علی یادگاری

Linear low density polyethylene (LLDPE) cast stretch films were produced to evaluate the effects of line speed, air gap, frost line and film thickness on the morphology of the prepared films. Surface morphology of the films were observed using scanning electron microscopy (SEM). It was found that the most effective parameter on the surface morphology of the films is line speed followed by air gap. In addition, relaxation behavior of LLDPE resins was investigated using rheological measurements. For the films with similar thicknesses but prepared at different line speeds the time scale for the melt to relax was correlated with the crystal phase development in the films, which affected the microstructure and crystalline morphology of the films.