High-density polyethylene functionalized by cold plasma and silanes

High-density polyethylene (HDPE) surface was modified by radio-frequency discharge plasma and subsequently grafted by alkoxy silane to form a new surface containing polar functional groups. Reaction of the polar groups with vinyl silanes significantly improved hydrophilicity of the polymer. The decr...

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Bibliographic Details
Published in:Vacuum 2012-07, Vol.86 (12), p.2089-2094
Main Authors: Novák, I., Popelka, A., Krupa, I., Chodák, I., Janigová, I., Nedelčev, T., Špírková, M., Kleinová, A.
Format: Article
Language:English
Subjects:
Adhesion
Adhesive joints
AFM
ATR-FTIR
Cold plasmas
Discharge
Grafting
Peel strength
Polyethylene
Polyethylenes
Radio-frequency plasma
Silanes
Surface energy
Surface roughness
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Summary:High-density polyethylene (HDPE) surface was modified by radio-frequency discharge plasma and subsequently grafted by alkoxy silane to form a new surface containing polar functional groups. Reaction of the polar groups with vinyl silanes significantly improved hydrophilicity of the polymer. The decrease of surface energy of polymer modified by plasma in the course of ageing was stabilized by silane grafting. The changes in chemical structure of the polymer were analyzed by ATR-FTIR spectroscopy, surface roughness was studied using AFM. The surface energy, and its polar contribution of plasma modified HDPE increased, as well as peel strengths of adhesive joints to polyacrylate. ▸ HDPE modified by RF plasma and by alkoxy silane. ▸ Significantly improved hydrophilicity of polymer. ▸ DSC confirmed crystallinity decrease of HDPE modified by RF plasma. ▸ Ageing stabilized by silane grafting.
ISSN:0042-207X
1879-2715
DOI:10.1016/j.vacuum.2012.04.046