Mohamad Hassan Akhras, Jörg Fischer, Michael Hettrich-Keller,
"The influence of the sample preparation steps on the properties of pre-treated polyolefin waste ? Problems & Solutions"
, in Verlag der Technischen Universität Graz: Polymer Meeting 14 Book of Abstracts, Seite(n) 109, 2021
Original Titel:
The influence of the sample preparation steps on the properties of pre-treated polyolefin waste ? Problems & Solutions
Sprache des Titels:
Englisch
Original Buchtitel:
Polymer Meeting 14 Book of Abstracts
Original Kurzfassung:
For the conversion of plastic waste into high quality recyclates, the characterization and
quality control of incoming materials is essential. Therefore, a proper sample preparation
is required to generate datasets with a high precision. Based on the acquired data, it is
possible to optimize process steps and processing parameters while meeting target quality
characterisitcs of specific products.
Milling and compounding of the incoming materials can, potentially, be used to improve
the homogenization of plastic waste. Hence, the representativeness of the generated data
will be increased. This study, comprehensively, investigates the influence of sample
preparation by comparing the impact of milling and compounding on the properties of
different polyolefin (PO) waste streams.Samples of five different pre-treated PO feedstocks, two polypropylene (PP) dominated
and three color-sorted high-density polyethylene (PE-HD) dominated mixtures, were
milled and compounded. Additionally, further processing technologies (e.g., milling
technologies, injection molding, pressing) were conducted on one PP and one PE-HD
grades to find the best practice sample preparation. Melt flow rate (MFR), plate-plate
rheology test, differential thermal analysis (DTA), and mechanical tests were performed to
determine the impact of processing on melt properties, material resistance to oxidation, and
mechanical performance. For both POs, the detected properties were affected by the
various sample preparation steps. However, the impact of milling was less evident in the
rheology of the materials than that of compounding. Nevertheless, both processes can be
used to map out the property profile of a waste stream. While milling can help determine
the actual material property profile of the flakes, compounding can provide an approximate
prediction of the property profile of granules after processing with a recycling machine.
Forschungs-