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      Combined XPS and contact angle studies of ethylene vinyl acetate and polyvinyl acetate blends

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      Author
      Ucar, I. O.
      Doganci, M. D.
      Cansoy, C. E.
      Erbil, H. Y.
      Avramova, I.
      Süzer, Şefik
      Date
      2011-09-01
      Source Title
      Applied Surface Science
      Print ISSN
      0169-4332
      Electronic ISSN
      1873-5584
      Publisher
      Elsevier
      Volume
      257
      Issue
      22
      Pages
      9587 - 9594
      Language
      English
      Type
      Article
      Item Usage Stats
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      Abstract
      In this study, we prepared thin films by blending ethylene vinyl acetate copolymers (EVA) containing 12-33 (wt.%) vinyl acetate (VA) with polyvinyl acetate (PVAc) and high density polyethylene homopolymers. Large area micropatterns having controlled protrusion sizes were obtained by phase-separation especially for the PVAc/EVA-33 blends using dip coating. These surfaces were characterized by XPS and contact angle measurements. A reasonably linear relation was found between the VA content on the surface (wt.%) obtained from XPS analysis and the VA content in bulk especially for PVAc/EVA-33 blend surfaces. PE segments were more enriched on the surface than that of the bulk for pure EVA copolymer surfaces similar to previous reports and VA enrichment was found on the EVA/HDPE blend surfaces due to high molecular weight of HDPE. Water theta(e) decreased with the increase in the VA content on the blend surface due to the polarity of VA. A good agreement was obtained between gamma(-)(s) and atomic oxygen surface concentration with the increase of VA content. The applicability of Cassie-Baxter equation was tested and found that it gave consistent results with the experimental water contact angles for the case where VA content was lower than 55 wt.% in the bulk composition. (C) 2011 Elsevier B. V. All rights reserved.
      Keywords
      Ethylene Vinyl Acetate Copolymers
      Polymer Blending
      Surface Free Energy
      XPS
      Contact Angle
      Polyolefin
      Permalink
      http://hdl.handle.net/11693/12106
      Published Version (Please cite this version)
      http://dx.doi.org/10.1016/j.apsusc.2011.06.070
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