Journal
SURFACE & COATINGS TECHNOLOGY
Volume 205, Issue 8-9, Pages 2799-2805Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.surfcoat.2010.10.048
Keywords
Atmospheric pressure plasma jet; PET films; Plasma grafting; Acrylic acid inverse emulsion; Stability of free radicals
Funding
- National High Technology Research and Development Program of China [2007AA03Z101]
- Natural Science Foundation for the Youth [50803010, 60904056]
- Program of Introducing Talents of Discipline to Universities [B07024]
- Fundamental Research Funds for the Central Universities
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Surface-grafting polymerization of acrylic acid inverse emulsion on PET films is carried out using atmospheric pressure plasma jet (APPJ) preirradiation technique to improve their hydrophilicity. The effects of plasma treatment duration and the conditions of post-plasma-treatment storage of preirradiated films prior to grafting were studied. In general, an increased treatment time results in an increase in grafting ratio. A higher storage environmental relative humidity or a high storage temperature leads to faster free radical decay, reducing the graft efficiency. SEM results show an almost continuous grafted layer on the film surface when graft ratio reached 1.05%, and the corresponding water contact angle reaches 5 degrees. Hydrophobic recovery occurs for samples with a graft ratio of 0.12% owing to the surface reconstruction, while at higher graft ratios, the contact angle remains almost unchanged over one month's aging. (C) 2010 Elsevier B.V. All rights reserved.
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