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Reduced and Surface-Modified Graphene Oxide with Nonlinear Resistivity
KTH, Ytbehandlingsteknik.ORCID iD: 0000-0002-3310-9964
KTH, Polymera material.ORCID iD: 0000-0002-5010-5391
KTH, Polymera material.ORCID iD: 0000-0002-0236-5420
KTH, Ytbehandlingsteknik.ORCID iD: 0000-0002-8194-0058
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2017 (English)In: Macromolecular rapid communications, ISSN 1022-1336, E-ISSN 1521-3927, Vol. 38, no 16, article id 1700291Article in journal (Refereed) Published
Abstract [en]

Field-grading materials (FGMs) are used to reduce the probability for electrical breakdowns in critical regions of electrical components and are therefore of great importance. Usually, FGMs are heavily filled (40 vol.%) with semi-conducting or conducting particles. Here, polymer-grafted reduced graphene oxide (rGO) is used as a filler to accomplish percolated networks at very low filling ratios (<2 vol.%) in a semi-crystalline polymer matrix: poly(ethylene-co-butyl acrylate) (EBA). Various simulation models are used to predict the percolation threshold and the flake-to-flake distances, to complement the experimental results. A substantial increase in thermal stability of rGO is observed after surface modification, either by silanization or subsequent polymerizations. The non-linear DC resistivity of neat and silanized rGO and its trapping of charge-carriers in semi-crystalline EBA are demonstrated for the first time. It is shown that the polymer-grafted rGO improve the dispersibility in the EBA-matrix and that the graft length controls the inter-flake distances (i.e. charge-carrier hopping distances). By the appropriate selection of graft lengths, both highly resistive materials at 10 kV mm-1 and FGMs with a large and distinct drop in resistivity (six decades) are obtained, followed by saturation. The nonlinear drop in resistivity is attributed to narrow inter-flake distance distributions of grafted rGO.

Place, publisher, year, edition, pages
John Wiley & Sons , 2017. Vol. 38, no 16, article id 1700291
Keywords [en]
tuning of properties, non-linear resistivity, polymer-grafting, field-grading, rGO
National Category
Polymer Chemistry
Research subject
Fibre and Polymer Science
Identifiers
URN: urn:nbn:se:miun:diva-46933DOI: 10.1002/marc.201700291ISI: 000407849000013PubMedID: 28691386Scopus ID: 2-s2.0-85022346084OAI: oai:DiVA.org:miun-46933DiVA, id: diva2:1728948
Funder
SweGRIDS - Swedish Centre for Smart Grids and Energy Storage
Note

QC 20170323. QC 20191105

Available from: 2017-03-23 Created: 2023-01-19Bibliographically approved

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Wåhlander, MartinNilsson, FritjofAndersson, Richard L.Carlmark, AnnaMalmström, Eva
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