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Superhydrophobic self-regenerative silicone rubber nanocomposites for electrical outdoor insulation
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology, Fibre Technology.
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Fibre- and Polymer Technology.ORCID iD: 0000-0002-2139-7460
2015 (English)In: ICCM International Conferences on Composite Materials, International Committee on Composite Materials , 2015Conference paper, Published paper (Refereed)
Abstract [en]

The overall objective of this project is to develop new structural composite materials for high voltage outdoor insulation applications using silicone rubber (PDMS) coated with micro- and nanoparticles. The goal is to obtain hierarchical superhydrophobic surfaces, with antifogging, antifouling and self-cleaning ability. This will minimize surface leakage currents and subsequent surface flash over of the insulator. In order to achieve both the superhydrophobic and self-cleaning ability, a combination of different surface chemistry of the particles has been investigated. Three different deposition techniques, including spraying of ROD ultrasonicated ZnO suspensions were investigated. Pure silicone rubber (SYLGARD® 184) was coated with hydrophobic and hydrophilic inorganic micro- and nanoparticles (ZnO). The effect of the different factors, such as particle surface chemistry and the deposition method, on the hydrophobicity of the surface has been investigated using static and dynamic contact angle measurements. The objective has been to achieve the highest static contact angle combined with the lowest possible hysteresis. The results showed that the spraying method was more suitable when using PDMS as matrix. The link between superhydrophobicity and the surface structure has been assessed by Scanning Electron Microscopy. The next step towards a self-regenerative composite material is approached by the incorporation of the optimal functionalised nanoparticles into the bulk material. The dynamic behaviour of silicone rubber presents a challenge for the stability of micro- and nanocomposites. Different mechanical techniques and methods of integration are being investigated for improvement of the homogeneity of the composites. Preliminary studies have been performed evaluating the effect of the curing time of the PDMS on the degree of incorporation of the nanoparticles in the surface and uniformity within the bulk. The behaviour of the nanocomposite and the evolution of the different properties with time and environmental conditions will be studied in the next phase of the project. 

Place, publisher, year, edition, pages
International Committee on Composite Materials , 2015.
Keywords [en]
Nanocomposites, PDMS, Self-regenerative, Superhydrophobic, ZnO
National Category
Polymer Technologies
Identifiers
URN: urn:nbn:se:kth:diva-236918Scopus ID: 2-s2.0-85053104760OAI: oai:DiVA.org:kth-236918DiVA, id: diva2:1269841
Conference
20th International Conference on Composite Materials, ICCM 2015, 19 July 2015 through 24 July 2015
Funder
Swedish Energy Agency
Note

Funding text: Financial support given by Energimyndigheten, Elforsk and ABB Corporate Research Center through the Elektra program is gratefully acknowledged.

QC 20181211

Available from: 2018-12-11 Created: 2018-12-11 Last updated: 2018-12-11Bibliographically approved

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Mendoza, AnaStrömberg, Emma

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