Abstract
two-trace two-dimensional (2T2D) correlation mapping based on attenuated total reflection-Fourier transform infrared (ATR-FTIR) microscopic analysis was developed to visualize the initial stage of photodegradation behavior of polyethylene terephthalate (PET) films exposed to ultraviolet (UV) light. In addition, we applied matrix-assisted laser desorption ionization time-of-flight mass spectrometry (MALDI-TOFMS) to determine detailed structure of the photodegradation products observed the 2T2D mapping. The generation of carboxyl groups as degradation products at the surface layer of the PET film was probed using the characterization techniques. The cross-section of the PET films was analyzed to evaluate the progression of the photodegradation by UV-irradiation for 0–16 h. The content of the photodegradation product was consistently increased with prolonging the UV-irradiation time, while, the depth of degradation by UV-irradiation for 1 h was estimated to be 1.3 μm, which did not change significantly even increasing the UV-irradiation time to 16 h. The developed characterization technique is a potentially valuable tool in probing the initial stage of the photodegradation behavior of polymers.
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