Detergent impurity effect on recycled HDPE: Properties after repetitive processing

Ville Mylläri, Samuel Hartikainen, Valeria Poliakova, Reetta Anderson, Ilari Jönkkäri, Pertti Pasanen, Mirja Andersson, Jyrki Vuorinen

    Research output: Contribution to journalArticleScientificpeer-review

    7 Citations (Scopus)

    Abstract

    High density polyethylene (rHDPE) is extruded 1 to 8 times, with and without detergent, to simulate the effects of impurities on the material and on the artificial ageing process. The mechanical properties, thermal stability, rheology, Fourier transform infrared spectroscopy (FTIR), and volatile organic compound (VOC) emissions are measured. According to the results, ageing of rHDPE increases tensile strength, reduces elongation, and enhances side chain branching of the material and thus causes rheological changes. The addition of detergent reduces changes in mechanical properties and rheological behavior but accelerates thermal degradation. VOC and FTIR measurements of the samples with detergent addition show generation of harmful 1,4-dioxane. The amount of total emission, as well as emissions of important perfumes limonene and 1R-α-pinene, decreases during multiple extrusion cycles. Heating of the plastics is found to be a major factor in the VOC emission reduction. Impurities have a notable effect on the artificial ageing results.

    Original languageEnglish
    Article number43766
    JournalJournal of Applied Polymer Science
    Volume133
    Issue number31
    DOIs
    Publication statusPublished - 15 Aug 2016
    Publication typeA1 Journal article-refereed

    Keywords

    • Ageing
    • Degradation
    • Polyolefins
    • Recycling

    Publication forum classification

    • Publication forum level 1

    ASJC Scopus subject areas

    • Chemistry(all)
    • Surfaces, Coatings and Films
    • Polymers and Plastics
    • Materials Chemistry

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