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T. Garbacz

Effect of selected auxiliary agents on the properties of surface layer of extruded polyethylene

Polimery 2004, No 1, 23



DOI: dx.doi.org/10.14314/polimery.2004.023


Summary

The effect of modification of medium density polyethylene (PE-MD), widely used for optotelecommunication cables coatings, with selected auxiliary agents on the properties of surface layer of stampings has been investigated. Blowing agent (SP) and antistatic agent (SA) were used as modifiers. Wetting angle (Θ) and free surface energy (γs) were determined by Owens-Wendt's method. Significant effects of SP and SA contents on the properties investigated were observed. It was found that γs decreases monotonically and nonlinearly with increasing SA content what meets wettability decrease. On the contrary, an increase in SP content causes increase in γs so also wettability increase. Adsorbed SA quantity does not increase linearly with an increase in its content in PE-MD but slowly asymptotically approaches the limiting saturation. Additionally, on the basis of γs mean values, the systems of regression equations, describing the dependences between gs and SA or SP contents, were determined.


Keywords: medium density polyethylene, blowing agent, antistatic agent, surface layer, free surface energy, wettability


T. Garbacz

Effect of selected auxiliary agents on the properties of surface layer of extruded polyethylene