion using Nanoclay Particles

摘要

This study investigates the use of nanoclay particles to reduce high density polyethylene (HDPE) thermal expansion for application in geotechnical engineering. Nanocomposite samples were prepared with various ratios of nanoclay and the addition of various amounts of four different compatibilizing agents. The coefficient of linear thermal expansion was measured using a dynamic mechanical analyzer. It was computed between 35 and 50℃. The degree of exfoliation of the nanoclay particles in the samples was assessed by transmission electron microscopy on specimens prepared with an ultramicrotome. A more or less significant reduction in HDPE thermal expansion was obtained depending on the compatibilizing agent. On the other hand, the compatibilizing agents tested did not appear to produce an exfoliation of the nanoclay particles, which remained in an intercalated configuration.