Since this is a topic related to storage media you might want to use Polycarbonate in most of your examples

How does the average molecular weight changes the property of Polymer?? (Birefrigence, hardness, transparancy of light at different wavelength)
Different polymer 的吸水性 and changes in its property when water is absrobed.
What may cause a change in the optical or magnitical quality of polymer?
(for example 起霧)
Stablility under various conditions (high T, acidic vapor, UV/EUV exposure)

How much pollution the standard industrial process makes when producing each polymer?

thanks....