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Micromechanics of ultra-toughened electrospun PMMA/PEO fibres as revealed by in-situ tensile testing in an electron microscope
KTH, Skolan för kemivetenskap (CHE), Fiber- och polymerteknik, Polymera material.ORCID-id: 0000-0002-0236-5420
KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap, Teknisk materialfysik.ORCID-id: 0000-0003-2170-0076
KTH, Skolan för kemivetenskap (CHE), Fiber- och polymerteknik, Polymera material.
Vise andre og tillknytning
2014 (engelsk)Inngår i: Scientific Reports, ISSN 2045-2322, E-ISSN 2045-2322, Vol. 4, s. 6335-Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

A missing cornerstone in the development of tough micro/nano fibre systems is an understanding of the fibre failure mechanisms, which stems from the limitation in observing the fracture of objects with dimensions one hundredth of the width of a hair strand. Tensile testing in the electron microscope is herein adopted to reveal the fracture behaviour of a novel type of toughened electrospun poly(methyl methacrylate)/poly(ethylene oxide) fibre mats for biomedical applications. These fibres showed a toughness more than two orders of magnitude greater than that of pristine PMMA fibres. The in-situ microscopy revealed that the toughness were not only dependent on the initial molecular alignment after spinning, but also on the polymer formulation that could promote further molecular orientation during the formation of micro/nano-necking. The true fibre strength was greater than 150 MPa, which was considerably higher than that of the unmodified PMMA (17 MPa). This necking phenomenon was prohibited by high aspect ratio cellulose nanocrystal fillers in the ultra-tough fibres, leading to a decrease in toughness by more than one order of magnitude. The reported necking mechanism may have broad implications also within more traditional melt-spinning research.

sted, utgiver, år, opplag, sider
2014. Vol. 4, s. 6335-
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Identifikatorer
URN: urn:nbn:se:kth:diva-153848DOI: 10.1038/srep06335ISI: 000341934800001OAI: oai:DiVA.org:kth-153848DiVA, id: diva2:754943
Merknad

QC 20141013

Tilgjengelig fra: 2014-10-13 Laget: 2014-10-09 Sist oppdatert: 2017-12-05bibliografisk kontrollert
Inngår i avhandling
1. Micromechanical, Antimicrobial and Filtration Properties of Electrospun Fiber Mats
Åpne denne publikasjonen i ny fane eller vindu >>Micromechanical, Antimicrobial and Filtration Properties of Electrospun Fiber Mats
2014 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
sted, utgiver, år, opplag, sider
Stockholm: KTH Royal Institute of Technology, 2014. s. xiv, 67
Serie
TRITA-CHE-Report, ISSN 1654-1081 ; 2014:47
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urn:nbn:se:kth:diva-156091 (URN)978-91-7595-320-5 (ISBN)
Disputas
2014-12-11, K1, Teknikringen 56, KTH, Stockholm, 13:00 (engelsk)
Opponent
Veileder
Merknad

QC 20141121

Tilgjengelig fra: 2014-11-21 Laget: 2014-11-21 Sist oppdatert: 2015-08-21bibliografisk kontrollert

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