Recently I've been learning about the photoelectric effect in my physics classes.
I only have a rudimentary understanding of chemistry, but I've been wondering what the connection is between the photoelectric effect and UV degredation.
For the sake of simplicity let's focus on the degredation of polypropylene.
My hypothesis is, that the UV light frees some electrons from the material. These will either weaken or break the bond between two molecules or atoms in the molecule itself. I would ultimately except the molecule chains to be broken into smaller pieces due to this.
Is that a reasonable assumption or does the process work completely different?