Comparison of Properties with Relevance for the Automotive Sector in Mechanically Recycled and Virgin Polypropylene

Recycling

卷:6

Henning Stoll¹  Abdelhak Ladhari¹  Sven Sängerlaub¹  Esra Kucukpinar² 

[1] Department of Mechanical, Automotive and Aeronautical Engineering, Munich University of Applied Sciences HM, Lothstraße 38, 80335 Munich, Germany;

[2] Fraunhofer Institute for Process Engineering and Packaging IVV, Giggenhauser Strasse 35, 85354 Freising, Germany;

关键词: recycling;    polypropylene;    polypropylene recyclates;    mechanical properties;    rheological properties;    automotive;   

DOI  :  10.3390/recycling6040076

来源: DOAJ

【 摘 要 】

Polypropylene (PP) has a high recycling potential. However, the properties of mechanically recycled PP (R-PP) have not been fully compared to those of virgin PP (V-PP). Therefore, in this study, properties of R-PP and V-PP were compared using data from recyclers, virgin plastic suppliers, and the literature. The properties of recyclates could not be directly correlated either with the properties of the virgin polymers from which the recyclates were made or the recycling parameters. It was found that the MFR of R-PP was higher; MFR R-PP had a median value (m) of 11 g/10 min while MFR V-PP had a median value of 6.3 g/10 min (at 230 °C and with 2.16 kg). In terms of mechanical properties, in many cases R-PP exhibited stiffer and more brittle behavior, with a slightly higher Young’s modulus (E_R-PP = 1400 and E_V-PP = 1200 MPa), a reduced elongation at break (ɛb_R-PP = 4 l.-% and ɛb_V-PP = 83 l.-%), and notched charpy impact strength (NCIS_R-PP = 4.8 and NCIS_V-PP = 7.5 kJ/m²). However, the values for every property had a broad distribution. In addition to existing information from the literature, our research sheds fresh light on the variation of the characteristics of recycled polypropylenes presently on the market.

【 授权许可】

Unknown