Micromechanical Tensile Testing of Cellulose-Reinforced Electrospun Fibers Using a Template Transfer Method (TTM)
2012 (English)In: Journal of polymers and the environment, ISSN 1566-2543, E-ISSN 1572-8900, Vol. 20, no 4, 967-975 p.Article in journal (Refereed) Published
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.
Place, publisher, year, edition, pages
2012. Vol. 20, no 4, 967-975 p.
Cellulose crystals (NFC), Electrospinning, Micro mechanical tensile testing, PMMA, Template transfer method (TTM)
IdentifiersURN: urn:nbn:se:kth:diva-115467DOI: 10.1007/s10924-012-0486-6ISI: 000312402900009ScopusID: 2-s2.0-84871263311OAI: oai:DiVA.org:kth-115467DiVA: diva2:588845
FunderSida - Swedish International Development Cooperation Agency
QC 201301162013-01-162013-01-152014-11-21Bibliographically approved