MATERIALS | POLYOLEFINS
even be used for sensitive applications with high requirements, such as drinking water systems.
Academic study At a more academic level, a recent study in Research Square – a pre-print platform – examined a way of de-crosslinking HDPE for use in heating pipes using supercritical fluids, then recycling them into standard polyethylene. “Waste crosslinked HDPE (PEX) is mostly
incinerated because it is a thermosetting plastic and cannot be recycled,” said the researchers from Gachon University in South Korea. “There is an urgent need to develop new recycling technolo- gies for PEX to prevent environmental pollution.” They said that many experiments have been conducted under various sub- and supercritical conditions using ethanol as the supercritical solvent to recycle PEX. In this study, the researchers used methanol – which allowed PE to be prepared via a de-crosslinking reaction. The study evaluated the characteristics of
recycled polyethylene based on the reaction conditions using Fourier transform infrared spectroscopy (FT-IR), gel permeation chromatogra-
phy (GPC), X-ray diffraction (XRD), differential scanning calorimetry (DSC), and tensile strength analyses. The scientists found it was possible to de-cross-
link PEX using supercritical methanol. The effects of the reaction temperature and screw rotational speed were signi ficant, they added. “When the reaction temperature increased, the
crosslinking reaction and physical properties could be regulated,” they said. The de-crosslinking reaction did not involve any
side reactions except for the breakage of some main chains. The ‘recovered’ PE had the same chemical structure as the raw material and showed similar physical properties, they said.
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