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Mechanical reinforcement and thermal conductivity in expanded graphene nanoplatelets reinforced epoxy composites
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2012 (Engelska)Ingår i: Chemical Physics Letters, ISSN 0009-2614, E-ISSN 1873-4448, Vol. 531, s. 6-10Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Influence of reinforcements on mechanical and thermal properties of graphene nanoplatelets/epoxy com-posites is investigated. Amine functionalized expanded graphene nanoplatelets (EGNPs) were dispersed within epoxy resins using high-pressure processor followed by three roll milling. Functionality on the EGNPs was confirmed with FTIR and micro-Raman spectroscopy. Bending and nano-mechanical testingwas performed on the composites. Incorporation of EGNPs improved the flexural modulus and hardness of the composite and increased fracture toughness by up to 60%. Marked improvement was observed inthermal conductivity of the composites reaching 36% at 2 wt.% loading. Functionalized EGNPs exhibited significant improvements indicating favorable interaction at EGNPs/polymer interface.

Ort, förlag, år, upplaga, sidor
2012. Vol. 531, s. 6-10
Nationell ämneskategori
Kompositmaterial och -teknik
Identifikatorer
URN: urn:nbn:se:uu:diva-169994DOI: 10.1016/j.cplett.2012.02.006OAI: oai:DiVA.org:uu-169994DiVA, id: diva2:508132
Tillgänglig från: 2012-03-13 Skapad: 2012-03-07 Senast uppdaterad: 2017-12-07Bibliografiskt granskad
Ingår i avhandling
1. Structural and Physical Effects of Carbon Nanofillers in Thermoplastic and Thermosetting Polymer Systems
Öppna denna publikation i ny flik eller fönster >>Structural and Physical Effects of Carbon Nanofillers in Thermoplastic and Thermosetting Polymer Systems
2012 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
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.

Ort, förlag, år, upplaga, sidor
Uppsala: Acta Universitatis Upsaliensis, 2012. s. xiv+96
Serie
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 913
Nyckelord
Polymer, Composite, Carbon nanotube, Graphene
Nationell ämneskategori
Kompositmaterial och -teknik
Identifikatorer
urn:nbn:se:uu:diva-171449 (URN)978-91-554-8315-9 (ISBN)
Disputation
2012-05-04, Polhelmssalen, Ångström Laboratory, Lägerhyddsvägen 1, Uppsala, 10:15 (Engelska)
Opponent
Handledare
Tillgänglig från: 2012-04-11 Skapad: 2012-03-19 Senast uppdaterad: 2012-04-19

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