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چکیده
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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.
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