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用IR光谱法测定聚碳酸亚丙酯样品中的环状小分子杂质碳酸亚丙酯。发现该杂质的质量分数与1/(A1180/A1250+1)呈线性关系 (A1180 和A1250 分别为波数1180cm-1 和1250cm-1 处的吸光度) ;标准偏差为0.011 ;回归系数为0.9992。该法用以代替 1HNMR法 ,可以较简单地给出可靠结果 ,满足常规测试的要求。
Determination of Cyclic Small Molecule Impurities in Poly (propylene carbonate) Samples by IR Spectroscopy. The mass fraction of this impurity was found to be linear with 1 / (A1180 / A1250 + 1) (A1180 and A1250 absorbance at wavenumbers 1180 and 1250 cm -1, respectively); the standard deviation was 0.011; and the regression coefficient was 0.9992. The method used instead of 1HNMR method, can be relatively simple to give reliable results, to meet the requirements of routine testing.