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Investigation of crystalline and tensile properties of carbon nanotube-filled polyamide-12 fibers melt-spun by industry-related processes
2012 (English)In: Journal of Engineered Fibers and Fabrics, ISSN 1558-9250, Vol. 7, no 3Article in journal (Refereed) Published
Abstract [en]

The paper addresses the influence of carbon nanotubes (CNT) on the structure and mechanical properties of high tensile strength thermoplasticpolymer fibers. Polyamide (PA) fibers with different draw ratios, with and without CNTs as fillers, and having mechanical properties close to industrial standards were spun in a pilot melt spinning plant. The morphology of the fibers was investigated using optical microscopy, nuclear magnetic resonance (NMR) and 2-D wide angle x-ray diffraction (WAXD). Differential scanning calorimetry (DSC) was carried out to get an estimation of the crystallinity. For a concise interpretation of the results of tensile measurements performed on the fibers, a parameter was developed to account for the detrimental influence of polymer extrusion on their mechanical properties. CNTs seem to act as sites for the growth of un-oriented crystalline domains converted from oriented regions, without yielding a mechanical reinforcing effect.

Place, publisher, year, edition, pages
2012. Vol. 7, no 3
National Category
Composite Science and Engineering
URN: urn:nbn:se:uu:diva-169990OAI: diva2:508128
Available from: 2012-03-13 Created: 2012-03-07 Last updated: 2013-02-28Bibliographically approved
In thesis
1. Structural and Physical Effects of Carbon Nanofillers in Thermoplastic and Thermosetting Polymer Systems
Open this publication in new window or tab >>Structural and Physical Effects of Carbon Nanofillers in Thermoplastic and Thermosetting Polymer Systems
2012 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Ever since the discovery of carbon nano materials like carbon nanotube (CNT) and graphene, this class of materials has gained significant attention due to their exotic properties. The principle idea of my present research project is to understand the novel improvements induced in polymer matrices with inclusion of the nanofillers. This thesis is thematically divided into three parts.

In the first part we introduce principle materials that we use for preparation of composites. Methods of nanofiller preparation and different nanocomposites as previously reported in literature are discussed to formulate the basis of our study. Different dispersion techniques are discussed which facilitate uniform nanofiller distribution. A variety of experimental methods are described which were employed to investigate the structure and properties of the composites.

In the second part we discuss in details polyamide-12 (PA12) composites using CNT and graphene as fillers. A marked improvement is recorded in the toughness of the films with incorporation of CNT, dispersed in PA12 using a surfactant. Electrical percolation is also achieved in the otherwise insulating matrix. With PA-12 fibers we explored the effect of fiber processing and CNT incorporation in the mechanical properties. Extensive wide angle x-ray diffraction was carried out to interpret the structural modifications brought about by CNT in the matrix.

The final part of the thesis deals with a thermosetting polymer, epoxy composites. CNT, Graphene and also a mixture of the two nanofillers were used as reinforcing agents. Appreciable improvement was recorded in the mechanical properties, electrical and thermal conductivity of the composites. Detailed optical and electron microscopy was carried out to get a vivid idea of the micro-structure and dispersion.

The presented work demonstrates the significant ability of carbon nanofillers to reinforce polymer matrices enhancing their mechanical, electrical and thermal properties and opening a wide horizon for a variety of applications.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2012. xiv+96 p.
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 913
Polymer, Composite, Carbon nanotube, Graphene
National Category
Composite Science and Engineering
urn:nbn:se:uu:diva-171449 (URN)978-91-554-8315-9 (ISBN)
Public defence
2012-05-04, Polhelmssalen, Ångström Laboratory, Lägerhyddsvägen 1, Uppsala, 10:15 (English)
Available from: 2012-04-11 Created: 2012-03-19 Last updated: 2012-04-19

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