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beginning of exposure, no peaks were observed in between 1650 cm-1 - 1720 cm-1. With the increase of exposure time, carbonyl stretching from both aromatic aldehyde and carboxylate group became predominant. Exposure for 90 s resulted in complete degradation of cyclic PPHA with a nearly overlapped spectrum with neat oPA monomer. Figure 22d shows the photographs of the degradation process of PPHA. The film started to degrade after 10 s exposure with liquid byproducts started forming on the surface. More liquid appeared on the film surface with the extent of exposure. Upon exposure for 90 s, the surface of the film completely degraded. Further exposure till 300 s resulted in the complete degradation of the film and form liquid byproducts that can be absorbed into the paper background. It is noteworthy that the degradation rate can be further tuned via changing ratio of PAG. 2.4.2 Triboelectric Property of PPHA TENG has been proven to be an effective tool in characterizing the triboelectric performance, or the ability of capturing surface charges during triboelectrification, of materials.12 To figure out the position of our PPHA film in the triboelectric series, six contact-separation-mode TENGs2, 17 made of PPHA and different commonly used triboelectric materials, including polyurethane (PU), nylon, polyethylene (PE), PET, Kapton and Teflon® FEP, were fabricated and their electrical outputs are summarized in Figure 23. It is noteworthy that the relative position of two materials in the triboelectric series only dictates the direction (signal sign), not the amount, of charge transfer during contact electrification, since the absolute value of TENG output is highly dependent on other factors such as film thickness and material composition as well.69, 71 As in Figure 23(a-c), the PU-PPHA TENG generated opposite electrical signals compared to others, 64PDF Image | HIGH PERFORMANCE TRIBOELECTRIC NANOGENERATOR AND ITS APPLICATIONS
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