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Hydrophobic recover...
Hydrophobic recovery of polydimethylsiloxane after exposure to partial discharges as a function of crosslink density
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Hillborg, H. (författare)
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Sandelin, M. (författare)
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- Gedde, Ulf W. (författare)
- KTH,Polymerteknologi
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(creator_code:org_t)
- 2001
- 2001
- Engelska.
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Ingår i: Polymer. - 0032-3861 .- 1873-2291. ; 42:17, s. 7349-7362
- Relaterad länk:
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https://urn.kb.se/re...
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visa fler...
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https://doi.org/10.1...
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visa färre...
Abstract
Ämnesord
Stäng
- Polydimethylsiloxanes with different crosslink densities were exposed to corona discharges or GHz air plasma and studied by contact angle measurements, X-ray photoelectron spectroscopy, optical microscopy, scanning electron microscopy and atomic force microscopy. The degree of surface oxidation increased with increasing exposure time with a limiting depth of 100-150 nm. Surface oxidation was faster in more highly crosslinked polymers. Within the oxidised layer, a brittle, microporous silica-like layer with a minimum organic silicone content of 40% gradually developed with increasing exposure time. The strain at which the silica-like layer cracked decreased with increasing dose of corona or air plasma. The hydrophobic recovery following the corona/air plasma exposure occurred at a slow rate by diffusion of oligomers through the microporous but uncracked silica-like layer or at a much higher rate by transport of oligomers through cracks in the silica-like layer.
Nyckelord
- polydimethylsiloxane
- electrical discharges
- hydrophobicity
- epdm composite insulators
- naturally aged silicone
- surface
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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