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Electrospinning of recycled PET to generate tough mesomorphic fibre membranes for smoke filtration
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology, Polymeric Materials.ORCID iD: 0000-0002-7674-0262
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology, Polymeric Materials.ORCID iD: 0000-0001-5867-0531
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology, Polymeric Materials.
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2015 (English)In: Journal of Materials Chemistry A, ISSN 2050-7488, Vol. 3, no 4, 1632-1640 p.Article in journal (Refereed) Published
Abstract [en]

Tough fibrous membranes for smoke filtration have been developed from recycled polyethylene terephthalate (PET) bottles by solution electrospinning. The fibre thicknesses were controlled from 0.4 to 4.3 mu m by adjustment of the spinning conditions. The highest fibre strength and toughness were obtained for fibres with an average diameter of 1.0 mu m, 62.5 MPa and 65.8 MJ m(-3), respectively. The X-ray diffraction (XRD) patterns of the fibres showed a skewed amorphous halo, whereas the differential scanning calorimetry (DSC) results revealed an apparent crystallinity of 6-8% for the 0.4 and 1 mu m fibres and 0.2% crystallinity for the 4.3 mu m fibres. Heat shrinkage experiments were conducted by exposing the fibres to a temperature above their glass transition temperature (T-g). The test revealed a remarkable capability of the thinnest fibres to shrink by 50%, which was in contrast to the 4.3 mu m fibres, which displayed only 4% shrinkage. These thinner fibres aka showed a significantly higher glass transition temperature (+15 degrees C) than that of the 4.3 mu m fibres. The results suggested an internal morphology with a high degree of molecular orientation in the amorphous segments along the thinner fibres, consistent with a constrained mesomorphic phase formed during their rapid solidification in the electric field. Air filtration was demonstrated with cigarette smoke as a model substance passed through the fibre mats. The 0.4 mu m fibres showed the most effective smoke filtration and a capacity to absorb 43x its own weight in smoke residuals. whereas the 1 mu m fibres showed the best combination of filtration capacity (32x) and mechanical robustness. The use of recycled PET in the form of nanofibres is a novel way of turning waste into higher-value products.

Place, publisher, year, edition, pages
2015. Vol. 3, no 4, 1632-1640 p.
Keyword [en]
Differential scanning calorimetry, Electric fields, Electrospinning, Fibrous membranes, Filtration, Glass, Glass transition, Microfiltration, Molecular orientation, Plastic bottles, Polyethylenes, Rapid solidification, Recycling, Shrinkage, Smoke, Spinning (fibers), Temperature, X ray diffraction, Average diameter, Cigarette smokes, Filtration capacity, Internal morphology, Mechanical robustness, Mesomorphic phase, Recycled polyethylene terephthalates, Spinning conditions
National Category
Materials Chemistry
Identifiers
URN: urn:nbn:se:kth:diva-159360DOI: 10.1039/c4ta06191hISI: 000346906100035Scopus ID: 2-s2.0-84919884625OAI: oai:DiVA.org:kth-159360DiVA: diva2:784734
Note

QC 20150130

Available from: 2015-01-30 Created: 2015-01-29 Last updated: 2017-12-05Bibliographically approved

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Wu, QiongPourrahimi, Amir MasoudAndersson, Richard L.

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Wu, QiongPourrahimi, Amir MasoudHedenqvist, Mikael S.Olsson, Richard T.Andersson, Richard L.
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