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2 Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology

2 2012

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Surface properties of polyethylene pre-treated by low-temperature plasma

Novák I., Popelka A., Sedliačik J., Valentín M., Chodák I., Kleinová A., Vanko V., Preťo J.

Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology

2012

No. 79

67--74

Low-density polyethylene (LDPE) modified by atmospheric dielectric surface barrier discharge plasma in oxygen was investigated to improve surface properties and adhesion of LDPE to more polar polymers. The process of plasma modification was investigated using several methods ‒ surface energy measurements, Fourier Transform Infrared Spectroscopy with Attenuated Total Reflectance (FTIR-ATR). The surface energy of LDPE increased significantly after activation by oxygen barrier plasma even at very short time of modification. The FTIR-ATR spectra manifested the presence of carbonyl functional groups on the surface of polymer pre-treated by oxygen barrier plasma. The surface energy of treated LDPE diminished in the course of ageing especially during the first 10 days after modification by barrier plasma.

Modification of polyethylene by radio-frequency plasma and silanes

Novák I., Popelka A., Krupa I., Chodák I., Sedliačik J., Valentín M., Kleinová A., Jurkovič P.

Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology

2012

No. 79

75--83

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.