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More fluorous surface modifier makes it less oleophobic: fluorinated siloxane copolymer/PDMS coatings

Zhang, Wei ; Zheng, Ying ; Orsini, Lorenzo ; Morelli, Andrea ; Galli, Giancarlo ; Chiellini, Emo ; Carpenter, Everett E ; Wynne, Kenneth J

Langmuir : the ACS journal of surfaces and colloids, 20 April 2010, Vol.26(8), pp.5848-55 [Rivista Peer Reviewed]

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  • Titolo:
    More fluorous surface modifier makes it less oleophobic: fluorinated siloxane copolymer/PDMS coatings
  • Autore: Zhang, Wei ; Zheng, Ying ; Orsini, Lorenzo ; Morelli, Andrea ; Galli, Giancarlo ; Chiellini, Emo ; Carpenter, Everett E ; Wynne, Kenneth J
  • Note di contenuto: A copolyacrylate with semifluorinated and polydimethylsiloxane side chains (D5-3) was used as a surface modifier for a condensation-cured PDMS coating. The decyl fluorous group is represented by "D"; "5" is a 5 kDa silicone, and "3" is the mole ratio of fluorous to silicone side chains. Wetting behavior was assessed by dynamic contact angle (DCA) analysis using isopropanol, which differentiates silicone and fluorous wetting behavior. Interestingly, a maximum in surface oleophobicity was found at low D5-3 concentration (0.4 wt %). Higher concentrations result in decreased oleophobicity, as reflected in decreased contact angles. To understand this unexpected observation, dynamic light scattering (DLS) studies were initiated on a model system consisting of hydroxyl-terminated PDMS (18 kDa) containing varying amounts of D5-3. DLS revealed D5-3 aggregation to be a function of temperature and concentration. A model is proposed by which D5-3 surface concentration is depleted via phase separation...
  • Fa parte di: Langmuir : the ACS journal of surfaces and colloids, 20 April 2010, Vol.26(8), pp.5848-55
  • Soggetti: Dimethylpolysiloxanes -- Chemistry ; Fluorocarbon Polymers -- Chemistry ; Polymers -- Chemistry
  • Lingua: Inglese
  • Tipo: Articolo
  • Identificativo: E-ISSN: 1520-5827 ; PMID: 20000339 Version:1 ; DOI: 10.1021/la903770s

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