Abstract
The effect of shear modification and blending on the coating performance of a commercial LDPE resin was studied. Shear modification of the virgin resin as well as of its blends with another LDPE was performed in single- and twin-screw extruders. The rheological properties of the modified materials were measured, and no significant differences in their behavior under shear deformation were detected. On the other hand, changes in the entrance pressure drop and extensional viscosity were observed. These changes in extensional behavior were found to affect coating properties. Overall, neck-in improved through shear modification, whereas it was not sensitive to blending with a higher-molecular-weight resin. On the other hand, blending had an effect on the draw-down speed, and it can be used to achieve a balanced coating performance.
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