uu.seUppsala University Publications
Change search
ReferencesLink to record
Permanent link

Direct link
Improvement of toughness and electrical properties of epoxy composites with carbon nanotubes prepared by industrially relevant processes
Show others and affiliations
2011 (English)In: Nanotechnology, ISSN 0957-4484, E-ISSN 1361-6528, Vol. 22, no 12, 125702- p.Article in journal (Refereed) Published
Abstract [en]

The addition of carbon nanotubes (CNTs) to polymeric matrices or master batches has thepotential to provide composites with novel properties. However, composites with a uniformdispersion of CNTs have proved to be difficult to manufacture, especially at an industrial scale.This paper reports on processing methods that overcome problems related to the control andreproducibility of dispersions. By using a high pressure homogenizer and a three-rollcalendaring mill in combination, CNT reinforced epoxies were fabricated by mould castingwith a well dispersed nanofiller content from 0.1 to 2 wt%. The influence of the nano-carbonreinforcements on toughness and electrical properties of the CNT/epoxies was studied. Asubstantial increase of all mechanical properties already appeared at the lowest CNT content of0.1 wt%, but further raising the nanofiller concentration only led to moderate further changes.The most significant enhancement was obtained for fracture toughness, reaching up to 82%.The low percolation thresholds were confirmed by electrical conductivity measurements on thesame composites yielding a threshold value of only about 0.01 wt%. As corroborated by athorough microscopic analysis of the composites, mechanical and electrical enhancement pointsto the formation of an interconnected network of agglomerated CNTs.

Place, publisher, year, edition, pages
2011. Vol. 22, no 12, 125702- p.
Keyword [en]
CNT, Epoxy
National Category
Composite Science and Engineering
Research subject
Materials Science
URN: urn:nbn:se:uu:diva-169989DOI: 10.1088/0957-4484/22/12/125702OAI: oai:DiVA.org:uu-169989DiVA: diva2:508126
Available from: 2012-03-13 Created: 2012-03-07 Last updated: 2012-04-13Bibliographically 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

Open Access in DiVA

No full text

Other links

Publisher's full text

Search in DiVA

By author/editor
Chatterjee, Sanjukta
In the same journal
Composite Science and Engineering

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

Total: 203 hits
ReferencesLink to record
Permanent link

Direct link