FIGURE 6. FTIR spectra of PAN, PVC, PVP and Chitosan Powder.

Figure 6 shows the FTIR absorption spectra of PVP powder only without any inclusions. The vibration characteristics of the PVP powder resemble with the nitrile group图6展示了纯PVP（Polyvinylpyrrolidone，聚乙烯吡咯烷酮）粉末的傅里叶变换红外吸收光谱（Fourier Transform Infrared Spectroscopy，FTIR），该粉末未掺杂任何其他组分。该PVP粉末的振动特征与腈基（nitrile group）的振动特征相近。