聚偏氟乙烯共辐射接枝N-乙烯基吡咯烷酮的红外光谱分析

FTIR characterization of PVDF powder grafted with N-vinylpyrrolidone(NVP) by simultaneous irradiation method

对聚偏氟乙烯(PVDF)、PVP、各种比例的PVDF/PVP共混物,以及通过共辐射接枝得到的多种接枝率的PVDF-g-PVP接枝共聚物进行了红外光谱测定。与称重法得到的结果相比较,发现利用红外光谱可以较好地得到样品中PVP含量的定量结果。研究发现,在共辐照条件下,吸收剂量低于26kGy的辐照对PVDF的红外光谱基本无影响。与PVP含量相等的其混物相比,接枝共聚物中PVP特有的C=O吸收峰的强度明显较低,说明不能简单地通过共混方法,通过红外光谱与PVP含量的定量关系,推断PVDF-g-PVP接枝共聚物中的接枝率。

PVDF, PVP, PVDF/PVP with different blend ratios and PVDF-g-PVP graft copolymer with different grafting degree were characterized by Fourier transform infrared （FTIR）. As indicated by the corresponding relationship of gravimetric analysis, FTIR is feasible for the quantitative determination of PVP in the samples. It is found that when the absorbed dose was below 26 kGy, the irradiation had little influence on the spectra of PVDF. But compared to the blend with the same content of PVP, the intensity of the special carbonyl （C=O） stretching absorption of PVP in graft copolymer significantly decreases, which suggests that the grafting degree of graft copolymer can not be obtained by the quantitative relational expression from the blending method.