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Release of micro- and nanoparticles from a polypropylene/clay nanocomposite, a methodology for controlled degradation and evaluation
KTH Royal Institute of Technology, Sweden.
KTH Royal Institute of Technology, Sweden.
RISE Research Institutes of Sweden, Built Environment, Infrastructure and concrete technology.ORCID iD: 0000-0002-7724-2329
KTH Royal Institute of Technology, Sweden.
2021 (English)In: Journal of Cleaner Production, ISSN 0959-6526, E-ISSN 1879-1786, Vol. 319, article id 128761Article in journal (Refereed) Published
Abstract [en]

A methodology was developed for qualitative assessment and characterisation of particle losses from nanocomposites during service life. The methodology can be generalised to other systems where the material fragments during ageing and can be extended to quantitative analysis. A chamber was constructed for ageing of selected materials, which enabled effective collection and subsequent analysis of released particles. A combination of scanning and transmission electron microscopy and energy dispersive X-ray spectroscopy was found to be suitable for characterising particles in terms of size, shape and content. The methodology was tested on a common nanoclay composite with polypropylene as the matrix. There was no need for physical/mechanical wear to generate particles, slow flow of air and elevated temperature led to cracking and fragmentation of the material, and subsequent release of nanocomposite particles containing embedded or protruding clay. The release of pure clay particles and polypropylene particles was also detected. Using the methodology, it was observed that even in ‘mild’ degradation conditions (pure thermo-oxidation with no wear), fillers and nanocomposite particles can be released to the environment, which is an environmental and health concern. © 2021 The Authors

Place, publisher, year, edition, pages
Elsevier Ltd , 2021. Vol. 319, article id 128761
Keywords [en]
Ageing, Clay, Microparticles, Microplastics, Nanocomposite, Release, Energy dispersive spectroscopy, High resolution transmission electron microscopy, Microplastic, Particle size analysis, Polypropylenes, Scanning electron microscopy, Thermooxidation, Wear of materials, Clay nanocomposites, Controlled degradation, Micro- and nano-particles, Nanocomposite particle, Particle loss, Qualitative assessments, Qualitative characterization, Nanocomposites
National Category
Composite Science and Engineering
Identifiers
URN: urn:nbn:se:ri:diva-56677DOI: 10.1016/j.jclepro.2021.128761Scopus ID: 2-s2.0-85113398981OAI: oai:DiVA.org:ri-56677DiVA, id: diva2:1614109
Note

Funding details: Svenska Forskningsrådet Formas, 216-2013-1419; Funding text 1: This project was funded by Formas ; project number: 216-2013-1419 . We thank Henrik Petersen for the help with the X-Ray diffraction measurements.

Available from: 2021-11-24 Created: 2021-11-24 Last updated: 2021-11-24Bibliographically approved

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Enebro, Jonas

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