Abstract
Statistically designed blown film experiments were conducted to investigate the effects of molecular weight distribution and processing conditions on film properties of three linear low-density polyethylenes in term of their rheological characteristics. The complex interactions between molecular and processing parameters to film properties can be understood rheologically by relating the ratio of polymer largest molecular relaxation time, τmax, to a process time, tp. When represented in term of the rescaled processing time, τmax/tp, namely as Deborah Number (De), a master curve is obtained for the physical properties of these films blown under similar processing condition, while the variations of processing conditions on film properties can be characterised by families of De master-curves. The influence of complex thermo-mechanical deformation history on crystallisation during blown film processing can be highlighted with complementary pre-shear flow stress relaxation and flow-induced crystallisation experiments by Small Angle Light Scattering patterns.
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