For example, light tends to scatter as it crosses the boundaries
between crystallites and the amorphous regions in PET. This
scattering means that crystalline PET is opaque and white in
most cases.
• The decrease in crystallinity produces more transparent.
• An amorphous homogeneous PS will have little or no
scattering power and will be transparent.
• A highly crystalline polymer, HDPE, will be most opaque