Cover Image, Volume 49, Issue 9


original image

The front cover shows a polarized light image of low density polyethylene between crossed-polars; the colors and the Maltese cross provide information about the orientation and stress frozen into the structure by processing. On page 621 of this issue, Oleksandr Mykhaylyk and colleagues use polarized light imaging and small-angle X-ray scattering to study the effects of molecular architecture and flow during processing on the evolution of structure in bimodal blends of polyolefins. Their approach allows them to make the bridge in understanding from model materials in the lab to the industrial artifacts found in polydisperse polymer materials on supermarket shelves.