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Influence of electron radiation on surface free energy of low density polyethylene film

Żenkiewicz M.

Journal of Achievements in Materials and Manufacturing Engineering

2007

Vol. 25, nr 2

43-46

Purpose: of this paper is to study the effect of the electron radiation, generated in a high voltage accelerator, on surface free energy (SFE) of low density polyethylene film. Design/methodology/approach: An LAE 13/9 linear accelerator (former USSR) was used to irradiate the examined polyethylene film. The maximum electron energy was 13 MeV, controllable energy range, 5-13 MeV, and average power of the electron beam, 9 kW. The contact angles were measured with a G 11 goniometer (Krüss GmbH, Germany) using doubly distilled water, glycerol, formamide, diiodomethane, and alpha bromonaphthalene. The calculations of SFE were done by means of the Owens Wendt or the van Oss-haudhury-Good methods. Findings: The value of the SFE for the polyethylene film, increasing monotonically with the radiation dose, depends on both the applied method of calculation and the set of measuring liquids. The differences between the results obtained with these two methods and sets of liquids generally increase with the radiation dose. Research limitations/implications: The SFE value of polyethylene film depends not only on the intermolecular interactions originating in several outer atomic layers of the film but also on the intermolecular interactions occurring in the measuring liquids and on the way of performing investigations. Thus, it may be compared only when determined with the same method and using the same measuring liquids. Practical implications: The results of presented research allow determining the recommendations referring to the optimization of irradiation technology of low density polyethylene film. Originality/value: The differences in the SFE values calculated with the Owens Wendt and the van Oss Chaudhury-Good methods depend not on only on the kind of the calculation method but also on the kind of measuring liquid used in contact angle measurement.