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Comparing carbon nanotubes and graphene nanoplatelets as reinforcements in polyamide 12 composites
2011 (English)In: Nanotechnology, ISSN 0957-4484, E-ISSN 1361-6528, Vol. 22, no 27, 275714- p.Article in journal (Refereed) Published
Abstract [en]

We investigate the influence of nanofillers including carbon nanotubes (CNTs) and graphene nanoplatelets on a thermoplastic engineering polymer, polyamide 12 (PA12). The comparison between these two important nanofillers as to how they influence the structure and properties of the polymer is systematically studied. The polymer–nanofiller composites were prepared using a twin-screw micro-extruder and the composite was thereafter hot pressed into thin films. The structure (using wide angle x-ray diffraction and differential scanning calorimetry) and properties (through tensile testing and conductivity measurement) of the thin films have been investigated. The composites incorporating surfactant showed the best CNT distribution and dispersion, causing an improvement of up to 80% in the toughness modulus over pure PA12. Electrical percolation could also be achieved at nanofiller concentrations of 1 to 2 wt%. In this study we observed that CNT fillers bring about more pronounced improvements in PA12 compared to graphene nanoplatelets, as far as mechanical and electrical properties are concerned.

Place, publisher, year, edition, pages
2011. Vol. 22, no 27, 275714- p.
Keyword [en]
CNT, Polymer composite, Graphene
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:uu:diva-168031DOI: 10.1088/0957-4484/22/27/275714OAI: oai:DiVA.org:uu-168031DiVA: diva2:490044
Available from: 2012-02-06 Created: 2012-02-03 Last updated: 2017-12-08Bibliographically 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.
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 913
Keyword
Polymer, Composite, Carbon nanotube, Graphene
National Category
Composite Science and Engineering
Identifiers
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)
Opponent
Supervisors
Available from: 2012-04-11 Created: 2012-03-19 Last updated: 2012-04-19

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Chatterjee, Sanjukta

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