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Figure 22. Synthesis and degradation of transient polymer PPHA. (a) Cationic polymerization of cyclic PPHA. (b) Degradation mechanism of PPHA caused by photo- induced electron transfer reaction. (c) In-situ ATR-IR characterization of photo-induced degradation of PPHA. (d) Photographs of degradation of PPHA after irradiation under 365 nm UV for various periods of time. Attenuated total reflectance infrared spectroscopy (ATR-IR) was used to monitor the degradation process of cyclic PPHA film exposed for different length of time, shown in Figure 22c. The neat oPA monomer was investigated as well to find the expected spectrum of depolymerized product. The formation of carbonyl stretching from aromatic aldehyde is expected to be observed around 1670 cm-1. The small peak at around 1720 cm- 1 corresponded to the carbonyl stretching from carboxylate group from phthalic acid. The formation of phthalic acid was due to the oxidation of oPA after exposing to the humid air. Samples were exposed to an exposure source with an intensity of 4 mW/cm2. At the 63PDF Image | HIGH PERFORMANCE TRIBOELECTRIC NANOGENERATOR AND ITS APPLICATIONS
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