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展示了不含任何掺杂的纯聚乙烯吡咯烷酮（PVP）粉末的傅里叶变换红外（FTIR）吸收光谱。该PVP粉末的振动特征与腈基相似。