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Micromechanical, Antimicrobial and Filtration Properties of Electrospun Fiber Mats
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology, Polymeric Materials.ORCID iD: 0000-0002-0236-5420
2014 (English)Doctoral thesis, comprehensive summary (Other academic)
Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2014. , xiv, 67 p.
Series
TRITA-CHE-Report, ISSN 1654-1081 ; 2014:47
National Category
Polymer Technologies
Identifiers
URN: urn:nbn:se:kth:diva-156091ISBN: 978-91-7595-320-5 (print)OAI: oai:DiVA.org:kth-156091DiVA: diva2:765151
Public defence
2014-12-11, K1, Teknikringen 56, KTH, Stockholm, 13:00 (English)
Opponent
Supervisors
Note

QC 20141121

Available from: 2014-11-21 Created: 2014-11-21 Last updated: 2015-08-21Bibliographically approved
List of papers
1. Micromechanical Tensile Testing of Cellulose-Reinforced Electrospun Fibers Using a Template Transfer Method (TTM)
Open this publication in new window or tab >>Micromechanical Tensile Testing of Cellulose-Reinforced Electrospun Fibers Using a Template Transfer Method (TTM)
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2012 (English)In: Journal of polymers and the environment, ISSN 1064-7546, E-ISSN 1572-8900, Vol. 20, no 4, 967-975 p.Article in journal (Refereed) Published
Abstract [en]

A template transfer method (TTM) and a fiber fixation technique were established for fiber handling and micro tensile stage mounting of aligned and non-aligned electrospun fiber mats. The custom-made template had been precut to be mounted on a variety of collectors, including a rapidly rotating collector used to align the fibers. The method eliminated need for direct physical interaction with the fiber mats before or during the tensile testing since the fiber mats were never directly clamped or removed from the original substrate. By using the TTM it was possible to measure the tensile properties of aligned poly(methyl methacrylate) (PMMA) fiber mats, which showed a 250 % increase in strength and 450 % increase in modulus as compared to a non-aligned system. The method was further evaluated for aligned PMMA fibers reinforced with cellulose (4 wt%) prepared as enzymatically derived nanofibrillated cellulose (NFC). These fibers showed an additional increase of 30 % in both tensile strength and modulus, resulting in a toughness increase of 25 %. The fracture interfaces of the PMMA-NFC fibers showed a low amount of NFC pull-outs, indicating favorable phase compatibility. The presented fiber handling technique is universal and may be applied where conservative estimates of mechanical properties need to be assessed for very thin fibers.

Keyword
Cellulose crystals (NFC), Electrospinning, Micro mechanical tensile testing, PMMA, Template transfer method (TTM)
National Category
Polymer Technologies
Identifiers
urn:nbn:se:kth:diva-115467 (URN)10.1007/s10924-012-0486-6 (DOI)000312402900009 ()2-s2.0-84871263311 (Scopus ID)
Funder
Sida - Swedish International Development Cooperation Agency
Note

QC 20130116

Available from: 2013-01-16 Created: 2013-01-15 Last updated: 2017-12-06Bibliographically approved
2. Micromechanics of ultra-toughened electrospun PMMA/PEO fibres as revealed by in-situ tensile testing in an electron microscope
Open this publication in new window or tab >>Micromechanics of ultra-toughened electrospun PMMA/PEO fibres as revealed by in-situ tensile testing in an electron microscope
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2014 (English)In: Scientific Reports, ISSN 2045-2322, E-ISSN 2045-2322, Vol. 4, 6335- p.Article in journal (Refereed) 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.

National Category
Materials Chemistry
Identifiers
urn:nbn:se:kth:diva-153848 (URN)10.1038/srep06335 (DOI)000341934800001 ()
Note

QC 20141013

Available from: 2014-10-13 Created: 2014-10-09 Last updated: 2017-12-05Bibliographically approved
3. Antibacterial Properties of Tough and Strong Electrospun PMMA/PEO Fiber Mats Filled with Lanasol-A Naturally Occurring Brominated Substance
Open this publication in new window or tab >>Antibacterial Properties of Tough and Strong Electrospun PMMA/PEO Fiber Mats Filled with Lanasol-A Naturally Occurring Brominated Substance
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2014 (English)In: International Journal of Molecular Sciences, ISSN 1422-0067, E-ISSN 1422-0067, Vol. 15, no 9, 15912-15923 p.Article in journal (Refereed) Published
Abstract [en]

A new type of antimicrobial, biocompatible and toughness enhanced ultra-thin fiber mats for biomedical applications is presented. The tough and porous fiber mats were obtained by electrospinning solution-blended poly (methyl methacrylate) (PMMA) and polyethylene oxide (PEO), filled with up to 25 wt % of Lanasol-a naturally occurring brominated cyclic compound that can be extracted from red sea algae. Antibacterial effectiveness was tested following the industrial Standard JIS L 1902 and under agitated medium (ASTM E2149). Even at the lowest concentrations of Lanasol, 4 wt %, a significant bactericidal effect was seen with a 4-log (99.99%) reduction in bacterial viability against S. aureus, which is one of the leading causes of hospital-acquired (nosocomial) infections in the world. The mechanical fiber toughness was insignificantly altered up to the maximum Lanasol concentration tested, and was for all fiber mats orders of magnitudes higher than electrospun fibers based on solely PMMA. This antimicrobial fiber system, relying on a dissolved antimicrobial agent (demonstrated by X-ray diffraction and Infrared (IR)-spectroscopy) rather than a dispersed and "mixed-in" solid antibacterial particle phase, presents a new concept which opens the door to tougher, stronger and more ductile antimicrobial fibers.

Keyword
electrospinning, antimicrobial/antibacterial, Lanasol, nanofiber toughness, sea algae, poly (methyl methacrylate) (PMMA)/polyethylene oxide (PEO)
National Category
Chemical Sciences
Identifiers
urn:nbn:se:kth:diva-155803 (URN)10.3390/ijms150915912 (DOI)000343109700061 ()25207601 (PubMedID)2-s2.0-84908330150 (Scopus ID)
Funder
Sida - Swedish International Development Cooperation Agency
Note

QC 20141113

Available from: 2014-11-13 Created: 2014-11-13 Last updated: 2017-12-05Bibliographically approved
4. Electrospinning of recycled PET to generate strong mesomorphic fibre membranes for smoke filtration
Open this publication in new window or tab >>Electrospinning of recycled PET to generate strong mesomorphic fibre membranes for smoke filtration
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(English)Manuscript (preprint) (Other academic)
National Category
Chemical Sciences
Identifiers
urn:nbn:se:kth:diva-156155 (URN)
Note

QS 2014

Available from: 2014-11-21 Created: 2014-11-21 Last updated: 2014-11-21Bibliographically approved

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