Authors
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Spicker, C. ; Rudolph, N. ; Kühnert, I. ; Aumnate, C.
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Title
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The use of rheological behavior to monitor the processing and service life properties of recycled polypropylene
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Date
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01.03.2019
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Number
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56463
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Abstract
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The influence of multiple reprocessing cycles on the rheological, thermal and mechanical properties of pre-consumer polypropylene (PP) waste (or manufacturing scrap) was investigated. An increase in the melt flow rate (MFR) and a decrease in the viscosity and the mass average molecular weight were found as well as a narrowing of the molecular weight distribution. As a typical industry practice, manufacturing scrap is often mixed with virgin material. Thus, production material with 70% regrind was also examined. The measured properties followed the same trends as for reprocessing without refreshing. A separate investigation of thermal and thermal oxidative degradation showed a constant MFR at processing temperatures for thermally degraded material and a significant increase for thermal oxidative tests. The results provide a better understanding of the degradation mechanisms of PP and show that the rheological behaviors, MFR and melt viscosity, are well suited to assess these effects.
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Publisher
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Food Packaging and Shelflife
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Wikidata
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Citation
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Food Packaging and Shelflife 19 (2019) 174-183
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DOI
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https://doi.org/10.1016/j.fpsl.2019.01.002
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Tags
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