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Poly(ethylene oxide...
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Saigal, TrishnaCarnegie Mellon University, USA
(författare)
Poly(ethylene oxide) star polymer adsorption at the silica/aqueous interface and displacement by linear poly(ethylene oxide)
- Artikel/kapitelEngelska2013
Förlag, utgivningsår, omfång ...
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2013-03-12
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American Chemical Society (ACS),2013
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printrdacarrier
Nummerbeteckningar
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LIBRIS-ID:oai:DiVA.org:ri-27094
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https://urn.kb.se/resolve?urn=urn:nbn:se:ri:diva-27094URI
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https://doi.org/10.1021/la305085aDOI
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https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-122348URI
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Språk:engelska
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Sammanfattning på:engelska
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Klassifikation
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Ämneskategori:ref swepub-contenttype
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Ämneskategori:art swepub-publicationtype
Anmärkningar
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A3200
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QC 20130522
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Multiarm star copolymers with approximately 460 poly(ethylene oxide) (PEO) arms that have a degree of polymerization N = 45 were synthesized via atom transfer radical polymerization (ATRP) of PEO-methacrylate macromonomers in the presence of divinyl benzene cross-linkers. These are an example of molecular or nanoparticulate brushes that are of interest as steric stabilizers or boundary lubrication agents when adsorbed from solution to a solid/aqueous interface. We use ellipsometry to measure adsorption isotherms at the silica/aqueous interface for PEO star polymers and linear PEO chains having molecular weights comparable either to the star polymer or to the individual arms. The compactness of the PEO star polymers (molecular weight 1.2 × 106) yields a saturation surface excess concentration that is approximately 3.5 times greater than that of the high molecular weight (1 × 106) linear PEO. Adsorption of low molecular weight (6000) linear PEO was below the detection limit. Competitive adsorption experiments were conducted with ellipsometry, complemented by independent quartz crystal microbalance with dissipation (QCM-D) measurements. Linear PEO (high molecular weight) displaced preadsorbed PEO star polymers over the course of approximately 1.5 h, to form a mixed adsorbed layer having not only a significantly lower overall polymer surface excess concentration, but also a significantly greater amount of hydrodynamically entrapped water. Challenging a preadsorbed linear PEO (high molecular weight) layer with PEO star polymers produced no measurable change in the overall polymer surface excess concentration, but changes in the QCM-D energy dissipation and resonance frequency suggested that the introduction of PEO star polymers caused a slight swelling of the layer with a correspondingly small increase in entrapped water content.
Ämnesord och genrebeteckningar
Biuppslag (personer, institutioner, konferenser, titlar ...)
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Riley, John K.Carnegie Mellon University, USA
(författare)
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Golas, Patricia LynnCarnegie Mellon University, USA
(författare)
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Bodvik, RasmusKTH,Yt- och korrosionsvetenskap(Swepub:kth)u1jxb5lh
(författare)
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Claesson, Per MartinKTH,RISE,SP Kemi Material och Ytor,KTH Royal Institute of Technology, Sweden,Yt- och korrosionsvetenskap(Swepub:kth)u15tzvsb
(författare)
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Matyjaszewski, KrzysztofCarnegie Mellon University, USA
(författare)
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Tilton, Robert D.Carnegie Mellon University, USA
(författare)
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Carnegie Mellon University, USAYt- och korrosionsvetenskap
(creator_code:org_t)
Sammanhörande titlar
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Ingår i:Langmuir: American Chemical Society (ACS)29:12, s. 3999-40070743-74631520-5827
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