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用本体聚合合成了一系列不同组分比的丙烯腈-醋酸乙烯酯共聚物[以下简称P(AN+VAc)]样品。通过P(AN+VAc)与PAN和PVAc混合物红外光谱进行比较,发现共聚物红外光谱中的一些谱带发生明显变化,并对此进行了解释。 通过羰基伸缩振动谱带(1740厘米~(-1))和腈基伸缩振动谱带(2240厘米~(-1))吸光度比,可定量P(AN+VAc)的组分比,在比较大的组分变化范围内,测量误差小于3％。同时,通过测量腈基谱带波数的位移来计算共聚物P(AN+VAc)的序列分布,测量误差小于3％。
A series of acrylonitrile-vinyl acetate copolymers [P (AN + VAc)] with different composition ratios were synthesized by bulk polymerization. Comparing P (AN + VAc) spectra with PAN and PVAc mixtures, some bands in the infrared spectra of the copolymers were found to change significantly, and this is explained. The component ratio of P (AN + VAc) can be quantified by the absorbance ratio of the carbonyl stretching vibration band (1740 cm -1) and the nitrile stretching vibration band (2240 cm -1) Within the variation range of components, the measurement error is less than 3%. Meanwhile, the sequence distribution of the copolymer P (AN + VAc) was calculated by measuring the shift of the wave number of the nitrile band with a measurement error of less than 3%.