We have measured the surface wettability of poly(ethylene terephthalate) (PET) film drawn to different draw ratios at strain rates of 0.56 and 0.01 s 1 and a draw temperature of 90°C. The probe liquid was demineralized water. We believe that the observed changes in advancing and receding work of adhesion--and in the wetting hysteresis indicated by their difference--reflect a lowering of the energy state of the film surface during drawing, due to increases in 'amorphous orientation' and the onset of crystallization. Orientation-induced interaction between PET molecules may reduce the availability of sites that would otherwise interact with water.
Посилання на статтю:
Influence of microstructure developed during drawing on surface properties of poly(ethylene terephthalate) film / F. Hermanutz*, D. R. Salem and S. P. Wesson // Polymer. – 1994. – Vol 35. – P. 4611-4617.