Mixed post-consumer recycled polyolefins as a property tuning material for virgin polypropylene

dc.contributor.author Curtzwiler, Greg
dc.contributor.author Li, Yifan
dc.contributor.author Jiang, Shan
dc.contributor.author Vorst, Keith L.
dc.contributor.department Food Science and Human Nutrition
dc.contributor.department Chemical and Biological Engineering
dc.contributor.department Materials Science and Engineering
dc.contributor.other material
dc.date.accessioned 2021-10-19T17:02:07Z
dc.date.available 2021-10-19T17:02:07Z
dc.date.issued 2019-12-01
dc.description.abstract Polyethylene and polypropylene are widely used packaging materials that are commonly present in the same waste-streams (e.g., beverage bottle enclosures, laminated flexible packaging). Since these immiscible plastics are difficult to separate with current recycling practices, it is critical to understand the influence of mixed polyolefin post-consumer recycled feedstock composition on key performance properties of recycled blends for widespread industrial adoption. This research comprehensively characterized the optical, thermal, mechanical, morphological, and gas barrier properties of melt blended virgin polypropylene/mixed post-consumer recycled polyolefin materials at different blend ratios. The results strongly indicate that polyolefin beverage container enclosures can be melt blended with virgin polypropylene to tune physical performance properties (74% increased yield stress, 49% increased strain at yield, 160% increased UV blocking, 30–40% gas transmission reduction) and simultaneously reduce environmental contamination. Most measured properties followed the Law of Mixtures which enables highly predictable and tunable properties via precision melt blending of post-consumer recycled and virgin plastic. We hypothesize that increased compatibilization of polyolefin amorphous regions from plastic oxidation and structural changes in the plastic crystalline domains directly influence plastic physical properties. These data fill current knowledge gaps that post-consumer materials can provide value beyond sustainability to justify innovative landfill diversion strategies and realize a more circular economy.
dc.description.comments This accepted article is published as Curtzwiler, Greg W.*, Schweitzer, Matt., Jiang, Shan., Vorst, Keith. Mixed Post-Consumer Recycled Polyolefins as a Property Tuning Material for Virgin Polypropylene. Journal of Cleaner Production. 239 (2019) 117978. https://doi.org/10.1016/j.jclepro.2019.117978
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/qzoDJXnw
dc.language.iso en_US
dc.publisher Elsevier
dc.source.uri https://doi.org/10.1016/j.jclepro.2019.117978 *
dc.subject.disciplines DegreeDisciplines::Engineering::Materials Science and Engineering::Polymer and Organic Materials
dc.subject.disciplines DegreeDisciplines::Life Sciences::Food Science
dc.subject.disciplines DegreeDisciplines::Life Sciences::Food Science::Food Processing
dc.subject.disciplines DegreeDisciplines::Engineering::Chemical Engineering::Polymer Science
dc.subject.keywords Recycling
dc.subject.keywords Post-consumer recycled
dc.subject.keywords Polyolefin
dc.subject.keywords Polypropylene
dc.subject.keywords Polyethylene
dc.subject.keywords Plastic processing
dc.title Mixed post-consumer recycled polyolefins as a property tuning material for virgin polypropylene
dc.type Article
dspace.entity.type Publication
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