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Micromechanical Tensile Testing of Cellulose-Reinforced Electrospun Fibers Using a Template Transfer Method (TTM)
KTH, Skolan för kemivetenskap (CHE), Fiber- och polymerteknik, Polymera material.ORCID-id: 0000-0002-0236-5420
KTH, Skolan för kemivetenskap (CHE), Centra, Wallenberg Wood Science Center.
KTH, Skolan för kemivetenskap (CHE), Fiber- och polymerteknik. KTH, Skolan för kemivetenskap (CHE), Centra, Wallenberg Wood Science Center.ORCID-id: 0000-0001-5818-2378
Visa övriga samt affilieringar
2012 (Engelska)Ingår i: Journal of polymers and the environment, ISSN 1064-7546, E-ISSN 1572-8900, Vol. 20, nr 4, s. 967-975Artikel i tidskrift (Refereegranskat) 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.

Ort, förlag, år, upplaga, sidor
2012. Vol. 20, nr 4, s. 967-975
Nyckelord [en]
Cellulose crystals (NFC), Electrospinning, Micro mechanical tensile testing, PMMA, Template transfer method (TTM)
Nationell ämneskategori
Polymerteknologi
Identifikatorer
URN: urn:nbn:se:kth:diva-115467DOI: 10.1007/s10924-012-0486-6ISI: 000312402900009Scopus ID: 2-s2.0-84871263311OAI: oai:DiVA.org:kth-115467DiVA, id: diva2:588845
Forskningsfinansiär
Sida - Styrelsen för internationellt utvecklingssamarbete
Anmärkning

QC 20130116

Tillgänglig från: 2013-01-16 Skapad: 2013-01-15 Senast uppdaterad: 2017-12-06Bibliografiskt granskad
Ingår i avhandling
1. Wood Nanocellulose Materials and Effects from Surface Modification of Nanoparticles
Öppna denna publikation i ny flik eller fönster >>Wood Nanocellulose Materials and Effects from Surface Modification of Nanoparticles
2013 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

Nanocellulose is an interesting natural material thatis gaining interest in the field of materials science, particularly nanocomposites. Depending on the disintegration route, nanocellulose can be isolated either in the form of long and flexible fibres (nanofibrillated cellulose, NFC), or stiff, rod-like crystals (cellulose nanocrystals, CNC). Nanocellulose can be utilized in nanocomposites either as a reinforcement element or as a network matrix due to its ability to form a strong network. In this thesis, nanocellulose based materials are prepared by evaporation of a liquid medium. The key step in this processing route is a good dispersion of the nanoparticles in the selected matrix. Therefore the importance of surface modification in order to ensure favourable nanocellulose dispersion is clarified in avariety of materials systems.

In Paper I, poly(methyl methacrylate) (PMMA) based fibres prepared by electrospinning were reinforced with nanofibrillated cellulose. Native NFC appeared to show a good compatibility with PMMA matrix in the electrospinning solution and resulting fibres. Furthermore, a new method for mechanical testing of mats with random fibre orientation as well as aligned fibres was developed.

In Paper II, commingled nanopaper structures with carbon nanotubes (CNTs) were prepared. Several surfactants were used to disperse hydrophobic CNTs in water. A nonylphenol phosphate ester (NPPE) was found to work well for both dispersing CNTs in water and providing compatibility with NFC through electrostatic repulsion between the phosphate ester groups of the surfactant and the carboxylate groups of NFC.

In Paper III, a new water based route for functionalization of cellulose nanocrystals was developed. In this approach, inspired by organo-modified layered silicates, quaternary ammonium salts were adsorbed. It was demonstrated that different functionalities (alkyl, phenyl, glycidylor diallyl) can be introduced onto the cellulose and the dispersibility in organic solvents was studied. Subsequently, in Paper IV, nanocomposites with poly(vinyl acetate) (PVAc)were prepared. The effect of modification on the degree of dispersion of the CNC within the matrix was studied as well as the strong effects on the properties of the resulting nanocomposites.

In Paper V, taking advantage of the entangled NFC network and the possibility to tailor the pore size and surface chemistry, lubricant-infused slippery films and coatings based on NFC were prepared for the first time.

Ort, förlag, år, upplaga, sidor
Stockholm: KTH Royal Institute of Technology, 2013. s. 55
Serie
Trita-CHE-Report, ISSN 1654-1081 ; 2013:40
Nyckelord
Nanocellulose, nanoc omposite, dispersion, surface modification, surfa ctant, poly(methyl methacrylate), poly(vinyl acetate), carbon nanotubes, electrospinning, lubricant - infused surfaces
Nationell ämneskategori
Naturvetenskap
Identifikatorer
urn:nbn:se:kth:diva-131469 (URN)978-91-7501-866-9 (ISBN)
Disputation
2013-11-01, F3, Lindstetsvägen 26, KTH, Stockholm, 10:00 (Engelska)
Opponent
Handledare
Anmärkning

QC 20131016

Tillgänglig från: 2013-10-16 Skapad: 2013-10-16 Senast uppdaterad: 2013-10-16Bibliografiskt granskad
2. Structural properties and micromechanics of PMMA-based electrospun hybrid fibers
Öppna denna publikation i ny flik eller fönster >>Structural properties and micromechanics of PMMA-based electrospun hybrid fibers
2013 (Engelska)Licentiatavhandling, sammanläggning (Övrigt vetenskapligt)
Ort, förlag, år, upplaga, sidor
Stockholm: KTH Royal Institute of Technology, 2013. s. x, 28
Serie
TRITA-CHE-Report, ISSN 1654-1081 ; 2013:42
Nationell ämneskategori
Polymerkemi
Identifikatorer
urn:nbn:se:kth:diva-133788 (URN)978-91-7501-876-8 (ISBN)
Presentation
2013-10-24, B2, Brinellvägen 23, KTH, Stockholm, 10:00 (Engelska)
Opponent
Handledare
Anmärkning

QC 20131111

Tillgänglig från: 2013-11-11 Skapad: 2013-11-11 Senast uppdaterad: 2015-08-21Bibliografiskt granskad
3. Micromechanical, Antimicrobial and Filtration Properties of Electrospun Fiber Mats
Öppna denna publikation i ny flik eller fönster >>Micromechanical, Antimicrobial and Filtration Properties of Electrospun Fiber Mats
2014 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Ort, förlag, år, upplaga, sidor
Stockholm: KTH Royal Institute of Technology, 2014. s. xiv, 67
Serie
TRITA-CHE-Report, ISSN 1654-1081 ; 2014:47
Nationell ämneskategori
Polymerteknologi
Identifikatorer
urn:nbn:se:kth:diva-156091 (URN)978-91-7595-320-5 (ISBN)
Disputation
2014-12-11, K1, Teknikringen 56, KTH, Stockholm, 13:00 (Engelska)
Opponent
Handledare
Anmärkning

QC 20141121

Tillgänglig från: 2014-11-21 Skapad: 2014-11-21 Senast uppdaterad: 2015-08-21Bibliografiskt granskad

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