Ultraviolet (UV) exposure tests were carried out in a QU-V chamber containing eight UV-B lamps–313 nm, (Q-lab Corp, Westlake, CA, USA). The exposure cycle conditions were 8 h of light at T = 55 °C followed by 4 h condensation at T = 35 °C. The progress of photodegradation was followed by FTIR spectroscopy.
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