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3. Results and Discussion 3.1. Microstructure and Surface Morphology The FT-IR spectra of different PCBs are shown in Figure 3. It can be observed that the IR peak at 3440 cm−1 was caused by the –OH stretching vibration of PTX in the drug coating, and the peak at 2945 cm−1 was caused by the –OH vibration in the –COOH. The peaks of the four PCBs were weakened when compared to PTX due to the addition of D-tartaric acid.
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