Optical Properties of Polypropylene upon Recycling

Figure 2

Optical images of the samples analyzed in this work: on the same row samples subjected to different recycling steps but solidified under cooling rates of the same order of magnitude are reported; on the same column samples having the same recycling history but solidified under different cooling rates are reported. All the images are on the same magnification scale; namely, the longest side is about 400 μm.