A comparative evaluation o f some methods used in the calculation of free surface energy of activated polyethylene film
A comparative evaluation o f some methods used in the calculation of free surface energy
of activated polyethylene film
The angles of wetting with water and diiodomethane of films made of Polish-made low-density polyethylene activated by partial discharge of various intensity have been measured. On the basis of these measurements, the free surface energy and its dispersive and polar components for the activated samples of this film have been calculated with the use of the Fowkes, Owens, harmonic mean and harmonic-geometric mean methods. Essential differences in the results obtained by various methods have been observed. The biggest differences revealed the results obtained by the Fowkes methods; moreover, they also depend on the test liquid used in the determination of the wetting angle. The dependence of the evaluation and interpretation of changes taking place in the superficial layer of activated polyethylene films on the method used in calculating the free surface energy has been discussed.
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